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BIOLOGY (1427 journals)

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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  [1579 journals]
  • Length-weight relationship of six fish species from Geum, Nakdong and
           Yeongsan rivers, South Korea
    • Authors: Md. Mamun; Y.-J. Lee, K.-G. An
      Abstract: Length-weight relations (LWR) of six fish species from Geum, Nakdong and Yeongsan rivers in South Korea was estimated. A total of 5,152 specimens were measured and weighed. The linear relationship of total length and total weight were highly correlated for all species. No previous information on LWRs on Rhinogobius brunneus species were found in Fishbase.
      PubDate: 2017-07-14T06:19:39.405405-05:
      DOI: 10.1111/jai.13431
       
  • Length–weight and length–length relationships of five fish species
           from the Dadu River and its tributaries, southwest China
    • Authors: Zhiming Zhang; Wenjun Wang, Feng Chen, Zhengqing Yang
      Abstract: Length-weight (LWRs) and length–length (LLRs) relationships are reported for five fish species belonging to two families and five genera from the Dadu River and its tributaries, southwest China. In total, 605 specimens were collected by electrofishing and gillnets (mesh size ranging from 1.5 to 3.5 cm) in May and October 2013, May and October 2014, May and November 2015, and April and October 2016. The b-values for LWRs varied from 2.571 to 2.952 (r2 > .915). The results further indicated that the LLRs were highly correlated (r2 > .978; p 
      PubDate: 2017-07-14T02:55:19.360648-05:
      DOI: 10.1111/jai.13435
       
  • Collapse of Lake Whitefish Coregonus clupeaformis (Mitchill, 1818) species
           pair in Como Lake, Ontario
    • Authors: S. M. Reid; M. Parna, J. D. Reist
      Abstract: Lake Whitefish (Coregonus clupeaformis) species pairs exist in a small number of northern temperate lakes in North America. Sympatric populations of dwarf and normal-sized whitefish represent a continuum of morphological and genetic divergence among these lakes. In this study, we used morphological and age data to assess the status of the Lake Whitefish species pair in Como Lake, Ontario (Canada). Whitefish were collected with gill-nets from spawning shoals during the fall of 2012 and 2014 and compared with archived (circa 1989) dwarf and normal-sized specimens. Our study indicates that the two previously collected forms have been replaced by a single form with a different morphology and age structure. In comparison to archived specimens, contemporary Lake Whitefish were larger, deeper-bodied and older; with more gill rakers, lateral line scales, smaller eyes and a wider interorbital width. We hypothesize that the recent invasion of Como Lake by Spiny Waterflea (Bythotrephes longimanus) has affected whitefish growth rates and changed the ecosystem conditions that previously maintained the species pair.
      PubDate: 2017-07-08T02:05:26.051064-05:
      DOI: 10.1111/jai.13429
       
  • Reproductive biology of Pethia ticto (Cyprinidae) from the Gorai River (SW
           Bangladesh)
    • Authors: M. Y. Hossain; M. A. Hossen, M. S. Islam, S. Jasmine, F. Nawer, M. M. Rahman
      Abstract: Some aspects of reproductive biology of Pethia ticto (Hamilton, 1822) from the Gorai River of southwestern (SW) Bangladesh were investigated by regular monthly samples for a period of one year during July 2010 to June 2011. A sum of 1200 specimens (male = 454 and female = 746) were collected using cast net, lift net and conical trap. Total length (TL) and Body weight (BW) were measured with slide caliper and digital balance, respectively for each individual. Based on gonadosomatic index (GSI), modified gonadosomatic index (MGSI) and Dobriyal index (DI) first sexual maturity was 4.30 cm TL for male and 4.80 cm TL for female. Also, on the basis of higher values of GSI, MGSI and DI spawning season was ranged from April to September for P. ticto in the Gorai River ecosystem. The fecundity was ranged from 2230–8450 with a mean value of 4779 ± 1578. In addition, there was a significant relationship between total length and fecundity (r2 = .931, p 
      PubDate: 2017-07-07T01:05:44.747619-05:
      DOI: 10.1111/jai.13427
       
