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Journal Cover Journal of Applied Ichthyology
  [SJR: 0.51]   [H-I: 44]   [6 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0175-8659 - ISSN (Online) 1439-0426
   Published by John Wiley and Sons Homepage  [1597 journals]
  • Exotic sturgeons in the Vistula Lagoon in 2011, their occurrence, diet and
           parasites, with notes on the fishery background
    • Authors: M. E. Skóra; E. Bogacka-Kapusta, J. Morzuch, M. Kulikowski, L. Rolbiecki, K. Kozłowski, A. Kapusta
      Pages: 33 - 38
      Abstract: The Siberian sturgeon Acipenser baerii and the sterlet Acipenser ruthenus were recorded for the first time in the Vistula Lagoon in 2011. Among 66 sturgeons collected between April and December 2011, the Siberian sturgeon was the most numerous species (77%); however, a significant seasonal variability was observed, with sterlet dominating in the catches in late autumn of the same year. The stomach contents of the two species differed widely: Siberian sturgeon (14.9–42.2 cm standard length, SL) fed on crustaceans (Cercopagis pengoi, Oithona sp., Neomysis integer) (10.7% IRI), larvae and pupas of insects (Chaoborus sp., Chironomus sp., Polypedilum sp., Procladius sp., Culex sp.) (88.9% IRI) and fishes (Neogobius melanostomus, Osmerus eperlanus) (0.5% IRI), whereas sterlet (24.0–34.4 cm SL) consumed crustaceans (N. integer) (64.3% IRI), larvae of insects (Chironomus sp., Polypedilum sp.) (20.3% IRI) and fish (N. melanostomus) (15.4% IRI). Single Siberian sturgeon (4.3%) were found to harbour the parasitic nematode (Raphidascaris acus).
      PubDate: 2018-01-13T02:19:51.879016-05:
      DOI: 10.1111/jai.13577
  • Fisheries assessment of Chwaka Bay (Zanzibar) – following a holistic
    • Authors: J. Rehren; M. Wolff, N. Jiddawi
      Pages: 117 - 128
      Abstract: This study investigates the typical East African multispecies fishery of Chwaka Bay (Zanzibar) by assessing growth, mortality, exploitation and stock size of six key target species of the fishery. Analyses are based on monthly length–frequency data collected from January to June and September to December in 2014 from the three main landing sites surrounding the bay. Estimated von Bertalanffy growth parameters using the ELEFAN I routine as implemented in FiSAT II varied among species from 27.6 to 64.4 cm (L∞) and 0.24 to 0.8 per year (K). Current exploitation rates compared to biological reference points calculated from yield-per-recruit analysis for five of the six key species indicate that Siganus sutor, Lethrinus borbonicus and Lethrinus lentjan are harvested beyond maximum sustainable levels (Emax). While juvenile retention rates of these three species are>80% and current Lc-values are lower than Lopt, fishing mortalities for Siganus sutor and Lethrinus borbonicus are highest for specimens above length at first maturity. Two management measures are discussed: (i) an increase in mesh size; and (ii) closure of the destructive dragnet fishery. The first option seems feasible only if the radius of the fishery were increased to capture larger specimens outside the shallow bay area. The second option would leave approximately 550 fishermen unemployed. Reallocating dragnet fishing effort to other gears would lead to a substantial increase in the number of boats, which might create use conflicts over the limited fishing area. The general status of the fishery in Chwaka Bay is considered as representing a ‘full exploitation to over-exploitation scenario’, with no scope for expansion.
      PubDate: 2018-01-13T02:19:52.658427-05:
      DOI: 10.1111/jai.13578
  • Length-weight relationships of nine fish species from the upper reach of
           the Gan River, a tributary of the Yangtze River in China
    • Authors: R. Wang; X. Qu, F. Xiong, C. Guo, W. Xin, Y. Chen
      Abstract: Length-weight relationships (LWRs) are reported for nine fish species belonging to four families from the upper reach of the Gan River, one of the main tributaries of the Yangtze River, China. A total of 807 specimens were collected from April 2016 to July 2017. Fishes were both sampled using a backpack electrofishing unit and collected from local fish markets that using various fishing gears such as electrofishing boats, gillnets (mesh sizes: 1–12 cm), hooks, and benthic fyke nets (mesh sizes: 0.5 cm and 0.7 cm). The fish species were Siniperca undulata (Fang & Chong, 1932), Pseudogobio vaillanti (Sauvage, 1878), Sarcocheilichthys parvus (Nichols, 1930), Barbodes semifasciolatus (Günther, 1868), Spinibarbus hollandi (Oshima, 1919), Gobiobotia meridionalis (Chen & Cao, 1977), Pseudobagrus albomarginatus (Rendahl, 1928), Pseudogastromyzon changtingensis (Liang, 1942), and Pseudogastromyzon fangi (Nichols, 1931). The a values for the nine species varied between 0.0056 and 0.0366, the b values ranged from 2.333 to 3.318, and r2 values from .952 to .994.
      PubDate: 2017-12-05T00:25:49.230742-05:
      DOI: 10.1111/jai.13549
  • Age, growth, and age at sexual maturity of the commercially landed skate
           species, Dipturus chinensis (Basilewsky, 1855), in the northern East China
    • Authors: K. Hara; K. Furumitsu, T. Aoshima, H. Kanehara, A. Yamaguchi
      Abstract: Age, growth, and age at sexual maturity of the polkadot skate Dipturus chinensis, in the northern East China Sea were determined for a total of 614 specimens collected from April 2009 to December 2014. Vertebral centrum analysis was used to calculate the age of the skates. Annual band deposition was determined by marginal increment analysis. The von Bertalanffy growth model was fitted to the observed length-at-age data for each sex (males, L∞ = 76.8, k = 0.109, t0 = −1.28; females, L∞ = 83.1, k = 0.103, t0 = −1.20). Growth patterns of females and males were similar until the age of 6; thereafter, females grew larger than males. Maximum age recorded was 13 years for males and 15 years for females. Age at 50% sexual maturity was 8.22 years for males and 9.39 years for females. These results indicate that D. chinensis is slow growing, relatively long-lived, and late maturing, and therefore vulnerable to exploitation.
      PubDate: 2017-12-01T23:35:46.148326-05:
      DOI: 10.1111/jai.13575
  • Comparison of growth performance, biochemical and fatty acid compositions
           between all-female diploid and triploid rainbow trout Oncorhynchus mykiss
           (Walbaum, 1792)
    • Authors: İ. Karayucel; A. Parlak Akyüz, S. Dernekbaşı
      Abstract: This study compares the performance (in terms of survival and growth), biochemical and fatty acid compositions among all female diploid (AFD) and triploid (AFT) rainbow trout (Oncorhynchus mykiss). AFD and AFT fish with mean initial weights of 1,040.1 ± 1.3 and 1,039.7 ± 1.6 g, respectively, were reared and fed from March to August with a commercially extruded trout feed in a commercial freshwater fishfarm located in the Black Sea region (Samsun, Turkey). Survival was reduced throughout the experimental period in the AFT group with increasing water temperatures. At the end of the experiment, survival rates were 98.57 ± 1.43% and 82.38 ± 7.39% for the AFD and AFT groups, respectively. The AFD group showed significantly better growth performances in terms of weight gain, feed conversion rate (FCR), relative growth rate (RGR) and specific growth rate (SGR) than the AFT group (p 
      PubDate: 2017-12-01T23:35:27.039775-05:
      DOI: 10.1111/jai.13579
  • Length-weight relationship of ten indigenous freshwater fish species from
           Gandak River, Bihar, India
    • Authors: Raju Baitha; Archana Sinha, Satish Kumar Koushlesh, Thangjam Nirupada Chanu, Kavita Kumari, Pranab Gogoi, Mitesh Haridas Ramteke, Simanku Borah, Basanta Kumar Das
      Abstract: Ten indigenous freshwater fish species belonging to nine genera and seven families were collected from Gandak River, Bihar, India during December, 2014 to September, 2016. Fishes were caught using Cast nets, Gill nets, Drag nets with mesh size of 15–20 mm, 25–30 mm and 5–10 mm respectively along with Traps. Sampling was done during dry and wet seasons and a total of 682 fish were collected for analysis of their Length–Weight Relationships (LWRs). Analyses included seven species for which no previous LWRs information were available in FishBase, and new maximum lengths were recorded for three species.
      PubDate: 2017-12-01T23:35:24.521686-05:
      DOI: 10.1111/jai.13555
  • Characterization of 27 novel microsatellite loci in Sinibotia
           superciliaris (Günther 1892) and cross-species transferability in
           Sinibotia reevesae (Chang 1944)
    • Authors: Y. Wang; S. Liu, Z. Peng, B. Xie
      Abstract: The Chinese golden loach, Sinibotia superciliaris and its congener Sinibotia reevesae, are endemic to China and extraordinary similar in morphological traits. However, few genetic studies have been conducted on them, especially those based on nuclear markers. Here, we developed 27 novel polymorphic microsatellite markers from S. superciliaris and further tested the cross-species transferability of those loci in S. reevesae. The cross-species amplification test showed that 19 loci demonstrate polymorphism in S. reevesae. The mean number of alleles (NA) were both 3 in S. superciliaris and S. reevesae, the mean expected heterozygosities (HE) were 0.57 and 0.54, the Shannon-Wiener Diversity Indices (SW) were 0.84 and 0.82, and the evenness (E) were 0.09 and 0.08, respectively. The polymorphic information content (PIC) showed a high level of polymorphism for the two species (mean 0.54 and 0.50, respectively). In addition, the cross-species transferability (100%) of those markers was clearly high, which confirmed that the microsatellite markers developed here could be used effectively for other related species.
      PubDate: 2017-12-01T06:01:07.199121-05:
      DOI: 10.1111/jai.13539
  • Length-weight relationships of six fishes from the Anning River, China
    • Authors: H. J. Ru; Y. Zhang, Y. F. Li, X. X. Wu, Z. H. Ni
      Abstract: This paper provides the length–weight relationships for six fish species collected from the Anning River, one of the biggest tributaries of the Yalong River in China. A total of 1096 specimens belonging to six fish species were analyzed. Among them, the length–weight relationships for 4 fish species are first-time reports for FishBase and new maximum lengths of one fish species is also reported.
      PubDate: 2017-12-01T06:01:05.172522-05:
      DOI: 10.1111/jai.13437
  • Use of non-island, shallow nearshore beach environments by Gulf Sturgeon
           (Acipenser oxyrinchus desotoi) within the Mississippi Sound, USA
    • Authors: M. S. Peterson; W. T. Slack, P. O. Grammer, J.-M. Havrylkoff
      Pages: 3 - 11
      Abstract: Large sub-adult/adult western population Gulf Sturgeon move to barrier islands in winter to feed whereas eastern fish move offshore or to nearshore non-island environments; most small sub-adults/juveniles remain in the estuarine system during winter. To test this, we used an acoustic data set deployed around the Port of Gulfport (hereafter Port footprint, east gate, west gate) within Mississippi Sound. We documented between three and six fish on each receiver totaling 12,285 detections for all 19 receivers between September 2012–May 2013. Only 30% of fish had both a high number of overall detections and a high number of detection days. In contrast, from October 2013–May 2014, between three and nine fish were detected on each receiver but with only 2,371 detections. Five fish (29.4%) had a high number of detections but a reduced number of detection days in the acoustic array; all fish appeared to be transients. Adults, unexpectedly, had the most prevalent occurrence and number of detection days in these shallow, non-island beach environments contrary to our initial hypothesis. Our data suggests annually variable, regional-scale use of beach environments not associated with barrier islands that likely serve as a travel corridor between drainages/offshore barrier islands, or as feeding zones; these movements may enhance the potential for mortality in Mississippi Sound.
      PubDate: 2017-11-06T02:54:44.838728-05:
      DOI: 10.1111/jai.13532
  • Habitat associations of shovelnose sturgeon Scaphirhynchus platorynchus
           (Rafinesque, 1820) in the lower Platte River, Nebraska
    • Authors: J. J. Hammen; M. J. Hamel, M. L. Rugg, M. A. Pegg
      Pages: 12 - 20
      Abstract: Human induced alterations of river systems are ubiquitous throughout the world. Alterations have reduced riverine habitat and negatively affected riverine species; therefore, it is crucial to understand what habitats are important to riverine fish at multiple scales. Most research has focused around microhabitats (i.e., depth) with little effort on how the reach scale habitat (i.e., geomorphic landscape) influences riverine fish abundance. We examined habitat associations of shovelnose sturgeon sampled with two gears (trotlines and trammel nets) at multiple spatial scales in the lower Platte River, NE, a system that has not been overtly altered in physical description. At a microhabitat scale, shovelnose sturgeon abundance was influenced by velocities and temperatures within the lower Platte River. The influence of velocity was contradictory between gears suggesting that gear limitations may have been present. Shovelnose sturgeon abundance increased in close proximity to a tributary interaction with the lower Platte River in both gears. Portions of the river with a relatively medium valley width, low-medium sinuosity, and wide channel had the lowest shovelnose sturgeon abundance for both gears. Our results provide insight at multiple habitat scales on the landscape that may help managers and policy makers develop sound approaches to protecting and mitigating habitat for shovelnose sturgeon and other riverine species.
      PubDate: 2017-10-05T06:15:35.238102-05:
      DOI: 10.1111/jai.13513
  • Effects of temperature and hydrology on growth of shovelnose sturgeon
           Scaphirhynchus platorynchus (Rafinesque, 1820) in the lower Mississippi
    • Authors: J. M. Porter; H. L. Schramm
      First page: 21
      Abstract: We evaluated the effects of thermal and hydrologic conditions on the growth of shovelnose sturgeon (Scaphirhynchus platorynchus) in the lower Mississippi River, USA. Duration of water temperatures 12–24°C had a positive influence and temperatures below 11°C had a negative influence on annual growth increment, but these two variables accounted for less than 15% of the variation in growth. Duration of water temperatures above 28°C, duration of floodplain inundation, duration of low water, and minimum and maximum river stage did not influence annual growth increment. Growth of shovelnose sturgeon in the lower Mississippi River appears to be positively influenced by duration of moderate water temperatures but minimally influenced by hydrologic conditions. The low variation accounted for by thermal and hydrologic variables suggests annual growth increment may be largely influenced by additional abiotic or biotic factors.