  • Nonlethal sampling for stable isotope analysis of juvenile Chinese
           sturgeon (Acipenser sinensis): Comparing δ13C and δ15N signatures in
           muscle and fin tissues
    • Authors: S. K. Wang; C. Xu, Y. Wang, G. Yang, T. T. Zhang, F. Zhao, P. Zhuang
      Abstract: We compared δ13C and δ15N values of muscle with fin from juvenile Chinese sturgeon (Acipenser sinensis), to evaluate the feasibility of using nonlethal (fin) as an alternative to lethal (muscle) sampling. Size and lipid effect on the relationship between fin and muscle were also investigated. Dorsal muscle (DM) and fin clip (FC) were collected from A. sinensis with different body length (120–373 mm) in the Yangtze Estuary for isotope analysis. The result showed that (1) muscle isotope values could estimated by the values of fin, from either use the regression model (δ13CDM = 0.939 × FC − 2.577; δ15NDM = 0.737 × FC + 4.638) or constants factors (δ13CDM = δ13CFC − 1.27; δ15NDM = δ15NFC + 0.59); (2) no size-based relationships with δ13C and δ15N from either fin or muscle; (3) lipid extraction significantly improving the fin and muscle regression model fit for both δ13C and δ15N values. Therefore, this study support the use of nonlethal fin tissues for isotope analysis of juvenile A. sinensis, and will allow trophic studies to avoid the effect of lipid accumulation from muscle.
      PubDate: 2017-07-05T03:25:54.606672-05:
      DOI: 10.1111/jai.13433
       
  • Identification of a sex-specific molecular marker in Salminus brasiliensis
           (Characiformes) based on SCAR marker
    • Authors: L. De Rosa; V. P. Cruz, E. A. Serrano, N. J. Mendes, A. P. Wasko, J. A. Senhorini, B. G. Pardo, P. Martínez, C. Oliveira, F. Foresti
      Abstract: Salminus brasiliensis, a characin regionally named ‘dourado’ (meaning goldfish), is the biggest characid fish, this species is cited in a list of fishes that are vulnerable. The goal of the present work was to try to identify, through AFLP technique to convert them into single locus markers (SCARs), in order to improve the sex identification in S. brasiliensis. Between possible sex-specific AFLP markers in this study, one male-specific were isolated (Les1) and converted into a SCAR marker. Les1 marker was confirmed sex-specific in all samples tested. A sex-specific DNA marker applicable to fish would be very useful for elucidating sex determination mechanism in fish.
      PubDate: 2017-07-05T03:25:20.982213-05:
      DOI: 10.1111/jai.13430
       
  • Mass-marking of farmed European eels (Anguilla anguilla (Linnaeus, 1758))
           with alizarin red S
    • Authors: B. Kullmann; R. Neukamm, R. Thiel
      Abstract: The Working Group on Eel of the International Council for the Exploration of the Sea (ICES) regularly reports that a significant amount of stocked eels in Europe was pre-grown in aquaculture farms prior to stocking—so called “farmed eels.” The ICES advices chemical marking of stocked recruits to ensure their traceability throughout all life stages. To date, however, there was a lack of knowledge concerning the most suitable chemical substance and its application on farmed eels. The aim of this study was to fill this gap by presenting successful attempts of marking those eels with alizarin red S (ARS). An ARS concentration of 150 mg L−1 buffered with 150 mg L−1 Tris(hydroxymethyl)aminomethane applied as an immersion bath over 9 h was sufficient to mark a total of 3572 kg of farmed eels (6.5–8.0 g mean body weight). The marking success was 100% on otoliths and highest stocking density of up to 67.1 kg m−3 (corresponding 54.0 kg m−2) turned out to have no effect on mortality which was consistently below 1%.
      PubDate: 2017-07-03T03:45:26.891255-05:
      DOI: 10.1111/jai.13424
       
  • Length–weight relationships of four marine fish species caught in
           the South China Sea
    • Authors: Z.-L. Li; G. Hou, Y.-R. Yan, B. Feng, H.-S. Lu
      Abstract: Length–weight relationships are described for four marine teleost fish species caught in the South China Sea. A total of 625 individuals were collected from April to August 2007 and November 2012 using a bottom trawl (mesh size, 3.9 cm) and longline fishing. The values of parameters a and b ranged from 0.004612 to 0.02137 and 3.019 to 3.371, respectively. The high r2 values (all >.950) indicate that these relationships are robust and will be appropriate for use in fisheries management of these species.
      PubDate: 2017-07-02T23:45:49.033745-05:
      DOI: 10.1111/jai.13399
       
  • Silver eel, Anguilla anguilla (Linnaeus, 1758), migration patterns in
           lowland rivers and lagoons in the North-Eastern region of their
           distribution range
    • Authors: J. Dainys; S. Stakėnas, H. Gorfine, L. Ložys
      Abstract: Escapement success and migration patterns of silver eels Anguilla anguilla (L.) was studied by acoustic telemetry in three natural free-flowing and one dammed river and in Curonian Lagoon in Lithuania. Mean downstream migration speed and escapement success were almost the same in the shorter 210 km dammed river (52%, 13.6 km/day) and the considerably longer 300–480 km free-flowing rivers (53%, 10.7 km/day). Despite the similarity between migration speed in the Curonian Lagoon (14.6 km/day) to that in rivers, migration success was significantly higher (71%) in the Lagoon. Although a majority of silver eels in Lithuania start migrating downstream in spring, the peak of eel migration into the Baltic Sea was observed during late fall. Overall migration success in the rivers and the Lagoon was 35%. Relatively low escapement may have negative consequences on the success on eel stock restoration and must be addressed when strategically planning for the production of spawners.
      PubDate: 2017-07-02T23:45:47.535788-05:
      DOI: 10.1111/jai.13426
       
  • Identification of larval fish in mangrove areas of Peninsular Malaysia
           using morphology and DNA barcoding methods
    • Authors: I. A. Azmir; Y. Esa, S. M. N. Amin, I. S. Md Yasin, F. Z. Md Yusof
      Abstract: The identification of larval fish has been an important morphological issue in marine biology due to the dramatic transformations that most species undergo from early larval stages to adulthood. Insufficient morphological diagnostic characters in larval fishes made it easy to misidentify them and a difficult process to key to genus and species level. The experiment aims to find out, by applying DNA barcoding, how consistent the morphological identifications can be among larval fish. Larval fish were mainly collected using plankton nets around mangrove areas in Pendas (Johor), Setiu (Terengganu), Pekan (Pahang) and Matang (Perak) Malaysia between April 2015 and October 2015. A total of 354 samples were morphologically identified, mostly to the family level and a few to the genus level. Larval fish ranged from 1.5 mm to 31 mm of total length, with the most abundant individuals being
      PubDate: 2017-07-02T23:45:30.44912-05:0
      DOI: 10.1111/jai.13425
       
  • Hematological effects of transportation stress on Atlantic sturgeon
           Acipenser oxyrinchus Mitchill L. 1815
    • Authors: A. Pilinkovskij; M. Z. Vosylienė, N. Kazlauskienė, J. Jakubauskaitė
      PubDate: 2017-07-02T23:45:20.171895-05:
      DOI: 10.1111/jai.13402
       
  • Length–weight relationships for seven fish species of the Napo
           River, Upper Amazon, Peru
    • Authors: J. R. Garcia-Ayala; E. M. Brambilla, G. S. David, R. C. Benine, H. Sanchez
      Abstract: Length–weight relationships (LWR) were estimated for seven fish species from the Napo River and its main tributaries, Arabela and Curaray rivers, Amazon basin, Peru. A total of 652 specimens were sampled between 2012 and 2014 using seines and gillnets. This study reports new maximum total length for four species and new LWR and maximum total weight records for three and five species, respectively.
      PubDate: 2017-06-28T23:30:26.013123-05:
      DOI: 10.1111/jai.13428
       
  • Size–weight relationships of batoids captured by artisanal fishery in
           the southern Gulf of California, Mexico
    • Authors: N. R. Ehemann; X. A. Pérez-Palafox, P. Mora-Zamacona, M. I. Burgos-Vázquez, A. F. Navia, P. A. Mejía-Falla, V. H. Cruz-Escalona
      Abstract: This study reports the size–weight relationships (SWR) for nine batoid species that are frequently fished by the artisanal fisheries in the southern Gulf of California. Analysis included a total of 2,012 specimens, caught from October 2013 to July 2016. The slope values (b) oscillated from 2.80 to 3.56. Growth was isometric for five species and positively allometric for four. There were differences in SWR between sexes for three species being in all cases the female greater and heavier than males. This is the first analysis of SWR for the batoid species studied in the Gulf of California.
      PubDate: 2017-06-22T23:36:11.923624-05:
      DOI: 10.1111/jai.13421
       