      PubDate: 2017-11-28T02:26:14.657688-05:
      DOI: 10.1111/jai.13548
  • The effect of water velocity on feeding efficiency of juvenile Chinese
           sturgeon, Acipenser sinensis
    • Authors: X. L. Gu; F. Zhao, P. Zhuang, X. T. Shi, G. P. Feng, T. Zhang, J. Y. Liu, B. Kynard
      Pages: 29 - 32
      Abstract: The effect of water velocity on feeding of benthic cruising foragers, like sturgeons, is poorly understood. Using an artificial endless stream, we conducted experiments with wild juvenile Chinese Sturgeon, Acipenser sinensis, to test the hypothesis that water current speed affects juvenile feeding efficiency on the Barcheek Goby, Rhinogobius giurinus, a common wild prey. Feeding consumption (Fc) of juveniles was positively related to water current speed (current speed in cm−1: mean Fc value) follow: 0: 2.33; 11:7.33; 31: 10.67; and 41: 13.7. Thus, current speed had a significant effect on foraging efficiency by sturgeon. The results indicate foraging by wild A. sinensis juveniles on gobies occurs mostly during flood and neap tidal flows when current velocities are fastest.
      PubDate: 2017-10-27T07:26:22.786451-05:
      DOI: 10.1111/jai.13526
  • Are shovelnose sturgeon a valid diet surrogate for endangered pallid
           sturgeon during the first year of life'
    • Authors: N. J. C. Gosch; A. P. Civiello, T. R. Gemeinhardt, J. L. Bonneau, J. M. Long
      Pages: 39 - 41
      PubDate: 2017-10-04T05:10:24.817877-05:
      DOI: 10.1111/jai.13512
  • Lipid acquisition and retention in tissues of spawning adult paddlefish
           Polyodon spathula (Walbaum, 1792) in relation to extended and compressed
           life history patterns in two river‐reservoir systems
    • Authors: R. J. Hemingway; D. L. Scarnecchia
      First page: 42
      Abstract: Data from recreationally caught adult paddlefish from North Dakota and Oklahoma, USA, was used in an initial attempt to explain variation in lipid content in adult wild paddlefish Polyodon spathula (Walbaum, 1792) by stock and by sex. The objectives of this study were to describe the relative importance of three distinct paddlefish tissues [white muscle, red muscle, and gonadal fat body (GFB)] for lipid storage, and compare lipid content of these tissues between stock and sex. It was hypothesized that lipid content of the three tissue types would be related to each other within individual fish; and that, consistent with previously documented life history differences, lipid concentrations for all tissues would be sex‐ and stock‐specific. Paddlefish were sampled in April and May 2012 from the Grand Lake, Oklahoma, USA (GL) and Yellowstone‐Sakakawea, North Dakota (SAK) stocks. Three tissue types were collected from SAK fish, including white muscle (N = 137; 83M, 54F), red muscle (N = 74; 36M, 38F), and GFB (N = 164; 105M, 59F). Samples from GL fish included white muscle (N = 60; 36M, 24F), and GFB (N = 42; 41M, 1F). Proximate analysis was used to quantify the percentage of lipid, water, ash, and protein in tissue samples. The lipid component of proximate analysis was completed using the ANKOM method of lipid extraction which uses heated petroleum ether to extract lipid. Also investigated were lipid accumulation and storage in adult paddlefish in relation to tissue type: white muscle, red muscle, gonadal fat bodies (GFB) within individual fish, between the sexes, and between the two different stocks. White muscle was significantly correlated with both red muscle and GFB lipid, but red muscle lipid was not significantly correlated with GFB lipid. White muscle lipid content differed by stock and sex, with the more northerly stock having higher lipid content than the more southerly stock. Females had higher white muscle lipid content (SAK F = 17.18, M = 9.09; GL F = 6.74, M = 4.99) and red muscle (SAK F = 47.72, M = 30.93) than males. In contrast, GFB lipid differed by sex but not stock, with females having lower lipid content (SAK = 79.79, GL = 89.08) than males (SAK = 89.08; GL = 91.72). Life history differences, growing season, and the role of metabolism may help explain the differences in concentrations of lipids observed between stocks and between the sexes for all three tissues. It was hypothesized that different tissues may be used for different metabolic processes and that although metabolism likely strongly influences muscle tissue lipid, GFB lipid is probably linked more closely to reproductive demands associated with gonad development.
      PubDate: 2017-12-11T02:42:11.749962-05:
      DOI: 10.1111/jai.13580
  • Mortality of Baltic sea trout (Salmo trutta) after release from gillnets
    • Authors: L. Veneranta; T. Pakarinen, E. Jokikokko, I. Kallio-Nyberg, H. Harjunpää
      Pages: 49 - 57
      Abstract: We explore the mortality rate of disentangled sea trout in whitefish fishery using gillnets with a 35–43 mm bar length. The study was conducted during the main fishing seasons in the Gulf of Bothnia in the northern Baltic Sea. Overall 59.5% of the sea trout were alive at the end of a 2–7 day observation period following release from the gillnets. Altogether, 12.1% of the captured fish were found dead in gillnets and 28.4% died due to injuries during an extended observation period. The average length of the captured sea trout was 435 mm, indicating that the majority were spending their first or second year at sea. The proportion of the survived and not injured (no observed damage) fish was highest in larger fish,>450 mm. The injured and not injured fish died equally frequently. Post capture survival was not connected to the removal time from gillnets or type of observed injuries but to the type of entanglement. Most of the fish were entangled by a mesh around the body, which caused extensive scale loss and open sores on the skin. The smallest fish may have had internal wounds that were not registered in this study. These results can be used in fisheries management to estimate the mortality of multi-species gillnet fishing to sea trout populations in relation to management actions.
      PubDate: 2017-10-11T05:20:59.898916-05:
      DOI: 10.1111/jai.13517
  • Multiple origins of stone loach, Barbatula barbatula (Teleostei:
           Nemacheilidae), in Sweden based on mitochondrial DNA
    • Authors: M. Norén; S. Kullander, T. Nydén, P. Johansson
      Pages: 58 - 65
      Abstract: Stone loach, Barbatula barbatula, occurs in scattered localities in Sweden. Some of the populations have usually been considered as feral descendants of escaped 18th Century pond stock, but historical documentation is inconclusive. Using the mitochondrial COI gene as a marker, we analyzed specimens from seven Swedish localities. One of the middle Swedish localities, in Stockholm, belongs to a haplotype found also in Poland and Lithuania. Two other samples, from near Nyköping and Lake Hjälmaren, belong to a haplotype found in northeastern Europe (Finland, Estonia, Latvia, Volga basin in Russia). Those two Swedish populations are probably descendants from at least two introductions, probably for pond rearing for human consumption. Samples from Skåne and Halland in southern Sweden belong to the haplotype found in Denmark, northern Germany and Poland; and whereas it remains possible that they also represent feral populations, they may be naturally occurring, having reached Sweden during the Ancylus period, about 8,000–10,000 years ago. A recently discovered population from the central South Swedish Highlands belongs to a mainly southeastern European haplotype. It probably represents a release of imported aquarium specimens or live bait carried by sport fishing tourists.
      PubDate: 2017-09-28T01:20:54.422267-05:
      DOI: 10.1111/jai.13507
  • Characterization of food web structure of the upper continental slope of
           the Celtic Sea highlighting the trophic ecology of five deep-sea fishes
    • Authors: D. Kopp; M. Robert, L. Pawlowski
      Pages: 73 - 80
      Abstract: In marine ecosystems, the study of trophic relationships has extensively benefited from the development of stable isotope analyses (SIA) as dietary tracers. SIA are particularly useful in elucidating the structure of deep sea food webs given the constraints involved in obtaining gut-content data from deep trawling. We used carbon and nitrogen stable isotope analyses and Stable Isotope Bayesian Ellipses in R (SIBER) and Stable Isotope Analysis in R (SIAR) routines, to determine the trophic ecology of five deep-sea fishes from the upper continental slope of the Celtic Sea. SIA made it possible to deduce some general tendencies in food-web structure and species trophic interactions and confirmed diet determined by gut-content analysis for the same species, in other ecoregions. More specifically, mixing models revealed that the deep sea species considered are omnivorous and are able to feed on all the sampled taxa. Based on isotopic ratio, no clear differences in fish diet could be detected from one species to another except for rabbit fish, which has benthic affinities. Three species, blackbelly rosefish, greater forkbeard and softhead grenadier showed overlapping isotopic niches. This study is the first attempt to describe the trophic ecology of deep sea species on the Celtic Sea upper continental slope. In the context of the development of ecosystem integrated modeling approaches for managing fisheries in the Celtic sea, and considering the vulnerability of deep-water species, improving the knowledge on the trophic ecology of these local species is of importance in order to allow their sustainable exploitation.
      PubDate: 2017-11-16T00:06:16.674834-05:
      DOI: 10.1111/jai.13544
  • Reproductive biology of the invasive species Pseudoxiphophorus bimaculatus
           and Poecilia sphenops in the Teuchitlán River, México
    • Authors: A. Ramírez-García; J. P. Ramírez-Herrejón, M. Medina-Nava, R. Hernández-Morales, O. Domínguez-Domínguez
      Pages: 81 - 90
      Abstract: Reproductive biology of invasive species is not often studied relative to the invasion process, although it may provide an accurate indicator of the invasion stage. We evaluated the reproductive biology of the exotic fish species Pseudoxiphophorus bimaculatus and Poecilia sphenops in the Teuchitlán River, Jalisco, Mexico by fertility, size at first maturity, sex ratio, gonad maturity stage, gonadosomatic index, condition factor, size-structure, and habitat. The reproductive variables were related to environmental characteristics using the non-metric analysis of multidimensional scaling. A total of 1374 specimens of P. bimaculatus and 571 of P. sphenops were captured by seine netting and electrofishing. Maximum fertility of P. bimaculatus was 15.99 ± 2.27 embryonated eggs and embryos and, for P. sphenops, 31.26 ± 4.17. Females predominated among P. bimaculatus, while in P. sphenops the sex ratio was ~1:1. We found mature female and male of P. bimaculatus in degraded sites and juveniles in the springs. Poecilia sphenops reproduced along the river. The establishment of both invasive species in the Teuchitlán River is evidence that they share the reproductive habitat with native fish species, and tend to spread and colonize new areas.
      PubDate: 2017-11-16T00:05:58.666967-05:
      DOI: 10.1111/jai.13543
  • Age and growth of the Giant Kelpfish, Heterostichus rostratus Girard 1854,
           in Southern California, USA
    • Authors: M. S. Winston; J. T. Claisse, C. M. Williams, J. P. Williams, D. J. Pondella
      Pages: 91 - 96
      Abstract: In order to update existing life history parameters, age and growth patterns were determined for Giant Kelpfish, Heterostichus rostratus sampled from nearshore kelp forest and estuary habitats in southern California (USA) from April 2012 through June 2015. Fish were collected by pole spear, beach seine, beam trawl, purse seine, and square enclosure. Using age-at-length data derived from otolith readings, Giant Kelpfish were found to have a relatively short life span with the largest examined fish reaching a maximum total length of 413 mm at an age of 5 years. Von Bertalanffy growth parameters estimated for this species were: L∞ = 45.1 cm, k = 0.25, t0 = −0.66. Standard length (SL, cm)-total length (TL, cm) and total length (TL, cm)-weight (W, g) relationships were described by the equations: SL = 0.90 TL – 1 and W = 2.21 × 10−3 TL3.39, respectively. Wild juvenile Giant Kelpfish collected for this study had a higher growth rate than laboratory-reared fish from a previous study.
      PubDate: 2017-11-16T00:06:09.256016-05:
      DOI: 10.1111/jai.13541
  • Seasonal growth differences of larval Hyporhamphus picarti (Hemiramphidae)
           in the Sine Saloum estuary, Senegal
    • Authors: J. Döring; S. I. Neumann, H. Sloterdijk, W. Ekau
      Pages: 97 - 102
      Abstract: The African halfbeak Hyporhamphus picarti (Hemiramphidae) is one of the most abundant species within the ichthyoplankton community of the Sine Saloum estuary (Senegal). A year-round occurrence of larvae suggests that the Sine Saloum is an important spawning habitat for this species. Annual fluctuations in water temperature, however, can have severe impacts on the survival probabilities of marine fish larvae. To determine whether temperature has an effect on the growth of H. picarti during its larval development, larval age at length and somatic growth rates were investigated for two contrasting spawning seasons in 2014: February (cold season, 20.8°C) and June (warm season, 26.4°C). In both months H. picarti larvae were sampled at the mouth of the Saloum River using neuston nets. Sagittal otoliths’ increments were counted to estimate the larva age at a given standard length (SL). The age of larvae ranged between 2 and 22 days, with SL of 3.86–21.68 mm, respectively. In order to describe larval age at length during the contrasting spawning seasons, two distinctive Gompertz functions were applied. Accordingly, specimens sampled in June (0.94 ± 0.17 mm per day) exhibited significantly higher somatic growth rates than those sampled in February (0.60 ± 0.06 mm per day). These findings suggest that water temperature is an important factor influencing larval growth in H. picarti. Information concerning the early life stages of H. picarti are scarce and the results of the present study may contribute to a better understanding of the species’ biology and ecology.
      PubDate: 2017-11-02T06:55:53.275677-05:
      DOI: 10.1111/jai.13528
  • Aspects of reproductive biology of the red goby Trypauchen vagina
           (Gobiidae) from the Mekong Delta
    • Authors: Q. M. Dinh
      Pages: 103 - 110
      Abstract: This study provides knowledge on reproductive traits of Trypauchen vagina, a target fish for catching, based on data analysis of 701 individuals collected in the Mekong Delta from January to December 2015. The species is a multiple spawner depositing eggs in early wet season (June–August) since gonadosomatic index reaches a high point during this period, supported by the appearance of ripe and spent gonads at that time. Male and female fish matures firstly at 16.59 and 16.81 cm in total length respectively. The species displays high batch fecundity (4,000–12,750 eggs/female). Knowledge of length at first maturity and spawning season is essential for local authorities to set the suitable fish length and time for fishing. The results provide fundamental information on the reproductive biology and contributed to knowledge for fish population sustainable management.
      PubDate: 2017-10-30T04:21:07.232161-05:
      DOI: 10.1111/jai.13521
  • The influence of prey size, sediment thickness and fish size on
           consumption in common sole (Solea solea L.)