  • Length–weight and length–length relationships of 16 fish species from
           Amapá, Brazilian Amazon
    • Authors: A. B. Nobile; D. Freitas-Souza, F. P. Lima, L. B. Vieira, B. F. Melo, C. Oliveira
      Abstract: The present study provides length-weight (LWR) and total length-standard length (LLR) relationships for 16 freshwater fish species collected in coastal rivers of the northern Brazilian, state of Amapá in 2015. Fishes were caught in heterogenic environments like ponds, stream and river channel with sieve and trawl. As result, we present novel information of LWR and LLR for 11 and 15 species, respectively. Maximum values (first values or new maximum values) of TL, SL and WT are presented for 14, 12 and 15 species, respectively.
      PubDate: 2017-06-19T23:45:25.867516-05:
      DOI: 10.1111/jai.13423
       
  • Mortality of Baltic sea trout (Salmo trutta) after release from gillnets
    • 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.
       
  • Length‐weight relationship and relative condition factor of five
           indigenous fish species from Torsa River, West Bengal, India
    • 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.
       
  • 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
    • 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.
       
  • Habitat associations of shovelnose sturgeon Scaphirhynchus platorynchus
           (Rafinesque, 1820) in the lower Platte River, Nebraska
    • 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.
       
  • Length‐weight relationships of nine fish species from the Qingjiang
           River, Yangtze River basin, China
    • 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).
       
  • Are shovelnose sturgeon a valid diet surrogate for endangered pallid
           sturgeon during the first year of life'
    •  
  • Length–weight and length–length relationship of Thryssa purava
           (Hamilton, 1822), Thryssa polybranchialis Wongratana, 1983 and Thryssa
           mystax (Bloch & Schneider, 1801) from Chilika lagoon, India
    • Abstract: Current study provides basic information on Length–weight relationship (LWR) and length‐length relationship (LLR) of three fish species of genus Thryssa (Clupeiformes: Engraulidae) i.e., Thryssa purava (Hamilton, 1822), Thryssa polybranchialis Wongratana, 1983 and Thryssa mystax (Bloch & Schneider, 1801) from Chilika Lagoon, India. Samples were collected during the monsoon (July) and post‐monsoon (November) seasons in 2016 and during the pre‐monsoon season (May) in 2017, using screen barrier nets (mesh size 8–18 mm) and gill nets (mesh size 14 and 16 mm). The b values were determined from LWRs as 3.026 for Thryssa purava, 3.326 for Thryssa polybranchialis and 3.081 for Thryssa mystax.
       
  • Multiple origins of stone loach, Barbatula barbatula (Teleostei:
           Nemacheilidae), in Sweden based on mitochondrial DNA
    • 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.
       
  • Length‐weight relationships of seven fish species from Jequitinhonha
           River basin, southeastern Brazil
    • Abstract: The present study established the length‐weight relationships (LWR) for seven fish species from Jequitinhonha River basin, a Brazilian coastal drainage, collected with gillnets (3 to 16 cm) between 2011 and 2016. For the LWR, standard length and total weight were used. The allometric coefficient b varied from 2.66 to 3.26. These results provide biological data for a region of extreme biogeographical importance that is suffering serious environmental disturbances.
       
  • Length‐weight relationship of two Ambassid fish species, Parambassis
           dayi (Bleeker, 1874) and Parambassis thomassi (Day, 1870) from River
           Pamba, Southern Western Ghats, India
    • Abstract: The present study provides the length‐weight relationships (LWRs) of two Ambassid fish species, Parambassis dayi (Bleeker, 1874) and Parambassis thomassi (Day, 1870) from River Pamba in Southern Western Ghats, India. Fishes were collected on a monthly basis between April 2014 to March 2015 using gill nets (1.0–3.0 cm), cast nets (1.0–2.0 cm) and seine nets (1.0 cm). The b values in the LWRs were estimated as 3.01 for P. dayi and 3.14 for P. thomassi. No previous information is available on LWRs for these two species in FishBase.
       
  • Relationships between total length and otolith measurements for 36 fish
           species from Gökçeada Island, Turkey
    • 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.
       
  • Length–weight relationships for four fish species from the Muling
           River, Heilongjiang, China
    • Abstract: In this study, fish samples were collected by electric fishing gear (2,000 W, 650 V) in May 2015. The length–weight relationships for four fish species from the Muling River in China belonging to two families and four genera were analyzed. A total of 115 specimens were used to estimate the relationship parameters.
       
  • Length–weight relationships of five mullet fish species from the
           Southern Taiwan coast
    • 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.
       