    • Authors: S. S. W. Ende; J. W. Schrama, J. A. J. Verreth
      Pages: 111 - 116
      Abstract: This study determined prey consumption in common sole as a function of prey size (0–0.5, 1–1.5, 2–2.5 and 4–5 g), sediment thickness (20 cm and 2 cm) and fish size (50 g, 125 g or 300 g). Prey consumption (in numbers of prey eaten per fish per day) was reduced with increasing prey size and sediment thickness, and was increased with increasing fish size (p 
      PubDate: 2017-10-26T00:10:27.326561-05:
      DOI: 10.1111/jai.13520
  • Prevalence and intensity of Allocreadium isoporum (Digenea:
           Allocreadiidae) in three endemic species of cyprinids (Capoeta spp.) in
           Turkey, in relation to season, host size and sex
    • Authors: Ali Aydogdu; Gerardo Pérez-Ponce de León, Yilmaz Emre, Nesrin Emre, Ayşegül Yabacı
      Pages: 129 - 135
      Abstract: Three species of cyprinids, i.e., Capoeta antalyensis (n = 112), C. caelestis (n = 99) and C. angorae (n = 178) were collected from the Anatolian Region of Turkey to carry out this investigation. A total of 389 specimens of Capoeta were examined for Allocreadium isoporum infections throughout the four different seasons of 2012. The prevalence and mean intensity of infection of A. isoporum was investigated in relation to the host species, the seasons across the year, host size, and sex. Two-hundred and twenty-two specimens of a trematode identified as A. isoporum were found in these fishes. One-hundred seventy-eight C. angorae were caught, and 70 A. isoporum were recorded in 8 of 178 fish examined, with prevalence and mean intensity of infection of 4.49% and 8.7% parasites per infected fish, respectively. In the 112 specimens of C. antalyensis, 73 individuals of A. isoporum were found, with a prevalence of 19.6% and a mean intensity of 3.3. As for the infection in C. caelestis, a total of 79 specimens of A. isoporum were found in 17 of the 99 fish examined, with prevalence and mean intensity of infection of 17.1% and 4.6%, respectively. Prevalence and mean intensity values in relation to host size and sex, as well as the seasonality of infections was analyzed and the results were compared with other studies. The trematode A. isoporum is reported for the first time parasitising three endemic species of Capoeta spp. in Turkey, adding to the knowledge of geographical distribution and host range of this trematode species.
      PubDate: 2017-10-06T23:40:32.331408-05:
      DOI: 10.1111/jai.13515
  • Relationships between total length and otolith measurements for 36 fish
           species from Gökçeada Island, Turkey
    • Authors: A. Altin; H. Ayyildiz
      Pages: 136 - 141
      Abstract: The relationships between fish total length and otolith measurements (OL, OW and OR) were described by means of allometric power equation for 36 fish species from Gokceada Island, Turkey. Regressions were also estimated at genus level. A total of 14364 specimens were collected monthly using beach seine (0–2 m) and beam trawl (5–20 m) from June 2013 to June 2014. Generally, the otolith length showed the highest correlation for predicting fish total length. This paper represents the first relationships between otolith morphometrics and fish total length for 12 species. These relationships can be useful for researchers who examining stomach contents of piscivorous predators.
      PubDate: 2017-09-27T01:40:24.835591-05:
      DOI: 10.1111/jai.13509
  • Length‐weight relationships of five fish species from the Daninghe
           River, China
    • Authors: Z. Yang; L. Wan, Y. Gong, Y. T. Gong, N. Zhao, Y. Qiao, H. Y. Tang
      First page: 151
      Abstract: Length‐weight relationships were described for five fish species belonging to three families and four genera from the Daninghe River, one of primary tributaries of the upper Yangtze River, China. A total of 1894 specimens were collected from 2014 to 2016 by using electro‐fishing equipment. Length–weight relationships for five species were recorded previously in FishBase and new maximum total lengths for five species were also presented in this paper. The results will be useful for fishery research, management and conservation in the upper Yangtze River Basin.
      PubDate: 2017-12-12T00:35:34.054987-05:
      DOI: 10.1111/jai.13445
  • Morphometric relationships for some species of elasmobranch from tropical
           eastern Pacific
    • Authors: C. Polo-Silva; G. Acevedo, S. Siu, J. M. Carvajal, M. Ixquiac, S. Bessudo, A. M. Suarez, V. Puentes
      Pages: 157 - 161
      Abstract: This study proposes length relationship equations to determine total length of four species of sharks (Carcharhinus falciformis, Mustelus lunulatus, Sphyrna lewini and Carcharhinus limbatus) based on trunk lengths (TrL) and interdorsal lengths (IL) caught in Colombia and Central America Pacific Ocean. In Central American Pacific, data were recorded for C. falciformis, C. limbatus and S. lewini between 2006 and 2012. In the Colombian Pacific, data was recorded in 1994–1995 and from 2006 to 2012 for C. falciformis, S. lewini and M. lunulatus. In the Central American Pacific the IL – TL relationship was acceptable for C. falciformis (r2 = .69) and C. limbatus which presented a good relationship (r2 = .81) where most specimens were juveniles; the same trend was found for S. lewini (r2 = .96). The TL-TrL relationship estimated for species caught in the Colombian Pacific was significant for C. falciformis (r2 = .98) and for M. lunulatus (r2 = .84); however, for S. lewini this relationship was low (r2 = .55). Results indicate this is a useful tool for fishery statistics and fishery management for elasmobranch species of the Eastern Tropical Pacific.
      PubDate: 2017-08-04T01:57:27.692597-05:
      DOI: 10.1111/jai.13460
  • Length–weight relationships of five mullet fish species from the
           Southern Taiwan coast
    • Authors: F.-J. Lin; W.-K. Wang, M.-J. Chen, H.-D. Lin, Y.-T. Ueng
      Pages: 162 - 163
      Abstract: The length–weight relationships (LWRs) are described for five fish species, Liza affinis (Gunther, 1861), Liza alata (Steindachner, 1892), Chelon subviridis (Valenciennes, 1836), Chelon macrolepis (Smith, 1846) and Oedalechilus labiosus (Valenciennes, 1836), obtained from Southern Taiwan coast during July 2013 to October 2016.The length–weight parameter b for these species ranged from 2.734 to 2.974, with regression coefficients (r2) ranging from 0.966 to 0.979.
      PubDate: 2017-09-27T01:40:20.099558-05:
      DOI: 10.1111/jai.13506
  • Length-weight relationships of nine fish species from the Qingjiang River,
           Yangtze River basin, China
    • Authors: G. Huang; Q. D. Wang, X. H. Chen, T. Yuan, T. Xiang, J. S. Liu, J. Yuan, Z. J. Li
      Pages: 164 - 166
      Abstract: This study presents the first report of length-weight relationships (LWRs) for five fish species (Parabotia fasciata, Megalobrama mantschuricus, Plagiognathops microlepis, Rhodeus sinensis, Rhodeus fangi) and maximum total lengths for four species from the Qingjiang River, Yangtze River basin, China. Specimens were sampled in six sections along the Qingjiang River over a period of 1 year between April 2016 and March 2017 with gill nets (150 × 10 m; mesh size: 1–14 cm), benthic fyke nets (mouth opening: 12 × 12 cm; 10 m; mesh size: 1 cm) and stationary lift nets (10 × 10 m; mesh size: 0.8 cm).
      PubDate: 2017-10-04T05:45:24.503905-05:
      DOI: 10.1111/jai.13510
  • Length-weight relationships of four fish species from mangrove of
           Zhanjiang, China
    • Authors: W. Xiong; G. P. Zhu, Z. L. Wang, N. Ye
      Pages: 167 - 168
      Abstract: Length-weight relationships were determined for four fish species [Acentrogobius viridipunctatus (Valenciennes, 1837); Acentrogobius caninus (Valenciennes, 1837); Glossogobius olivaceus (Temminck & Schlegel, 1845); and Lutjanus ophuysenii (Bleeker, 1860)] belonging to two families. Samples were collected from 2002 to 2010 by cage net (50 × 15 × 15 cm, mesh size 0.5 cm) from Zhanjiang mangrove in China (20°36′N; 110°54′E). The total length ranged is between 2.3 and 18.1 cm and weighted between 0.3 and 90.2 g. The allometric coefficient (b) of length-weight relationship varied from 2.72 for Zenarchopterus buffonis to 3.48 for Acentrogobius viridipunctatus. Length-weight relationships for these four fish species were determined for the first time.
      PubDate: 2017-11-01T23:56:14.595571-05:
      DOI: 10.1111/jai.13516
  • Length-weight relationship and relative condition factor of five
           indigenous fish species from Torsa River, West Bengal, India
    • Authors: S. K. Koushlesh; A. Sinha, K. Kumari, S. Borah, T. N. Chanu, R. Baitha, S. K. Das, P. Gogoi, S. K. Sharma, M. H. Ramteke, B. K. Das
      Pages: 169 - 171
      Abstract: Length-weight relationships (LWRs) for five indigenous fish species under five genera and two families, namely Cyprinion semiplotum (McClelland, 1839), Barilius barna (Hamilton, 1822), Barilius barila (Hamilton, 1822), Gagata sexualis Tilak, 1970 and Pseudolaguvia shawi (Hora, 1921) were studied from Torsa River in West Bengal, India. Sampling was done at quarterly intervals from November, 2015 to December, 2016 and a total of 701 fish specimens were collected using cast nets (mesh size of 15–20 mm), gill nets (mesh size 20–35 mm) and bamboo traps. In the present study, b value ranges from 2.686 to 3.268. LWRs for these fish species (except P. shawi) have not been reported in FishBase. A new maximum length has been recorded for P. Shawi and G. sexualis. The relative condition factor (Kn) values was found to range from 1.004 to 1.028.
      PubDate: 2017-10-06T23:55:18.67652-05:0
      DOI: 10.1111/jai.13518
  • Length–Weight relationships of 23 fish species from floodplain
           ecosystems of the Andean Amazon piedmont, Peru
    • Authors: J. Chuctaya; L. Capitani, D. Faustino, E. Castro
      Pages: 172 - 176
      Abstract: Length–weight relationships (LWRs) for 23 freshwater fish species from the Andean Amazon piedmont in Peru are presented in this study. Fishes were captured between 2009 and 2010 on lagoons from three basins; Amazonas (Ampiyacu and Apayacu) and Ucayali (Pachitea) using gillnets. In this study, new LWRs are reported for 20 species of 23 species analyzed. The study provides new information on less-studied species and can serve as a basis for management of fisheries and conservation of this area.
      PubDate: 2017-10-24T01:15:19.761336-05:
      DOI: 10.1111/jai.13519
  • Length‐weight relationship of fish species from the Bijagós
           Archipelago, Guinea‐Bissau
    • Authors: E. Correia; J. P. Granadeiro, A. Regalla, P. Catry
      First page: 177
      Abstract: Length–weight relationships were estimated for six teleost fish species occurring in Bijagós Archipelago, Guinea‐Bissau. Samples were collected seasonally during three dry seasons (2013/2014, 2014/2015, 2015/2016) and two rainy seasons (2015 and 2016). Fishes were captured by three methods: angled from the beach or a boat; using beach seine with a mesh size ranging 0.5–1 cm; drift netting from a boat (mesh size 2 cm). This work provides the length‐weight relationship for three fish species that are not reported in FishBase (Citharichthys stampflii, Gerres nigri and Psettodes belcheri) as well as for three species from which we present a wider size range (Eucinostomus melanopterus, Scomberomorus tritor and Sphyraena afra).
      PubDate: 2017-11-27T00:50:20.516603-05:
      DOI: 10.1111/jai.13522
  • Length–weight relationships of 13 fish species from the Lijiang
           River, China
    • Authors: M.-H. Gao; Z.-Q. Wu, L.-L. Huang, Y. Ding, Z.-J. Zhu
      Pages: 180 - 182
      Abstract: The length–weight relationships (LWRs) of 13 species belong to three orders and four families from the Lijiang River, China. Samples were obtained between 2013 April and 2015 January using gillnets (25 × 12 m, mesh size 0.5 cm), trawl nets (50 × 12 m, mesh size 0.5 cm) and fishhooks (0.5 × 0.5 × 10 m, mesh size 0.5 cm mesh). Exponent b varied from 2.639 to 3.549 and r2 values varied from .962 to .995.
      PubDate: 2017-10-30T04:20:23.151232-05:
      DOI: 10.1111/jai.13523
  • Length-weight relationship of three fish species from the Poyang Lake,
    • Authors: Q.-G. Zhu; L.-L. Sun
      Pages: 183 - 184
      Abstract: The paper reports the length–weight relationships of 3 species from the Poyang Lake, the largest freshwater lake freely connect to the Yangtze River, China. A total of 1,207 specimens were collected seasonally (January, April, September and November, 2010) using various types of fishing gear nets (mesh size: 1–12 cm) and stationary lift nets (mesh size: 0.7–4.4 cm). For each species, the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Length-weight relationships for 1 species were unknown to FishBase, and new maximum lengths are recorded for 2 species.
      PubDate: 2017-10-27T07:26:24.298305-05:
      DOI: 10.1111/jai.13524
  • Twenty-eight additions to the length-weight and length-length
           relationships of Indo-Pacific fishes from the Davao Gulf, Philippines
    • Authors: A. R. Bos; G. S. Gumanao, M. Silvosa
      Pages: 185 - 189
      Abstract: Selected fish were measured on markets along the Davao Gulf, Philippines between 2009 and 2016, augmenting the number of Length-Weight relationships (LWR) published earlier for the same area. LWRs were calculated for 28 fishes including those of 12 firstly reported, rare species. SL-TL and SL-FL relationships were determined for 28 and 25 species (also including 8 and 12 newly reported relationships, respectively). Minimum size at which individuals start developing forked tails are provided for Cheilinus fasciatus (SL = 15.0 cm), Plectorhinchus polytaenia (SL = 27.0 cm), Pseudobalistes flavimarginatus (SL = 18.0 cm) and Thalassoma hardwicke (SL = 11.5 cm). The flatfish Psettodes erumei had a right-left eyed ratio of 0.55.
      PubDate: 2017-11-01T03:20:21.965454-05:
      DOI: 10.1111/jai.13525
  • Length-weight relationships of five needlefish species from Kerala waters,
           south-west coast of India
    • Authors: S. K. Roul; T. B. Retheesh, U. Ganga, E. M. Abdussamad, P. Rohit, A. K. Jaiswar
      Pages: 190 - 192
      Abstract: Length-weight relationships (LWRs) were estimated for five needlefish species such as Ablennes hians (Valenciennes, 1846), Tylosurus crocodilus (Péron & Lesueur, 1821), Tylosurus acus melanotus (Bleeker, 1850), Strongylura leiura (Bleeker, 1850), and Strongylura strongylura (van Hasselt, 1823). Specimens were collected on weekly basis from Cochin Fisheries Harbour (Lat. 09056′327″N, Long. 76015′764″E), Munambam Fisheries Harbour (Lat. 10010′965″N, Long. 76010′258″E), Kalamukku (Lat. 09059′924″N, Long. 76014′564″E) and Chellanam (Lat. 09047′950″N, Long. 76016′551″E), between October 2015 to August 2017. Fish were captured by traditional long liner (hook no. IX-XIV) and ring seiner (mesh size 8–24 mm). The estimated allometric co-efficient b values ranged from 3.063 (Tylosurus acus melanotus) to 3.962 (Strongylura leiura) and r2 values ranged from 0.850 (Tylosurus acus melanotus) to 0.992 (Tylosurus crocodilus). All the LWRs were highly significant, with p 
      PubDate: 2017-11-02T06:56:07.831971-05:
      DOI: 10.1111/jai.13527
  • Length-weight relationships of four fish species from the continental
           shelf of Yucatán (SW Gulf of México)
    • Authors: J. De La Cruz-Agüero; R. Moncayo-Estrada, J. G. Chollet-Villalpando, V. M. Cota-Gómez
      Pages: 193 - 195
      Abstract: This paper presents length-weight relationships (LWR) for four fish species from the continental shelf of Yucatán, at the Sonda de Campeche (southwestern Gulf of México). Samples were taken using shrimp trawl nets (5.71 cm squared mesh size in the cod-end) in the mid-summer of 2016. All LWRs were significant with r2 values ranged from .946 to .994 and the values of exponent b, estimated using simple linear least squares of log-transformed weight and length data, ranged from 2.54 to 3.10 (p 
      PubDate: 2017-11-01T06:05:22.751358-05:
      DOI: 10.1111/jai.13529
  • Length-weight relationships of ten tropical finfish species from north
           eastern Arabian Sea, India
    • Authors: G. B. Purushottama; K. V. Akhilesh, B. B. Chavan, B. N. Katkar, Thakurdas, V. V. Singh
      Pages: 196 - 199
      Abstract: The length weight relationships (LWRs) of ten tropical finfish species from north eastern Arabian Sea, India were studied. Specimens were caught using a wide range of fishing gear mainly trawl nets (20–25 mm), dol nets or bag nets (20–40 mm) and gill nets (80–270 mm) operated in Maharashtra maritime waters during 2012–2016. The specimens were measured for total length, and weight, then dissected and the sex confirmed. Previously unavailable in FishBase, the detailed LWR of Polydactylus mullani is reported for the first time. Maximum total lengths presented for six species in this study are new records. The existence of a differential growth between male and female was confirmed for five species, which was not known earlier. The LWR data will be useful for deriving future sustainable management and conservation strategies.
      PubDate: 2017-11-06T02:54:39.763101-05:
      DOI: 10.1111/jai.13530
  • Length-weight and length-length relationships of four small fishes from
           the Atrai River, Dinajpur, Bangladesh
    • Authors: M. R. Islam; S. Roy, M. J. Mia, A. K. M. Rohul Amin
      Pages: 200 - 202
      Abstract: Length-weight (LWRs) and length-length relationships (LLRs) were determined for four fish species collected from the Atari River in Dinajpur of Bangladesh. Sampling took place monthly between January and June 2016, using seine nets of commercial fishermen (mesh size 4 mm). In LWRs (r2 > .927, p  .812, p 
      PubDate: 2017-11-06T02:54:57.73165-05:0
      DOI: 10.1111/jai.13531
  • Length–weight relationships of six fish species from the headstream
           region of the Dongjiang River, China
    • Authors: F. Lin; Q. H. Zhou, D. H. Yang, Z. L. Lu, J. Zhang
      Pages: 203 - 205
      Abstract: Dongjiang River, a main tributary of the Pearl River, is geographically situated in South China. The present study describes the length–weight relationships (LWRs) of six fish species (Acrossocheilus paradoxus, Barbodes semifasciolatus, Onychostoma elongatum, Microphysogobio fukiensis, Microphysogobio kiatingensis, Metzia lineata) from the headstream region of the river including five Chinese endemic species (A. paradoxus, B. semifasciolatu, O. elongatum, Mi. fukiensis, Mi. kiatingensis). Fish species of five genera of the same family were collected quarterly from April 2012 to October 2014 by using non-selective fishing gears: drag nets (5 m, mesh-size 3 cm), drift gillnets (30 × 15 m, mesh-size 5 mm), fish cages (4 m, mouth opening 40 × 40 cm), scoop nets (mesh-size 0.5-1 cm), and electro-fishing (12V, 200 Hz). The parameter a and b in the LWR equations (W = a Lb) ranged from 0.0014 to 0.0228, and 2.89 to 3.18, respectively. Compared with FishBase, this study provides the first LWR records for four cyprinids (A. paradoxus, B. semifasciolatu, O. elongatum, Me. lineata) and a new record of maximum body length for O. elongatum.
      PubDate: 2017-11-02T06:55:31.372285-05:
      DOI: 10.1111/jai.13534
  • Length-weight relationships of three fish species from the costal of
           Hainan, the South China Sea
    • Authors: Q. T. Zeng; J. Y. Li, H. T. Liu, Y. X. Cheng
      Pages: 206 - 207
      Abstract: Length-weight relationships were determined for three fish species [Bregmaceros rarisquamosus Munro, 1950; Sardinella albella (Valenciennes, 1847) and Cynoglossus macrolepidotus (Bleeker, 1851)] inhabiting the coastal of Hainan, China. Fishes were collected using gillnets (mesh size 0.5 cm) and electrofishing from 2005 to December 2012. The b-values of the equations ranged between 2.57 for Bregmaceros rarisquamosus and 3.34 for Cynoglossus macrolepidotus and thus were just inside the acceptable range for this value. Further, for B. rarisquamosus a new TLmax was recorded.
      PubDate: 2017-11-08T02:30:22.133017-05:
      DOI: 10.1111/jai.13535
  • Length-weight relationships (LWRs) of four freshwater fish species from
           the Brahmaputra and Barak river basins, northeast India
    • Authors: S. Basumatary; H. Choudhury, B. Talukdar, D. Sarma
      Pages: 208 - 209
      Abstract: The present study describes the length-weight relationships (LWRs) were determined for four fish species, collected from the Brahmaputra and Barak river basins in northeast India using cast nets (2.5 × 1 m; 10–15 mm mesh size) and gillnets (30 × 0.9 m; 5–10 mm mesh size), from June 2016 to July 2017. The b values in LWRs were determined as 2.70 for Badis tuivaiei Vishwanath & Shanta, 2004, 2.93 for Canthophrys gongota (Hamilton, 1822), 2.62 for Glyptothorax botius (Hamilton, 1822), and 3.22 for Gogangra viridescens (Hamilton, 1822).
      PubDate: 2017-11-02T06:55:33.500998-05:
      DOI: 10.1111/jai.13536
  • Length-weight relationships for five fishes in the Pengxi River, a main
           tributary of the Three Gorges Reservoir, China
    • Authors: Y. F. Que; Z. Yang, H. Y. Tang, W. T. Li, N. Xu, D. M. Xu, F. Shi
      Pages: 210 - 212
      Abstract: The length-weight relationships and new total length are described for five fish species in the Pengxi River basin of the Three Gorges Reservoir. Fish were occasionally sampled from five sites between 2009 and 2014, using various gill nets (mesh size range 2–12 cm) and electrofishing. For four of the five species studied a new maximum total length not yet recorded in previous length-weight estimates have been found. These data will help to convert length data from field studies in the Three Gorges Reservoir into weight and biomass.
      PubDate: 2017-11-10T05:40:24.806827-05:
      DOI: 10.1111/jai.13537
  • Length–weight relationships of three demersal fish species caught from
           the eastern region of Java Sea, Indonesia
    • Authors: M. Saleh; T. W. C. Putranto, A. Arisandi, A. Soegianto
      Pages: 213 - 215
      Abstract: Length–weight relationship (LWR) parameters were determined for three demersal fish species Nuchequula gerreoides, Scarus scaber and Therapon theraps. The fishes were collected by seine net (the mesh size of wing: 12.70 cm, body: 3.81 cm, cod end: 2.54 cm, and total length of net: 20 m) in eastern region of Java Sea Indonesia during October 2016 – March 2017. The total length of these species (14.3 cm for N. gerreoides, 24.5 cm for S. scaber and 21.5 cm for T. theraps) were longer than previous studies. The b values of the LWR were 2.967 for N. gerreoides, 3.046 for S. scaber and 3.0475 for T. theraps.
      PubDate: 2017-11-10T05:40:26.140667-05:
      DOI: 10.1111/jai.13538
  • Length–weight relationships of nine rarely occurring carangids in the
           northern Arabian Sea coast of Pakistan
    • Authors: N. Qamar; S. K. Panhwar
      Pages: 221 - 223
      Abstract: In this paper, we document length–weight relationships (LWRs) for nine rarely occurring carangids, opportunistically sampled form commercial catches between 2012 and 2015 being fished from the northern Arabian Sea coast of Pakistan. After confirmation in the FishBase database all nine species Alectis indica (25), Alepes melanoptera (20), Alepes vari (22), Atropus Atropos (25), Carangoides praeustus (50), Seriolina nigrofasciata (21), Trachinotus blochi (30), Trachinotus mokalee (34) and Uraspis uraspis (17) found no LWRs previously documented. The slope values for species presented range from 2.44 to 2.93, intercepts 0.0001–0.048, coefficient of determination 0.89–0.99, and confidence intervals for slopes and intercepts of each species calculated. The LWRs data of nine species would be added in the FishBase database, and provide underlying biological data to the regional biologist for further exploration of these species.
      PubDate: 2017-11-09T07:05:32.244402-05:
      DOI: 10.1111/jai.13540
  • Length–weight and Length-length relations of four fish species from the
           Chilika Lake, East coast of India
    • Authors: S. K. Karna; V. R. Suresh, M. Mukherjee, R. K. Manna
      Pages: 224 - 226
      Abstract: This study reports the length–weight relationship (LWR) and length-length relationship (LLR) estimated for four fish species inhabiting in Chilika Lake, India. Total 504 specimens were sampled from mono-filament gill nets (mesh size 12 mm, 22–24 mm, 34–38 mm, 42 mm) during January 2015 to December 2015. The estimated b values from LWR ranged between 2.79 (T. biaculeatus) to 3.29 (C. praeustus). In all species, the relationships between length-weight and length-length were highly correlated (p 
      PubDate: 2017-11-16T00:06:10.83583-05:0
      DOI: 10.1111/jai.13545
  • Length‐weight and length‐length relationships of two gobiid fishes
           Eleotris fusca (Forster, 1801) and Odontamblyopus rubicundus (Hamilton,
           1822) from the Payra River, southern Bangladesh
    • Authors: F. Ahamed; N. Saha, S. Jahan, S. Akter, M. Y. Hossain, Z. F. Ahmed, J. Ohtomi
      First page: 227
      Abstract: The present study provides the estimates of length‐weight relationships (LWRs) and length‐length relationships (LLRs) of two gobiid fishes Eleotris fusca and Odontamblyopus rubicundus from the Payra River, southern Bangladesh. Fish samples were collected from the set bagnet (mesh size
      PubDate: 2017-11-28T02:26:23.745788-05:
      DOI: 10.1111/jai.13547
  • Length–weight relationships of four fish species from the upper Paraná
           River basin, Southeastern Brazil
    • Authors: V. M. Azevedo-Santos; P. N. Coelho, E. M. Brambilla, F. P. Lima, A. B. Nobile, J. R. Britton
      Pages: 237 - 239
      Abstract: Here the length–weight relationships (LWR, hereafter) of Pareiorhina pelicicei, Trichomycterus candidus, T. pirabitira, and T. piratymbara are provided. Samples of each species were collected between April and July 2017 with a hand net (1.5 mm mesh) in three sites from the upper Paraná River basin, Southeastern Brazil. These results increase knowledge about the LWR of Neotropical freshwater fish.
      PubDate: 2017-11-09T07:05:30.560076-05:
      DOI: 10.1111/jai.13542
  • Habitat degradation and trout stocking can reinforce the impact of flash
           floods on headwater specialist Alpine bullhead Cottus poecilopus – A
           case study from the Carpathian Mountains
    • Abstract: In freshwater streams, flooding is a typical source of natural disturbance that plays a key role in the dynamics of animal populations and communities. However, habitat degradation and fish stocking might increase the severity of its impact. We tested the effects of a flash flood on the abundance of three size classes of headwater dwelling Alpine bullhead, Cottus poecilopus, in the streams of the Carpathian Mountains in the Czech Republic, that are stocked with hatchery‐reared brown trout, Salmo trutta. We showed that the overall abundance of Alpine bullhead was highest at the sites with the least degraded habitat (i.e., natural habitat) and we caught almost no Alpine bullhead at the sites with the most degraded habitat. The flash flood had a strong negative effect on the abundance of the largest individuals of Alpine bullhead. Abundance of small and medium size Alpine bullhead was negatively affected by the abundance of adult stocked brown trout before as well as after the flash flood. However, negative effect of adult brown trout abundance on abundance of large Alpine bullhead was not significant before the flash flood, and it became significant after the flash flood. This could indicate an accumulation of negative impacts of trout stocking and flash flood on this size class. Overall, our results suggest that stocking of hatchery trout and habitat degradation can reinforce the impact of flash floods on the population of Alpine bullhead in the streams of the Carpathian Mountains.
  • Feeding ecology and prey selection of sand smelt, Atherina boyeri Risso,
           1810 in Eğirdir Lake (southern Anatolia, Turkey)
    • Abstract: Feeding ecology and prey selection of sand smelt (Atherina boyeri, Risso, 1810) were investigated by taking monthly samples (January to December 2010) at four stations of Lake Eğirdir, (Turkey) using gill nets (mesh sizes 10–100 mm) and purse‐seines (mesh size 6 mm). A total of 49 out of 612 analysed stomachs were empty (8.01%); stomach contents included eight major prey categories: zooplankton, phytoplankton, Arachnida, Arthropoda, Insecta, fishes as well as unidentified organisms and remains. Dominant prey items included cladocerans (Bosmina longirostris [% N = 67.92], Alona quadrangularis [% N = 5.06]), copepods (Nitokra hibernica [% N = 9.30], Mesocyclops leuckarti [% N = 3.35]), and arthropoda (Corophium curvispinum [% N = 3.46]). The importance of Insecta, Arthropoda, fishes, and unidentified eggs increased in the diet with increasing size of the sand smelt, whereas the contribution of Cladocera and Copepoda decreased. Sand smelt strongly preferred B. longirostris (selectivity index V = 0.639, χ2 = 81.689, p 
  • Length–weight relationships of four freshwater fishes from the
           Geoje‐island in South Korea
    • Abstract: The length–weight relationships (LWRs) for four freshwater fish species in catchment area of Geoje‐island, South Korea, were analyzed. Fish samples were collected quarterly using scoop‐nets (5 mm mesh size), casting nets (7 mm mesh size) from 2016 to 2017. LWRs data for three of these species have not yet been listed in FishBase.