  • Length‐weight relationships of Badis dibruensis Geetakumari and
           Vishwanath, 2010 (Badidae) and Lepidocephalichthys arunachalensis (Datta
           and Barman, 1984) (Cobitidae) from Subansiri River (Brahmaputra basin),
           Northeast India
    • Abstract: Length–weight relationships (LWRs) for Badis dibruensis and Lepidocephalichthys arunachalensis, collected from the lower Subansiri River (Brahmaputra basin) in Assam, India from March 2016 to April 2017 using fishing gears namely cast nets (2.5 m, 1 m; 10–15 mm mesh size) and gillnets (30 × 0.9 m; 5–10 mm mesh size), are presented based on seasonal collections. The b values in the LWRs were determined as 2.56 for B. dibruensis and 3.28 for L. arunachalensis.
       
  • Length–weight relationships of three endangered tidal pool fish
           species on Jeju Island, Korea
    • Abstract: The length–weight relationships (LWRs) of three endangered tidal pool fishes, Spratelloides gracilis (Temminck & Schlegel, 1846), Atherion elymus Jordan & Starks, 1901, and Enneapterygius etheostomus (Jordan & Snyder, 1902), from Jeju Island, Korea, were analysed. A total of 280 specimens were sampled using hand nets (mesh size 1 mm) or by dredge (mesh size 5 mm) from July 2015 to July 2016. This study provides the first LWRs for two species, a new LWR for one species, and a new maximum length data for two species.
       
  • Length–weight and length–length relationships of two goby species,
           Neogobius caspius (Eichwald, 1831) and Proterorhinus nasalis (De Filippi,
           1863) from the southern Caspian Sea
    • Abstract: The present study provides the length–weight (LW) and length–length (LL) relationships for two goby species, Neogobius caspius and Proterorhinus nasalis, which were captured in the southern Caspian Sea. Total length (TL) and standard length (SL) were determined as well as weight. Specimens were collected monthly from September 2014 to August 2015 by beach seine (mesh size 10 mm). The LW parameter b for these species was 3.17 and 2.99, respectively, with a high coefficient of determination (r2 > .95). All LLRs were highly correlated (r2 > .97). Both species had no previous LWR and LLR estimates in FishBase.
       
  • Movement of small‐bodied fishes from Lake Michigan into Chicago Area
           Waterways: Insights from otolith chemistry
    • Abstract: The Chicago Area Waterways System (CAWS), an artificial connection between Lake Michigan (LMI) and the Illinois River watershed, has served as a conduit for invasive species and is a potential pathway for viral hemorrhagic septicemia (VHS) to spread from the Great Lakes into the Illinois River drainage. Although some fishes are known to have moved from LMI into the Illinois River via the CAWS, the rate of fish passage from the lake into the CAWS is unclear. Stable carbon isotopic signatures (δ13C) in otoliths differ between lake‐ and CAWS‐resident fish and were used as a natural tag to identify individuals that may have moved into the CAWS from LMI. The objectives of this study were to (i) estimate relative frequency of individuals with otolith δ13C indicative of prior residency in LMI among small‐bodied (
       
  • Length–weight relationships for seven fish species from the Nandujiang
           River in Hainan Island, China
    • Abstract: Length–weight relationships (LWRs) were determined for seven fish species collected during 2014 and 2015 between January and July each year from Nandujiang River. The study used drift gillnet with 4 cm mesh (100 m long × 1.2 m high) as well as electrofishing. The parameter “b” of the LWR equations varied between 2.963 to 3.171 for the species studied.
       
  • Length–weight relationships of Hara hara (Hamilton, 1822), Pangio pangia
           (Hamilton, 1822) and Setipinna brevifilis (Valenciennes, 1848) from the
           lower Brahmaputra River, Northeast India
    • Abstract: The present study describes the length–weight relationships (LWRs) for Hara hara, Pangio pangia and Setipinna brevifilis from the lower Brahmaputra River in Assam, Northeast India, collected from June 2016 to May 2017, using fishing gears namely cast nets (9′, 1 ⁄ 2″) and gillnets (30 × 0.9 m). No previous data have ever been recorded on LWR for these three species.
       
  • Length–weight relationships of five fish species associated with krill
           fishery in the Atlantic sector of the Southern Ocean
    • Abstract: Length–weight relationships (LWRs) of five fish species commonly associated with Antarctic krill fishery, were determined. Samples were collected with Chinese krill trawler (codend mesh size 2 cm) in the Atlantic sector of the Southern Ocean from January to August 2016. Data on LWRs and the relationships between weight and standard length as well as weight and total length of those species were updated for the database of FishBase. Those data on fish species derived from Antarctic krill fishery will be very helpful in understanding the interaction between krill fishery and the associated fish community.
       