  • Length‐weight relationship and condition factor of 11 fish species of
           the Igarapé Fortaleza basin, a tributary from the Amazon River system in
           eastern Amazon (Brazil)
    • Abstract: The present study investigated the length‐weight relationship (LWR) and allometric condition factor for 11 freshwater fish species of the Igarapé Fortaleza basin (00°02037.5″N; 51°06019.2″W), a tributary from the Amazon River system in the State of Amapá, northern Brazil. The fish were collected in the period from 2012 to 2014 using gillnets with different mesh sizes (10–40 mm between opposite knots). LWR parameters were estimated had angular coefficient (b) varying from 2.055 to 3.158. The allometric condition factor presented interspecific variation. These data complement the efforts to understand the biology of these Amazonian fish species.
  • Development and characterization of 15 novel polymorphic microsatellites
           for Giant river‐catfish Sperata seenghala (Sykes, 1839) using next
           generation sequencing approach
  • Length–weight relationships of three small fish species caught in the
           Yarlung Zangbo River basin, China
    • Abstract: Length–weight relationships (LWRs) were determined for three small fish species, Glaridoglanis andersonii (Day, 1870), Glyptosternum maculatum (Regan, 1905) and Pseudecheneis sulcatus (Mc‐Clelland, 1842) from the Yarlung Zangbo River basin, China. A total of 285 specimens were collected from the Yarlung Zangbo River in May and October 2017(frequency of sampling during the study period: once per month).The specimens were caught with fishing gear including drifting gillnets (nets: 10 × 1.0 m; mesh size: 3.0 cm) and shrimp cages (nets: 4.0 × 0.5 × 0.4 m; mesh size: 0.5 cm).
  • Spinal curvatures and onset of vertebral deformities in farmed Chinook
           salmon, Oncorhynchus tshawytscha (Walbaum, 1792) in New Zealand
    • Abstract: The prevalence and onset of radiological skeletal deformities in tagged Chinook salmon (Oncorhynchus tshawytscha) were investigated after 129 days in seawater at grading for removal of fish that failed to thrive (mean weight ± SEM, 432 ± 6.5 g) and again at harvest after 395 days (mean weight ± SEM, 3,721 ± 43 g). A scoring system identifying four categories of the radiographic deformity phenotype was established based on literature and evaluation of X‐rays of harvest‐size Chinook salmon. Deformity categories were: spinal curvature or Lordosis, Kyphosis, Scoliosis (LKS); Fusion; Compression and/or reduced inter‐vertebral (IV) space; Vertical shift. Of the 432 fish surviving to harvest and for which there were weights and diagnostic radiographs, 38.4% were affected by at least one deformity. Late onset LKS, detected at harvest, was the most prevalent deformity in 29.4% of all harvested fish. LKS was present alone with no other potentially confounding deformities in 10% of harvested fish. Cranial lordosis, a common LKS variant, in the postcranial region comprised half of LKS‐deformed fish. LKS commonly co‐existed with compression, a combination prevalent in harvest fish at 13.4%. Compression and/or reduced IV space detected in 22.0% of harvested fish was commonly associated with other deformity phenotypes (84/95 of fish with compression). Fusion and vertical shift were present in 7.6% and 4.6% of harvested fish, respectively. More than 77% of fish with any type of deformity developed the deformity within 9 months of harvest. Fusions that were visible in radiographs at grading persisted in fish that survived until harvest. In contrast, LKS, the most visible harvest deformity, was difficult to detect in radiographs from the earlier time point, suggesting that this economically important deformity develops at a relatively late stage of seawater growth. Deformed fish at harvest were smaller (mean ± SEM 3,479 ± 76 g) than normal (mean ± SEM 3,875 ± 51 g). Fish with no deformity grew at a significantly (p 500 g, and thus has a potential utility for other farmed salmonids.
  • Length–weight relationships of two endemic species of Alburnoides
           nicolausi (Bogutskaya & Coad, 2009) and Alburnus zagrosensis (Coad, 2009)
           in Houzian River, Lorestan Province, Iran
    • Abstract: This investigation prepares the length–weight relationships (LWRs) of two fish species, including Alburnoides nicolausi (Bogutskaya & Coad, 2009) and Alburnus zagrosensis (Coad, 2009) from Houzian River (latitude 33°22′15.20″ to 33°21′31.57″N; longitude 49°44′39.66″ to 49°44′17.67″E), Lorestan province, Iran. Fish specimens were collected monthly using seine net with 5 mm (Stretched) mesh size between April to September 2017. The LWRs for fish species were W = 0.0059L3.405 (male) and W = 0.0053L3.494 (female) for A. nicolausi, W = 0.0035L3.341 (male) and W = 0.003L3.387 (female) for A. zagrosensis, respectively. The highest value of r2 was .931 for male of A. zagrosensis and lowest value was .964 for male of A. nicolausi.
  • Length–weight relationships of three caught flatfish using shrimp
           trawler in Motaf fishing grounds, Bushehr province (Persian Gulf)
    • Abstract: This study provides length–weight relationships (LWRs) for three flatfish species: Cynoglossus bilineatus (Lacepède, 1802), Solea elongata (Day, 1877), and Pseudorhombus elevatus (Ogilby, 1912) from Motaf fishing grounds (latitude 27°00′ to 28°03′N; longitude 51°41′ to 52°11′E), Bushehr province, Iran. A total of 103 fish specimens were collected using shrimp trawler with 40 mm (stretched mesh size) at depths of 10–30 m between August and September 2017. The LWRs for fish species were W = 0.0019L3.353 for C. bilineatus: W = 0.0093L3.174 for S. elongata, and W = 0.006L3.181 for P. elevatus, respectively.
  • Length–weight relationship of selected elasmobranch species from
           north‐eastern Arabian Sea, India
    • Abstract: Length–weight relationship (LWR) was estimated for 12 elasmobranch species; five shark species, four species of rays and three species of guitar fishes from north‐eastern Arabian Sea, India. Five major landing centres of Maharashtra were selected; Satpati (Lat. 19°43′15″N, Long. 72°42′00″E), Naigaon (Lat. 19°19′32″N, Long. 72°48′54″E), Versova (Lat. 19°08′33″N, Long. 72°48′11″E), New ferry Wharf (Lat. 18°57′29″N Long. 72°51′01″E) and Sassoon dock (Lat. 18°54′42″N, Long. 72°49′33″E). Samples were collected fortnightly during August 2016 to October 2017 from various gears; drift gill nets (Hung length 114–143 m and #100–270 mm) off Satpati coast at 35–50 m depth, dol nets (length 50–65 m and cod end # 30–69 mm) in Naigaon at 38–50 m depth and trawl (length 33–72 m and cod end # 17–32 mm) in Versova, New ferry Wharf and Sassoon dock operated at 20–50 m depth. Multiday fishing was carried out with 2–3 fishing trips in a month, each trip with duration of 7–13 days. Soaking time of gill net and dol net varied from 4 to 8 hr while each trawl haul lasted for 3–4 hr. Length–weight/Disc‐width‐weight relationship showed good fit with r2 values varying from 0.818 to 0.999. In addition to information on LWR, new maximum size for three species of elasmobranchs is reported in this paper.
  • Supernumerary teeth in the pharyngeal dentition of slow‐developing
           zebrafish (Danio rerio, Hamilton, 1822)
    • Abstract: Heterochrony, which is a change in the developmental rate and timing, is one of the mechanisms proposed to explain alterations in meristic characters, such as the variation in the numbers of skeletal elements between individuals within a population. To verify the possible role of heterochrony in the evolutionary transformation of the cyprinid pharyngeal tooth formula, the development of the pharyngeal dentition in zebrafish (Danio rerio) was studied under the influence of deficiency of thyroid hormones at 28°C and standard zebrafish rearing conditions. Thiourea was used to decrease the level of thyroid hormones, a treatment known to cause retardation of several developmental processes, including skeletal development and tooth formation. Retarded development resulted in a high degree of variability as well as left – right asymmetry in the dentition. Supernumerary teeth developed; these were either extending a tooth row anteriorly or were added lateral to a tooth row, or both. An addition laterally resembled the start of formation of an accessory tooth row. Compared to younger individuals, older zebrafish showed a higher number of supernumerary teeth, often associated with a broadened attachment zone on the jaws. Both anteriorly and laterally positioned supernumerary teeth were regularly displayed. These results support the hypothesis that heterochrony can affect dental characters in cyprinids, as has been suggested in the development of the skull, caudal fin and the Weberian apparatus.
  • Effects of thyroid hormones on vertebral numbers in two cyprinid fish
           species: Rutilus rutilus (Linnaeus, 1758) and Abramis brama (Linnaeus,
    • Abstract: Previous studies revealed that thyroid hormones (TH) are crucial regulators of fish development and that manipulation of the thyroid gland function can induce developmental heterochronies. These heterochronies are known to be responsible for changes in the number of serially repeating skeletal elements, such as scales, fin rays and pharyngeal teeth. The present study demonstrates that thyroid function manipulation provokes heterochronies in the development of the fish axial skeleton. We studied the variation of the total vertebral numbers as well as the vertebral numbers in different regions of axial skeleton as influenced by manipulation of level of thyroid hormone in two cyprinid species – the common roach Rutilus rutilus (Linnaeus, 1758) and bream Abramis brama (Linnaeus, 1758). As a result, the numbers of total and caudal (more rarely, abdominal) vertebrae were significantly altered. TH‐treated fish demonstrated a reduced number of vertebrae at an earlier completion of calcification and at a smaller body size. This finding agrees well with the concept of pleomerism sensu C. C. Lindsey (). Another effect of TH on the phenotype of the axial skeleton was the frequent increase in the number of vertebrae in the caudal skeleton (four in place of the normal three) because of non‐fusions in the urostyle.
  • An overview on the teleost bone mechanophysiology
    • Abstract: Vertebrate tissues are plastic and actively adapt to the mechanical environment. Teleost bone, despite differences with its mammalian counterpart, also responds to mechanical loading, evidencing the presence of a functional mechanosensing system. Deformities such as spinal curvatures and vertebral compressions can result in internal loading disturbances. On the other hand, the external mechanical loading can be modulated by controlling gravity (i.e. inducing micro‐ or hyper‐gravity) or swimming conditions. There is an increasing interest in understanding teleost bone mechanobiology resulting from the current importance of teleosts as aquaculture resources and as biomedical models. Thus, this paper aims at reviewing relevant data that contribute to understanding fundamental questions, such as how teleost bone recognizes the biomechanical environment and how it phenotypically responds to specific mechanical changes. Particularly relevant for research purposes, technological and technical aspects of one of the most used loading‐induced systems, the swimming exercise, are also presented.
  • Fluorescence‐activated cell sorting (FACS) of osteoblasts and
           osteoclasts for RNA sequencing in a medaka, Oryzias latipes (Temming &
           Schlegel, 1846), osteoporosis model
    • Abstract: Transcriptome profiling of selected cells involved in bone formation, degeneration and repair provides novel insight into mechanisms of bone cell coupling and homeostasis. A medaka osteoporosis model was reported earlier, where excess bone resorption is triggered by induction of receptor activator of nuclear factor κB ligand (RANKL) expression, and bone cell behaviour visualized by live imaging. Herein a protocol for fluorescence‐activated cell sorting (FACS) is described that allows isolation of distinct bone cell types from larvae for subsequent RNA sequencing to detect molecular changes during different phases of bone degeneration and repair.
  • Benzo(a)pyrene reduces osteoclast and osteoblast activity in ex‐vivo
           scales of zebrafish (Danio rerio [Hamilton‐Buchanan, 1822]) and goldfish
           (Carassius auratus [Linnaeus, 1758])
    • Abstract: Environmental contaminants have previously been demonstrated to cause bone deformities mediated through the aryl hydrocarbon receptor (AhR) in fish and mammals. Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the environment, many of them capable of activating AhR. In the present study, fish scales were utilized as a model system to examine possible AhR‐mediated effects of PAHs on bone forming osteoblasts and bone resorptive osteoclasts, using the AhR‐ligand benzo(a)pyrene (BaP) as a model compound. Elasmoid scales from goldfish and zebrafish were exposed to 0.005–50 μM BaP for up to 48 hr, and the activity of osteoblastic and osteoclastic markers were measured, as well as mRNA levels of bone related genes and cyp1a and cyp3a. Using the sp7:luciferase zebrafish assay, a decrease in sp7 promoter activation was observed at the two highest concentrations (5 and 50 μM). Gelatin zymography revealed significantly reduced activity of the osteoclastic protease matrix metalloproteinase 9 (Mmp9) at the highest concentration. Furthermore, transcriptional analysis showed a dose‐dependent increase in cyp1a, however, no significant differential expression was observed for the bone related genes. The findings indicate that BaP might decrease differentiation and activation of osteoblasts, and reduce osteoclastic activity, and thus ultimately cause decreased bone formation. Further investigation is necessary in order to confirm the role of AhR in mediating these effects.
  • Zebrafish (Danio rerio, Hamilton‐Buchanan, 1822) as a model to study
           bone diseases associated with Rett syndrome
    • Abstract: Rett syndrome (RTT) is a severe neurological disorder in humans that almost exclusively affects only females. This disease is characterized by an apparent normal growth and intellectual development during the first year of life, followed by a progressive regression in development characterized by loss of purposeful use of the hands, distinctive hand movements, slowed brain and head growth, problems with walking, seizures, and intellectual disability. Mutations in the X‐linked gene methyl‐CpG‐binding protein 2 (MECP2) were described in RTT patients. Several bone diseases related with decreased bone mass starting early in life were recently ascribed to RTT. Because the zebrafish was largely validated as a model for human genetic diseases, the main objective of this work was to investigate whether zebrafish could be a good model to study bone diseases associated with RTT. For this purpose, first compared were zebrafish and human MECP2 regarding their chromosomal environment, gene structure, and protein conservation. In silico analysis showed a similar genetic structure for zebrafish mecp2 and its human ortholog, and both species present spliced isoforms. Zebrafish and human MECP2 promoter regions present similar putative binding sites for known transcription factors that affect both neural and bone metabolisms. Protein bioinformatic analysis showed a high degree of conservation between zebrafish and human, particularly in the functional domains of both proteins. In conclusion, this study demonstrates that the zebrafish has the appropriate genetic characteristics for further consideration as a model to investigate the bone diseases associated with Rett syndrome.