  • Backpack electrofishing effort and imperfect detection: Influence on
           riverine fish inventories and monitoring
    • Abstract: An increased electrofishing sampling effort will increase detection probabilities of riverine fishes. In this study, a repeat‐sampling approach was used in small to medium‐sized Ontario (Canada) rivers to estimate: (i) species‐specific detection probabilities of freshwater fishes, (ii) the number of sampling events required to confidently detect species, and (iii) the power of timed‐search surveys to detect future distribution (or occupancy) declines. Wadeable habitats at 36 sites were sampled with a backpack electrofisher on four separate dates during the summer low‐flow period in 2013 and 2014. Forty‐two species were collected, including three species of conservation concern (American eel Anguilla rostrata Lacépède, 1802, channel darter Percina copelandi Jordan, 1877, northern sunfish Lepomis peltastes Cope, 1870), and two recreationally important species (largemouth bass Micropterus salmoides Lacépède, 1802 and smallmouth bass Micropterus dolomieu Lacépède, 1802). A hierarchical Bayesian modelling approach was used to estimate detection probabilities and site occupancy for 18 species at four levels of effort: 250, 500, 750 and 1,000 s. In all cases, species detection was imperfect. Search effort had a positive effect on estimates of detection probability and site occupancy and the power to detect declines in future distribution. Detection probabilities ranged from 0.11 to 0.66 with an effort of 250 s, and 0.27 to 0.92 with an effort of 1,000 s. For 13 species, detection and power to detect changes in distribution were significantly improved by increasing sampling effort from 250 to 750 s or 1,000 s. For the channel darter and northern sunfish, three replicate sampling visits (of 750 or 1,000 s duration) are recommended for confident detection.
       
  • Length–weight relationships of two schizothoracinae fish species from
           the Maquan River, the upper reaches of the Yarlung Zangbo River, Tibet,
           China
    • Abstract: Length‐weight relationships (LWRs) were determined for two endemic fish species from the Maquan River, the upper of the Yarlung Zangbo River: (Ptychobarbus dipogon Regan, 1905, Schizothorax waltoni Regan, 1905). All the specimens were collected between May and September of 2014. Length–weight relationships for these two fish species were determined for the first time, and new maximum body weights were recorded for these two species. These results will be useful for fishery research, management and conservation of the Yarlung Zangbo River.
       
  • First record of tub gurnard, Chelidonichthys lucerna (Linnaeus, 1758),
           from the south‐eastern Baltic Sea (Lithuania)
    •  
  • Length–weight relationships of 10 fish species from Shengsi Ma'an
           Archipelago Special Marine Protected Area, East China Sea
    • Abstract: The length–weight relationships (LWR) for 10 species belonging to seven families from the Shengsi Ma'an Archipelago Special Marine Protected Area (East China Sea) are presented. Four fishes had no previous LWR estimates in FishBase, and one new maximum fish length was recorded in the study.
       
  • Development and characterization of microsatellite loci in Amazonian dwarf
           cichlids Apistogramma spp. (Perciformes: Cichlidae): Uncovering geological
           influence on Amazonian fish population
    •  
  • Issue Information
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  • Identification of key nutrients for gonadal development by comparative
           analysis of proximate composition and fatty/amino acid profile in tissues
           and eggs of Chinese sturgeon (Acipenser sinensis Gray, 1835)
    • Abstract: The present study was conducted to characterize the proximate composition and fatty/amino acid profile in muscle, liver and gonads obtained from farmed male and female Chinese sturgeon (Acipenser sinensis) with gonad development at stage II, and to discern the key nutrients for gonads by comparing the nutrients between tissues and between fish at different gonad stages. Chinese sturgeon were reared in an outdoor circular cement pool at temperatures ranging from 8°C to 26°C, and fed with 70% artificial diets and 30% frozen forage fish at a feeding rate of 0.2%–1.5% body weight according to the water temperature. Three male and three female A. sinensis were sampled for analyses. Results showed that the lipid content in gonads was significantly higher than in other tissues in both males and females (p 
       