  • The complete mitochondrial genomes of two schizothoracine fishes
           (Teleostei, Cypriniformes): A novel minisatellite in fish mitochondrial
    • Abstract: Minisatellites, a class of variable number tandem repeats (VNTRs), are abundant throughout the control region in animal mitochondrial DNA (mtDNA) but rare in other regions of animal mtDNA. Here, we reported a novel minisatellite in fish mitochondrial genomes. We first determined the complete mitochondrial genomes of two schizothoracine fishes (Herzensteinia microcephalus and Schizopygopsis pylzovi) and found a type of minisatellites in a novel region between the tRNA‐Thr and tRNA‐Pro genes in their mtDNA. To explore the origin and evolution of the minisatellites in different schizothoracine and closely related fishes, we analyzed the available 80 fish mitogenomes which represent five closely related tribes of cyprinine fishes. The results from the phylogenetic analyses show that the schizothoracine fishes sensu stricto is not a monophyletic group and is divided into two clades (Schizothoracini and Schizopygopsini); and the minisatellite is only present in Schizopygopsini distributed in the region between the two tRNA genes (tRNA‐Thr and tRNA‐Pro) of the mtDNA. This is the first record of a minisatellite in a non‐control region of fish mitogenome.
  • Cortisol detection in fish scales by enzyme immunoassay: Biochemical and
           methodological validation
  • Flash photography does not induce stress in the Ram cichlid Mikrogeophagus
           ramirezi (Myers & Harry, 1948) in aquaria
    • Abstract: The Ram cichlid Mikrogeophagus ramirezi (Myers & Harry, 1948) was used to examine whether flash photography can be a stressor for fish in aquaria. The point in time of the highest cortisol concentration in whole‐body homogenates was determined by the temporal course of the cortisol response following air exposure as stressor. Thus, the potential stress response to camera flashlight was examined 22 min after exposure to a single flash and after repeated flashes by applying 10 flashes per minute for 8 hr/day over 2 weeks. In both experiments the stress parameters cortisol and glucose were not increased due to exposure to the flash light. In contrast, after a single flash mean cortisol values tended to be lower and mean glucose values were significantly lower than in the control group, and after repeated flashes mean cortisol and glucose values were significantly lower than in the control group. Furthermore, treated fish showed less intraspecific aggressive interactions. These results can be explained by a possible dazzling or irritation of the fish by camera flashes, thus reducing the natural aggressive behaviour and, consequently, the concentration of stress hormones and mobilisation of glucose. In summary, the physiological stress parameters cortisol and glucose do not reveal that flash photography induces stress in M. ramirezi, and, on the contrary, might even reduce stress effects by lowering intraspecific aggressive behaviour of the fish.
  • Morphology and histochemical analysis of glycoproteins in the digestive
           tract of Dabry's sturgeon
    • Abstract: The aim of this study is to explore the morphology and histochemistry of the digestive tract of Acipenser dabryanus (Duméril, 1869). The digestive system of the Dabry's sturgeon contained an oropharyngeal cavity, esophagus, stomach, pyloric caeca, duodenum, valvula intestine, and rectum. Both the pyloric caeca, and the valvula intestine, which belonged to elasmobranch, were present simultaneously in the digestive system of the Dabry's sturgeon, which indicated that it was an archaic species. According to the results, we found four types of mucous cells exist in the digestive tracts of the Dabry's sturgeon. The statistical results showed that there were various types and densities of mucous cells in different parts. In comparison, large quantities of mucous cells existed in intestines. The difference in type and distribution of mucous cells are closely related to the functions of the organs where they are found; 5‐hydroxytryptamine were used to identify the endocrine cells in the digestive tract of the Dabry's sturgeon.The 5‐hydroxytryptamine immunoreactive cells were distributed throughout the digestive tract except the esophagus.
  • Paddlefish (Polyodon spathula) in Europe: An aquaculture species and a
           potential invader
    • Abstract: The paddlefish (Polyodon spathula) was first introduced to Europe in 1974, mainly due to its potential for rearing in natural polyculture ponds and large temperate reservoirs. The information on the history of paddlefish aquaculture efforts in Europe is scarce, as well as data on current paddlefish aquaculture status and trends. In addition, there is a lack of data on its presence and potential establishment in the wild, while its invasive potential and associated risks and impacts are largely unknown. In order to evaluate its current status in Europe, we conducted a survey among scientists, aquaculture producers and other stakeholders, and reviewed literature and data on the Internet. Based on the results obtained, we discuss the potential and the challenges in European paddlefish aquaculture development, and analyze paddlefish invasive potential and risks associated with its naturalization. Paddlefish aquaculture is well established only regionally in Europe, but offers relatively high potential for further development in pond farms. Nevertheless, future development will require careful planning, especially regarding market development and improved marketing strategies. While paddlefish likely represents a low‐risk invader, improved control and reporting on trade and intentional and unintentional releases will be required. Given the lack of knowledge on potential impacts following its introduction, due caution seems highly advisable.
  • Generation of zebrafish Danio rerio (Hamilton, 1822) transgenic lines
           overexpressing a heat‐shock mediated Gla‐rich protein
    • Abstract: In an effort to provide more information on the function of Grp isoforms in zebrafish, two zebrafish transgenic lines were generated that could conditionally overexpress grp genes. Reported here is the process and strategy used for the generation of these transgenic lines. Overexpression of Grp1 and Grp2 were induced by heat‐shock treatment to investigate their possible roles in the skeleton development. Differences in skeleton development were analysed by alizarin red staining in the larvae. Although no differences in total deformities between wild type and Grp overexpressing larvae were observed, Grp1 and Grp2 overexpressing larvae presented a high percentage of deformities in abdominal and caudal fin vertebra, respectively, with a suggested specific localization of deformities for each isoform.
  • Insights from dietary supplementation with zinc and strontium on the
           skeleton of zebrafish, Danio rerio (Hamilton, 1822) larvae: From
           morphological analysis to osteogenic markers
    • Abstract: In order to obtain additional insights into the zinc (Zn) and strontium (Sr) effects on bone formation, the zebrafish (Danio rerio) was used as a recognized model for vertebrate skeletogenesis. The treatments began 5 days post‐fertilization, using triplicates for each test condition, with 100 larvae per replicate for the strontium trials and 80 larvae per replicate for the zinc trials. Tanks were maintained at 28 ºC with a temperature and photoperiod control (recirculation system ZebTECH, Tecniplast). Diets for the zebrafish larvae undergoing vertebrae formation and mineralization (from 5 to 30 dpf) were supplemented with increasing concentrations of either zinc sulfate or strontium citrate, as sources of Zn or Sr, respectively, and their effects on the fish skeleton were evaluated at both histomorphological and molecular levels. Whereas high amounts of Zn (240 and 480 mg/kg) increased larvae mortality, intermediate amounts (60 to 120 mg/kg) gave similar results as the control diet regarding deformities, suggesting that these amounts are not detrimental to development of the larvae skeleton. In addition, osteogenic markers runx2, sp7 and oc were increased by Zn supplementation, indicating that appropriate amounts of Zn seem to support bone formation in zebrafish larvae. In Sr experiments, two Sr concentrations and two bio‐encapsulation materials were evaluated: chitosan and ĸ‐carrageenan. Interestingly, Sr bio‐encapsulation with chitosan decreased the number of deformed larvae and the number of deformities per larvae at 2500 mg/kg, while ĸ‐carrageenan encapsulation failed to produce any positive effects. Furthermore, the chitosan experimental groups presented an increased expression of the osteoblast differentiation markers, sp7 and oc, suggesting that Sr promotes osteoblast differentiation and bone formation in zebrafish larvae.
  • Gonad maturation and spawning of cobia, Rachycentron canadum (Linnaeus,
           1766) off the Dungun coast, Malaysia
    • Abstract: The reproductive biology of cobia, Rachycentron canadum, from the coastal waters of Dungun, Malaysia was studied from June 2014 to May 2015. From commercial trawls, a total of 201 samples (combined sexes) were collected (fork lengths [FL] 37.5–124.0 cm; body weights 0.5–20.4 g). The overall sex ratio of females to males was 1:0.9, which was not significantly different (χ2 = 2.12, df = 1; p 
  • Length‐weight relationships of three freshwater fish species from the
           Cujubim Sustainable Development Reserve, Amazonas, Brazil
    • Abstract: Length–weight relationships (LWR) were provided for three fish species from Cujubim Sustainable Development Reserve, drainages of the Jutaí River Basin, a tributary of the Solimões River, part of the Central Amazon Biodiversity Corridor, Amazonas, Region North of Brazil. Specimens were collected in March 2006 using gill nets with mesh sizes range between 2 and 18 cm. The LWRs for all species are provided by the first time, and two new maximum length are recorded.
  • Length‐weight relationships for three endemic fish species from the
           upper reaches of the Yangtze River, southwestern China
    • Abstract: Length‐weight relationships (LWRs) were evaluated for three endemic fish species (Sinibrama taeniatus Nichols, 1941; Ancherythroculter nigrocauda Yin & Wu, 1964; and Acrossocheilus monticola Günther, 1888) from the upper reaches of the Yangtze River, southwestern China. Samples were collected using gill nets (25 × 12 m, mesh‐size 2.0 cm) and fishing cages (0.5 × 0.5 × 10 m, mesh‐size 1.0 cm) as well as by electroshock (CWB‐2000 P, 12 V, 250 Hz), from July to September in 2013–2016. Prior to this study, the LWRs for these three species (S. taeniatus, A. nigrocauda and A. monticola) were unknown. In addition, new maximum size for A. nigrocauda and A. monticola were provided.
  • Length–weight relationship of six freshwater fish species in
           upper‐middle Tocantins River basin (Brazil)
    • Abstract: Length–weight relationships (LWRs) were analyzed for six abundant fish species in the upper‐middle Tocantins River, northeastern Brazil. Analyses included data from 486 specimens sampled in five expeditions between August 2013 and May 2015 by gillnets. New maximum values of total lengths for the literature and FishBase were presented for six species, as well as first time estimates of LWR for Galeocharax gulo, Curimata acutirostris and Aphanotorulus emarginatus.
  • Length‐weight relationships for five freshwater fish species from the
           Utinga State Park, Northeast Amazon, Brazil
    • Abstract: Length–weight relationships (LWR) were estimated for five most abundant fish species occurring in the Utinga State Park within the metropolitan area of Belém, State of Pará, Northern Brazil. Data were obtained from specimens of Curimata knerii (n = 75), Gasteropelecus levis (n = 54), Hemigrammus rodwayi (n = 82), Hyphessobrycon bentosi (n = 69), and Pristobrycon calmoni (n = 76) collected in July 2013 with seines (1.5 mm mesh), sieves (1 mm mesh), and gill nets (40–120 mm mesh) in the main waterbodies. All LWRs are novel for science, increasing knowledge on biological information of the Neotropical freshwater fish.
  • Length–weight relationships for four mullets from the Chilika
           lagoon, East coast of India
    • Abstract: Current study provides information on Length–weight relationship (LWR) of four fish species of family Mugilidae i.e., Planiliza macrolepis (Smith, 1846), Chelon parsia (Hamilton, 1822), Osteomugil cunnesius (Valenciennes, 1836) and Valamugil speigleri (Bleeker, 1858) from Chilika Lagoon, East coast of India. Samples were collected during monsoon (July 2016), winter (November 2016) and summer (April 2017) seasons from the fisher's boats inside the lagoon while fishing with screen barrier nets (mesh size 18‐38 mm) and gill nets (mesh size 34, 38, 46, 62 and 86 mm). The b values were determined from the data set in LWRs as 2.958 for P. macrolepis, 2.952 for O. cunnesius and 2.919 for C. parsia and 2.883 for V. peigleri. In all species, regression values were statistically significant (p 
  • Length–weight relationships of two catfish species from the Guareí
           River basin, São Paulo, Brazil
    • Abstract: Here the length–weight relationships (LWRs) of two catfish species are provided. Individuals of Imparfinis mirini Haseman, 1911, and Phenacorhamdia tenebrosa (Schubart, 1964) were collected in August and December 2017 from the Guareí River Basin, upper Paraná River basin, Brazil. Values of b were between 2.66 and 3.11 and a between 0.0122 and 0.0137; statistical analysis showed high r2 values. Lastly, a new record of maximum standard length for P. tenebrosa is provided.
  • Embryology and early ontogeny of an endemic tooth‐carp fish,
           Aphanius sophiae (Heckel, 1847)
    • Abstract: Understanding embryonic development and ontogeny of species is a crucial part of any further biology, ecology and conservation studies. The present study describes the first detailed normal embryonic development of a tooth‐carp, Aphanius sophiae (Heckel, 1847), from fertilization to post‐ hatching. Aphanius sophiae spontaneously spawned at 24 ± 1°C. The newly laid eggs were transparent and spherical (1.45 ± 0.20 mm). We documented developmental times at 24 ± 1°C to egg activation (0.5 hr), cleavage (3 hr), blastula (10 hr), gastrula (20 hr), neurula (24 hr), somite (28 hr), turnover (60 hr), blood circulation (70 hr) and hatching (330 hr). This study contributes to a further understanding of the embryology and the early ontogeny of A. sophiae and may help improve the culture of other threatened species of the genus Aphanius.
  • Reproductive biology of the Brazilian guitarfish, Pseudobatos horkelii
           (Müller & Henle, 1841) from southeastern Brazil, western South Atlantic
    • Abstract: This study provides information on the seasonal occurrence, length‐width relationship, sexual development and size at first maturity of the critically endangered Brazilian guitarfish Pseudobatos horkelii in southeastern Brazil. Samples were obtained from September 2007 to August 2009 from commercial fisheries off São Paulo State coast at depths of 10–50 m, with net mesh sizes of 150 mm in the main net and 100 mm in the cod end. A total of 143 specimens (71 males, 72 females) were analyzed. Total length (TL), disc width (DW), sex and reproductive variables were recorded for each individual. Pseudobatos horkelii presents sexual dimorphism in length‐width relationships, with females attaining larger TL and DW. Females also mature at a larger TL, at 81.1% of the maximum TL, while males mature at 67.8% of the maximum TL. No specimens were captured in winter, and only a small sample size was observed in autumn. Males captured in spring and summer presented semen in the seminal vesicle, indicating that this species may reproduce in the warmer months, as already observed for other Rhinobatidae as well as for P. horkelii in southern Brazil.
  • Length–weight relationships of three freshwater fish species from the
           Kameng River (Brahmaputra basin) in Arunachal Pradesh, northeast India
    • Abstract: Length–weight relationships (LWRs) for three fish species, Psiloryhnchus homaloptera Hora & Mukherji, 1935, Pseudecheneis sulcata (McClelland, 1842) and Devario aequipinnatus (McClelland, 1839), from the Kameng River in Arunachal Pradesh, India were estimated from August 2016 to October 2017. Fishes were collected seasonally using cast nets (2.5 m, 1.2 cm) and electrofishing device (Safari Surveyor, 12 V 7 amp). The b values in the LWRs were determined as 2.98, 2.93 and 2.72 for P. homaloptera, P. sulcata and D. aequipinnatus respectively. The coefficient of determination (r² > .95) for all the species is statistically significant.
  • Length‐weight relationships of two cyprinid fishes from the Beijiang
           River, Guangdong, China
    • Abstract: This study reports the length‐weight relationships (LWRs) of Acrossocheilus beijiangensis Wu & Lin, 1977 and Barbodes semifasciolatus (Günther, 1868) from the upper reaches of Beijiang River, Guangdong Province, China. Sample sizes for the two fish species were 335 for A. beijiangensis and 106 for B. semifasciolatus. Fishes were collected on a monthly basis between November 2013 and December 2014 using gill nets (30 m long × 1.2 m high, mesh‐size 1.5 cm) and fish cages (mesh‐size 0.5 cm). LWRs were established as W = 0.0052L3.3249 (r2 = .9696) for A. beijiangensis and W = 0.0088L3.2405 (r2 = .9469) for B. semifasciolatus. No previous information is available on LWRs for these two species in FishBase.
  • Improved genetic markers for monitoring recruitment dynamics in the
           endangered Mary River cod (Maccullochella mariensis)
    • Abstract: The Mary River cod (Maccullochella mariensis) is a large predatory freshwater fish identified as a potential flagship for freshwater ecosystem conservation in Australia. The species is endemic to the Mary River catchment in eastern Australia, and is listed as Endangered. Previous conservation genetic assessment of Mary River cod was based on a small set of microsatellite loci developed for congeneric Maccullochella species. Here we develop a novel set of 15 microsatellite loci specific to M. mariensis, and demonstrate that these markers exhibit higher variability than those used previously. Mean number of alleles per locus was 4 and mean expected heterozygosity was 0.57. We genotyped 35 Mary River cod larvae belonging to a single cohort using the 15 novel loci and eight previously used loci, and found 10 full‐sib family groups along with clear genetic differentiation between individuals collected from the two sub‐catchments – Tinana Creek and Mary River. Microsatellites presented here will be useful for cost‐effective monitoring of genetic diversity and recruitment dynamics in this endangered fish species.
  • Occurrence of the vulnerable smalltooth sand tiger shark, Odontaspis
           ferox, in the Canary Islands, first evidence of philopatry
  • Reproductive traits of the “ocellated killifish” Floridichthys
           polyommus Hubbs, 1936 (Pisces: Cyprinodontidae) inhabiting estuary of the
           Champotón River (Campeche, Mexico)
    • Abstract: This study explores the reproductive biology and the influence of environmental factors on the reproductive traits of Floridichthys polyommus inhabiting the estuary of the Champoton River. The analysis included population structure, gonadal developmental stages, reproductive period, size at first sexual maturity, fecundity, sex ratio, and somatic indexes. A spatio‐temporal pattern in the distribution of the seven size classes was detected. The species showed a positive allometric growth. Sex ratio was 1.21:1 (females:males). Size at first maturity was 42.23 mm (females) and 47.8 mm (males). A higher absolute and relative fecundity was detected in Puente Champotón estuary (PCH) with lower salinities than those detected in the Delta (DE). The adaptive significance of this trait could be in response to the heavy osmotic constraint imposed by extreme salinities in the DE. Floridichthys polyommus prefers PCH for spawning, and as a result a higher number of ripe individuals was observed in this site, characterized by the highest nutrient levels, which can boost productivity and food availability for fish. Hepatosomatic index was negatively correlated with gonadosomatic index, suggesting energy transfer from the liver towards gamete production. Floridichthys polyommus exhibits an opportunistic strategy (early maturity, small oocytes, small clutches) suggesting that energy is allocated towards reproduction to compensate for the unpredictable hydrological conditions imposed by the estuary (particularly during the hurricane season). Floridichthys polyommus shows a reproductive strategy exhibited by fish living in unstable systems. A seasonal divergence was observed in the reproductive traits of F. polyommus, while differences between study sites were for fecundity.
  • The weight‐length relationship of fish species found in the tidal creeks
           of the Amazon estuary, northern Brazil
    • Abstract: The present study estimated the a and b parameters of the weight‐length relationship of five fish species that inhabit the tidal creeks of islands in the Amazon estuary: Colomesus asellus, Geophagus proximus, Lithodoras dorsalis, Pseudauchenipterus nodosus, Pachypops fourcroi. The species were collected quarterly between October 2013 to July 2014 using block nets made from 20 mm mesh size. The b coefficient of the regression of the weight on the total length of these species ranged from 2.71 to 3.14. These are the first reference on the weight‐length relationship for three species and the new maximum length recorded for two species.
  • Length‐weight and length‐length relationships of three small
           indigenous fishes from the Payra River, southern Bangladesh
    • Abstract: Length‐weight relationships (LWRs) and length‐length relationships (LLRs) for three small indigenous fishes (Esomus danrica, Pachypterus atherinoides and Salmostoma bacaila) were reported from the Payra River, southern Bangladesh. Samples were collected using traditional fishing gear including cast net (mesh size ranges from 1.0 to 2.0 cm), seine net (mesh size ranges from 1.5 to 2.5 cm) and square lift net (mesh size ~ 1.0 cm) in August to September 2017. Allometric coefficient (b) values were 2.66 for E. danrica, 3.08 for P. atherinoides and 3.06 for S. bacaila. The LLRs were also highly significant with r2 ≥ .956.
  • Post‐stocking pallid sturgeon Scaphirhynchus albus growth, dispersal,
           and survival in the lower Missouri River
    • Abstract: Hatchery augmentation has been used to mitigate declines in fish populations worldwide, especially for sturgeon species. Information regarding stocking success including survival, dispersal, and growth of sturgeon post‐stocking may refine sturgeon augmentation programs and facilitate recovery. Pallid sturgeon Scaphirhynchus albus populations have been supplemented by hatchery‐reared stocks for 25 years in the Missouri River, USA. We assessed survival, dispersal patterns, and growth characteristics of post‐stocked pallid sturgeon in the lower Missouri River. Hatchery‐reared pallid sturgeon stocked at age‐1 (4.1%) and > age‐1 (2.9%) were recaptured at a higher frequency than fish stocked at age‐0 (0.3%). Post‐stocking dispersal patterns suggested dispersal range increase as age increased, but individuals tended to remain in the same river segment as their stocking location. Growth rates varied by year class with younger year classes having truncated growth trajectories compared to older year classes. Post‐stock survival of pallid sturgeon varied by age‐at‐stocking and suggest age‐1 survival has declined through time. Augmentation of pallid sturgeon may benefit from considering dispersal from stocking location and by stocking older individuals which appear to have increased survival post‐stocking. A better understanding regarding environmental drivers of growth and specific habitat features used is needed to better predict optimal timing and location of future stockings.
  • Length‐weight relationships of three indigenous fish species from
           National Nature Reserve for Rare and Endemic Fishes of the upper Yangtze
           River, China
    • Abstract: Length‐weight relationships (LWRs) were estimated for three small indigenous fish species, (Sinogastromyzon szechuanensis, Sinogastromyzon sichangensis and Sinocrossocheilus labiatus) in the upper Yangtze River, China. Samples were collected using three types of local traditional fishing gears, including gill nets (mesh size: 1 cm), fish cages (mesh size: 0.5 cm), and electrofishing techniques (CWB‐2000 P, 12V, 250 Hz), in April, July and October 2013 and 2014, and April and October 2016. The sample size for each species were gathered separately, with 100 for S. szechuanensis, 381 for S. sichangensis and 49 for S. labiatus from National Nature Reserve for rare and endemic fishes of the upper Yangtze River, China. The length‐weight relationship parameter values of b were calculated as 2.986 for S. szechuanensis (b: 2.854–3.118), and 3.284 for S. sichangensis (b: 3.209–3.359) and 3.119 for S. labiatus (b: 2.911–3.326). The primary data will be meaningful for further research about sustainable development and scientific management of fishery resources of the upper Yangtze River.
  • Length–weight relationships of four marine fish species in Motaf fishing
    • Abstract: This study presents the length–weight relationships (LWRs) of four caught fish, including Drepane punctata (Linnaeus, 1758), Alectis indica (Rüppell, 1830), Argyrops spinifer (Forsskål, 1775), and Saurida tumbil (Bloch, 1795). During 27 tows, the fish specimens were captured by Cutlassfish trawl net, with 80 mm mesh size in the cod‐end, from March 2015 to April 2016. The fishing operation was conducted at depths more than 50 m in southern waters of Bushehr (the northern Persian Gulf). The estimated b values were as follow: 3.17 for D. punctata, 2.59 for Alectis indica, 2.56 for A. spinifer, and 3.26 for S. tumbil. In the present study, new maximum total lengths for D. punctata (15.2–43.5 cm), A. indica (21–69.5 cm), and A. spinifer (15.3–66.5 cm) were reported in comparison with previous researches.
  • Viable diploid progeny induced from sperm of Chinese tetraploid pond loach
           by cold‐shock androgenesis
    • Abstract: Natural tetraploid loach (Misgurnus anguillicaudatus) living in the Changjiang River basin and adjacent area in China has been considered a true genetic tetraploidy (4n = 100) with four sets of homologous chromosomes. Here, we reported its further supporting evidence provided by the cold‐shock androgenesis. Viable androgenetic progeny appeared when eggs were cold‐shocked at 3°C for 60 min, starting 5 min after fertilization with sperm of natural tetraploid males, although the survival rate was significantly lower than control group. The majority (87%) of androgenetic embryos were diploid (2n = 50) and all‐paternal inheritance was verified in larval stage by microsatellite genotypes. Microscopic observations confirmed the elimination of both egg nucleus and second polar body from a fertilized egg, followed by the cleavage exclusively with sperm nucleus. Thus, the appearance of normal diploid androgenetic progeny from sperm of natural tetraploid loach revealed the presence of four chromosome sets in tetraploid males.
  • Length‐weight relationships of eight fish species from mangroves of
           Guangdong, China
    • Abstract: The length‐weight relationships were determined for eight fish species [Zebrias zebra (Bloch, 1787); Zebrias quagga (Kaup, 1858); Amblyotrypauchen arctocephalus (Alcock, 1890); Gerres japonicus Bleeker, 1854; Apogonichthyoides pseudotaeniatus (Gon, 1986); Setipinna tenuifilis (Valenciennes, 1848); Bregmaceros rarisquamosus Munro, 1950; Bregmaceros nectabanus Whitley, 1941] belonging to six families. Fish samples were collected using gillnets (20 × 10 m, mesh size 0.5 cm) and cage net (200 × 10 × 15 cm, mesh size 0.5 cm) from mangroves of Guangdong, China. Samples were collected quarterly from June 2015 to March 2017.The allometric coefficient (b) of length‐weight relationship varied from 2.76 for Zebrias zebra to 3.38 for Setipinna tenuifilis. Length‐weight relationships for these 11 fish species were determined for the first time.
  • Effects of crayfish density, body size and substrate on consumption of
           lake sturgeon (Acipenser fulvescens Rafinesque, 1817) eggs by invasive
           rusty crayfish [(Orconectes rusticus (Girard, 1852)]
    • Abstract: The density and size of benthic predators such as crayfish and the physical characteristics of aquatic habitats including benthic substrate size have been hypothesized to significantly affect levels of lake sturgeon (Acipenser fulvescens) egg consumption. The invasive rusty crayfish (Orconectes rusticus) was used to quantify consumption and apportion variation in egg loss in an experimental setting. Experiments consisted of large flow‐through rectangular tanks (0.8 m wide, 2.96 m2 total bottom surface area) receiving river water to mimic natural diel temperature regimes. Four crayfish densities were tested (5, 10, 15, 30 individuals or 1.7, 3.4, 5.1, 10.1 individuals/m2) that span the range of densities observed in natural settings. Crayfish were allowed to freely move among three substrates commonly found at spawning locations where lake sturgeon eggs are deposited (cobble, gravel and sand). After an acclimation period (15 min), 200 lake sturgeon eggs were randomly scattered over each substrate category (600 eggs per tank). Mean (± SE) egg consumption over 48 hr was 80 ± 3% (range 19–100% across 16 replicate trials). Egg consumption increased significantly as a function of increasing crayfish density. The effect of substrate size, however, depended significantly on crayfish density (substrate size × predator density interaction). Egg consumption significantly increased as substrate size decreased (e.g. from gravel to sand), at both high and low crayfish densities. Egg consumption also increased with increasing mean crayfish body size. Our results revealed that levels of lake sturgeon egg consumption by rusty crayfish are high in some settings. Further work is needed to determine if egg consumption in natural river settings is similarly high and whether egg consumption by crayfish and other egg predators could negatively affect population levels of recruitment.
  • Exploitation of paddlefish Polyodon spathula (Walbaum, 1792) in the
           Mississippi River
    • Abstract: Concern over exploitation rates of the American paddlefish Polyodon spathula from sport and commercial fisheries has increased in recent decades and the Convention on International Trade of Endangered Species is now seeking information from state agencies regarding the sustainability of commercially harvested paddlefish populations. The Missouri Department of Conservation is addressing this through the implementation of a 5‐year tagging study on exploitation of paddlefish in the Mississippi River. The first 2 years of this project found that minimal exploitation of paddlefish along Missouri's eastern border was equal to 4.01% (SE = 0.02). After updating previously constructed spawning potential ratio modeling completed in 2016 with the more accurate estimates of exploitation determined in this study it becomes apparent that paddlefish populations of the Mississippi River are currently at sustainable levels. However, precautionary adjustment of regulations is advised to protect paddlefish through maturation and to counteract the possibility of increased harvest intensity resulting from increased demand of domestic caviar.
  • Biometric relationships between body and otolith measurements in nine
           demersal fishes from north‐eastern Tasmanian waters, Australia
    • Abstract: Relationships between fish and otolith measurements were analyzed in nine demersal fishes from the north‐eastern Tasmanian waters: Foetorepus calauropomus, Trachurus declivis, Parequula melbournensis, Neosebastes scorpaenoides, Platycephalus aurimaculatus, Platycephalus bassensis, Platycephalus conatus, Lepidotrigla mulhalli and Lepidotrigla vanessa. The values of exponent b from the relationships between fish weight and fish total length, total length and otolith length, total length and otolith width, and fish weight and otolith length were estimated. All above relationships were statistically significant. The analysis of covariance (ANCOVA) was used to test the effect of the categorical factor of species in the fish length and otolith length relationship. Significant differences in fish length and otolith length relationship between species were highlighted in both gurnards and flatheads. Results from this study will provide novel information on quantitative biometric relationships between body and otolith measurements of fish species in Australian waters.
  • Length–weight and length–length relationships of three fish species
           from the Heihe River, northwest China
    • Abstract: Length‐weight (LWRs) and length–length (LLRs) relationships are reported for three fish species belonging to two families and two genera from the Heihe River, northwest China. Fish samples were collected using trap nets (mesh size 1 cm) in May and December of 2016, and April and October 2017. Standard length (SL) and total length (TL) for each individual were measured to the nearest 0.1 cm by digital slide caliper and each body weight (BW) was measured to an accuracy of 0.1 g using digital balance. The b‐values for LWRs varied from 2.580 to 3.164 (r2 > .956). The results further indicated that the LLRs were highly correlated (r2 > .991; p 
  • An approach for assessing paddlefish Polyodon spathula (Walbaum, 1792)
           populations using mark‐recapture information
    • Abstract: Historically, management of fish populations has been achieved through the use of age‐derived estimates of growth and mortality. For long‐lived species such as the paddlefish, Polyodon spathula, the validation of calcified structures is necessary to correct for the presence of false annuli or the absence of growth rings. Regardless, numerous studies on paddlefish populations throughout their range have continued the use of un‐validated age estimates to evaluate dynamic rate functions. The use of mark‐recapture studies has been applied widely to evaluate growth of short‐lived fishes, but only recently to a few long‐lived freshwater fishes (i.e. white sturgeon, shovelnose sturgeon, and pallid sturgeon). This study provides the first simultaneous evaluation of both mark‐recapture and age‐estimate information in determining population characteristics for paddlefish. In doing so, this study has determined that the P. spathula population in the Black River below Clearwater Dam, Missouri is sustainable. Additionally, mark‐recapture information is sufficient to produce accurate and reliable assessments of paddlefish populations in lieu of validated aging structures; future management should be centered on accurate scientific methods, which is not the case when using un‐validated aging structures (e.g. scales, otoliths, fin rays, dentary bones) to determine population parameters. Mark‐recapture information can provide an accurate, alternative source of growth and mortality information for use in evaluating and managing paddlefish populations throughout their range.
  • Coastal streams constitute alternative habitats for juveniles of an
           overexploited mullet species
  • Length rather than year‐round spawning, affects reproductive performance
           of RAS‐reared F‐generation pikeperch, Sander lucioperca (Linnaeus,
           1758) – Insights from practice
    • Abstract: The continuous production of large numbers of high quality gametes is essential for aquaculture, particularly in candidate species, such as pikeperch, Sander lucioperca (L.). The common practice of year‐round reproduction is under suspicion of inflicting adverse effects on the quality of the gametes through the disturbance of endogenous rhythms. We hypothesized that such perturbation does not affect RAS‐reared F‐generation broodstock. Reproductive performance (number of eggs) and gamete quality (fertilization and hatching rate) were assessed over the course of 3 years covering six independent, photothermal shifted spawning seasons in a commercial pikeperch hatchery (n = 31 egg batches of F‐generation fish in total). No substantial differences in fertilization or hatching rates could be detected between the individual spawning seasons. Fecundity varied, but there are indications for a size effect on female fecundity with intermediate sized females producing higher number of eggs (~65–70 cm). Low egg quality could be detected in batches of very large fish. In conclusion, size‐specific broodstock composition, but not year‐round reproduction of F‐generation pikeperch spawners affects the reproductive performance.
  • Length–weight Relationships of four marine fish species in the Gulf
           of Oman (Konarak, Iran)
    • Abstract: Length–weight relationships were estimated for four marine species, namely Pomadasys kaakan (Cuvier, 1829), Pampus argenteus (Euphrasen, 1788), Scomberoides commersonnianus Lacepède, 1801 and Euthynnus affinis (Cantor, 1849) in the Gulf of Oman (Konarak, Iran). During nine cruises, samples were collected at 20‐miles distance from shoreline by 3 panel drift gill‐nets with 120 mm mesh size, 8–9 m height and 0.5 hanging ratio in autumn and winter 2016.
  • Reach specific use of spawning habitat by adult green sturgeon (Acipenser
           medirostris) under different operation schedules at Red Bluff Diversion
    • Abstract: Mature green sturgeon, Acipenser medirostris, enter rivers along the western coast of North America in late winter to late spring and migrate upriver to spawning sites. After spawning, they may leave the river or spend the summer and autumn holding in deep pools before departing from the river with the onset of winter rains. Evidence exists that the seasonal Red Bluff Diversion Dam (RBDD) was an obstacle to the upriver migration of green sturgeon in the Sacramento River in Central California. We compared the migratory movements of green sturgeon under three different dam operation schedules, including post‐decommissioning, to assess the impact of this management action. The proportion of green sturgeon carrying acoustic transmitters that moved above the RBDD was higher when the gates were closed on June 15, one month later than the historical closure date of May 15, and increased again after the dam was decommissioned. The application of statistical analyses (generalized linear and additive mixed models) to the detection records of green sturgeon highlighted an improvement in connectivity after dam decommissioning. The data also indicate that interannual variation in river condition is an important driver of sturgeon presence on the spawning grounds.
  • Length‐weight relationship models of two tropical shads, Tenualosa
           macrura (Bleeker, 1852) and Tenualosa toli (Valenciennes, 1847) in the
           coastal waters of Sarawak, Malaysia
    • Abstract: This study investigates length‐weight and length‐length relationships of two species of the tropical shads, Tenualosa macrura (Bleeker, 1852) and Tenualosa toli (Valenciennes, 1847) collected from the coastal waters of Sadong (1°30′59.4”N and 110°44′46.4”E) and Sebuyau (1°31′26.8”N and 110°58′05.8”E), Sarawak, Malaysia. The fish were captured using gill nets (mesh size range 5–12 cm) operated by mechanized boat along the coast of Sadong and Sebuyau, Sarawak. Relative growth coefficient (b) was 2.942 and 3.408 for males and females of T. macrura while 2.909 and 3.178 for males and females of T. toli. All LWRs were significant (p 
  • Age, growth and maturity of tub gurnard (Chelidonichthys lucerna Linnaeus
           1758; Triglidae) in the inshore coastal waters of Northwest Wales, UK
    • Abstract: The tub gurnard Chelidonichthys lucerna has been identified by ICES as a potential commercial species in the northeast Atlantic with recommendations made to monitor landings and discards and to derive information on population biology for stock assessment purposes, however, data are lacking for the species in the northeast Atlantic. Therefore, aims of this study were to provide data on the size/age‐structure and patterns of growth, maturity and mortality of C. lucerna in Northwest Wales, UK, and in doing so to provide data on the biological characteristics of the most northerly population studied to date for comparison with the existing data for southerly Mediterranean populations. Data on the age, growth and maturity of C. lucerna were collected by otter trawling (73 mm cod‐end stretched mesh size) in the coastal waters of Northwest Wales, UK in October (2000–2011, excluding 2006). Total length (TL) of fish sampled ranged between 10.5–41.0 cm (males) and 10.4–57.5 cm (females). The majority of the female fish were between 20–30 cm TL (60.2%) and the majority of the male fish between 20–30 cm TL (58.3%) respectively. TL/weight (W) relations for male and female fish were similar and the combined data was described by W = 0.0067 TL3.10. Age of fish ranged between 1–7 years old for female fish and 1–5 years old for male fish respectively with the majority of female fish 3 years old (40%) and the majority of male fish 3 years old (37%). The age structures of female and male tub gurnards were not significantly different with the older age classes consisting predominantly of female fish. Both males and females exhibited similar asymptotic growth patterns and the combined von Bertalanffy growth function was TLt = 51.6 (1 − e [−0.25(t + 0.41)]). Instantaneous rates of total mortality were calculated as 1.04 year−1 for males and 1.11 year−1 for females. The size (L50) and age at first maturity (A50) were estimated to be 29.1 cm TL and 2.8 years for males, 27.7 cm TL and 2.7 years for females and 28.0 cm TL and 2.8 years for both sexes combined. The results of this study provide the first information on the biology and population dynamics of C. lucerna in the Irish Sea, the first data collected in the northeast Atlantic since 1985 and the most northerly population studied to date.
  • Development of an alternative ageing technique for blue shark (Prionace
           glauca) using the vertebra
    • Abstract: Accurate determination of age is essential for the comprehensive assessment and management of exploited shark populations. Enhancement of growth bands is necessary to accurately and efficiently determine age. However, most traditional techniques do not describe an efficiency of a series of procedures and the detailed protocol for different‐sized sharks. We describe a simple and highly successful technique for ageing vertebrae of blue shark (Prionace glauca) that we refer to as “burn method”, derived from the “break and burn method” and “shadowing method”—a simple procedure requiring an alkaline treatment to clean the vertebral centra and a burning treatment to enhance growth band visualization. We described optimal times for sharks of precaudal length of 50, 100, 150, and 200 cm as 44.9, 88.7, 134.0, 183.5 s of alkaline treatment, and 6.8, 8.9, 10.2, and 11.5 min of burning treatment; both longer and shorter exposure times resulted in higher failed sample frequencies. Using our burn method, it is possible to do ageing a sample from a wide angle, with the reader able to obtain information on growth bands from different perspectives. To critique different technique efficiencies, the index of average percent error (IAPE) and mean coefficient of variation (CV) are compared for independent readers using the burn method and other techniques (silver nitrate impregnation and the unstained shadowing methods). The precision of the burn method (IAPE, 4.1%; CV, 5.7%) was similar to that of silver nitrate impregnation (IAPE, 5.8%; CV, 8.2%) and unstained shadowing method (IAPE, 8.3%; CV, 11.8%). For younger specimens, the IAPE and CV of the burn method were lower than those of the other techniques, but, compared with other ageing methods, precision decreased for older sharks. We demonstrate that the burn method to be accurate for age determination of blue sharks, especially for specimens with less than 10 bands, but recommend simultaneous use of other methods, such as thin sectioning (the most common for structure‐based ageing) and bomb carbon dating, to accurately determine the age of older individuals.
  • Maximum length and age report of Sparus aurata (Linnaeus, 1758) in the
           Black Sea
    • Abstract: The presence of gilthead sea bream (Sparus aurata) in the Black Sea, albeit sparse, has been known for many years. In recent years, it has been encountered in fishing nets, most commonly as by‐catch. In this study conducted in the southern Black Sea (Ordu) region, three female individuals were caught in trammel nets on October 9, 2017, and the largest individual was found to have a total length of 61.4 cm, a weight of 3080.6 g, and a gonad weight of 115.59 g. The metric and meristic characteristics of the largest individual sampled were also determined.
  • Sinocyclocheilus zhenfengensis, a new cyprinid species (Pisces: Teleostei)
           from Guizhou Province, Southwest China
    • Abstract: Sinocyclocheilus zhenfengensis sp. nov. is a new species from an underground water environment in a karst cave located in Beipanjiang River of the Pearl River Basin in Shuangrufeng (Double Breasts Hill) Scenic, Etian Village, Zhexiang Township, Zhenfeng County, Guizhou Province, Southwest China. The new species has eyes, its body is completely scaled, an anteriorly directed bulge has formed on the back of its head, and a long pectoral fin exceeds the pelvic fin insertion. The body of the new species is apparently similar to that of S. bicornutus, but differs in scale rows above the lateral line, scale rows below the lateral line, snout length, and eye diameter. Phylogenetic reconstruction of the cytochrome b gene using the maximum parsimony (MP) and Bayesian inference (BI) methods indicates that S. zhenfengensis is closely related to S. bicornutus, S. tianeensis, S. jiuxuensis, and S. altishoulderus; however, it differs in terms of eye size, lateral line scales, scale rows above and below the lateral line.
  • Partitioning kin groups of broodstock in the critically endangered Chinese
           sturgeon, Acipenser sinensis Gray 1835
    • Abstract: Pedigrees of broodstock with unknown relationship of the critically endangered Chinese sturgeon, Acipenser sinensis, was evaluated using microsatellite markers to facilitate genetic management in restocking programs with small broodstock size. We characterized the distributions of relatedness values to reconstruct kin groups in four hatchery families with known pedigrees using microsatellites. The distributions of relatedness values for kin classes were used for partitioning full sibling groups of wild A. sinensis broodstock kept in two hatcheries, resulted in 13 full sibling clusters, four of which containing 62% of all the wild individuals. This indicates high probability of choosing close related breeder pairs in random mating, thus selective breeding is necessary to minimize inbreeding and maintain genetic diversity. This study provides a useful tool for genetic management in conservation programs of A. sinensis in aim of preserving self‐sustained wild populations.
  • Length‐length and length‐weight relationships for four fish species
           from Naolihe National Nature Reserve, Heilongjiang, China
    • Abstract: In this study the length‐length and length‐weight relationships for four fish species from Naolihe National Nature Reserve in China belonging to three families and four genera were analyzed. They are Perccottus glenii Dybowski, 1877; Rhodeus sericeus Pallas, 1776; Cobitis lutheri Rendahl, 1935; and Misgurnus mohoity Dybowski, 1869. Fish samples were collected in May 2017 from Naolihe National Nature Reserve by fish catching cage (31*41 cm caliber, 16 m length, 3–5 mm mesh diameter), and identified as to species in the laboratory according to S. Q. Zhu (Synopsis of freshwater fishes of China, Jiangsu Science and Technology Publishing House, Nanjing, China, 1995).
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