  • Design and test of a grid to reduce bycatch in the longfin inshore squid
           (Doryteuthis pealeii) trawl fishery
    • Abstract: A species separation grid was tested for a squid trawl to reduce finfish bycatch in the Nantucket Sound longfin inshore squid (Doryteuthis pealeii) fishery in southern New England, USA. The experimental trawl with a grid significantly reduces bycatch of summer flounder (Paralichthys dentatus) (76.4%, p 
       
  • Migration patterns and home range of pike‐perch (Sander lucioperca,
           Linnaeus, 1758) in Dutch river systems
    • Abstract: Pike‐perch (Sander lucioperca L. 1758) is one of the freshwater species caught by professional fishermen in the Netherlands. The species is also popular with sport fishermen. Little is known about its migration and rehabilitation in large river systems. The aim of the present study was to obtain data on the movements of pike‐perch in the Dutch large river systems and investigate when and how far individual fish swim up‐ or downstream. Seasonal migration was expected. The second objective was to gain information on how many fish pass the Haringvlietdam when migrating downstream during high discharge, and ending up in the North Sea. The third objective was to gain data on how many fish were caught by the fishermen. NEDAP TRAIL System® transponders were surgically implanted in 286 pike‐perch between June 2007 and October 2008. Marked fish could be detected via several detection stations in the river systems throughout the Netherlands and one in the River Rhine station in Germany. Sport fishermen were asked to inform the organization when a marked fish was caught. Data collected between June 2007 and April 2010 indicate a pike‐perch home range of 30–40 km, with some individuals migrating up to more than 200 km. A regional approach regarding fisheries management is necessary. No seasonal patterns were found. Swimming activity was highest during darkness. Results showed pike‐perch around the Haringvlietdam swimming in the saltwater area on the sea side of the dam, and returning to the freshwater Lake Haringvliet, indicating that the structure of the dam is used for feeding, but also that the fish will die if the dam is closed when fish are still outside.
       
  • Egg identification of three economical important fish species using DNA
           barcoding in comparison to a morphological determination
    • Abstract: Accurate identification of fish eggs to species level is a challenging task as many species have similar egg sizes and morphology. The results of egg determination of three economically important fish species are presented by using DNA barcoding in comparison to the classical morphological determination. About 500 fish eggs from the Celtic Sea were collected, morphologically identified and used for DNA analysis. In total, DNA barcodes were successfully obtained from 98% of the investigated eggs, including 167 DNA barcodes from 169 morphologically identified fish eggs of Merluccius merluccius (98.8%), 257 of 262 Scomber scombrus (98.1%), and 47 from 50 Trachurus trachurus (94%). Overall, species identification with DNA barcodes showed a congruence of 96.2% to identification by morphology, whereas 3.8% (n = 18) of the analyzed eggs were morphologically assigned to the wrong species. The highest number of incorrect identified eggs was for S. scombrus (n = 15). Our study highlights the usefulness of DNA barcoding for valid fish egg identification but also indicates the robustness of the classical morphology‐based approach.
       
  • Description of 21 microsatellites for the Chinese bitterling, Rhodeus
           sinensis Günther, 1868
    • Abstract: Chinese bitterling (Rhodeus sinensis) is a freshwater fish endemic to China. During the past several decades, natural populations of this species have become endangered due to habitat fragmentation and water pollution. To help conserve and restore R. sinensis, Illumina Miseq sequencing was used to identify 21 polymorphic microsatellites. The number of alleles varied from 3 to 13, and the observed heterozygosity and expected heterozygosity ranged from 0.3067 to 0.9145 and 0.3845 to 0.9521, respectively. The polymorphism information content ranged from 0.3173 to 0.9105. These novel microsatellites will be useful in both conservation and management of R. sinensis.
       
  • Seasonal profile of the diet of the dace Telestes karsticus Marčić &
           Mrakovčić, 2011 (Cyprinidae, Leuciscinae) endemic to Sušik Creek,
           Croatia
    • Abstract: The first data on the feeding ecology of the endemic Telestes karsticus are presented for specimens sampled monthly (July 2007–July 2008) from the Sušik Creek in the Lug Polje field, Croatia. Macrozoobenthos density was calculated and compared with the stomach contents of T. karsticus and the seasonal profile of the diet was examined. The ratio of gut length vs. standard length was 0.9 ± 0.12. Gut contents revealed that benthic invertebrates accounted for the majority of food consumed, although terrestrial arthropods, plant material, algae and fish were also found. Since this is the only fish species in the investigated creek, T. karsticus can be concluded to be cannibalistic. The proportion of empty guts found in all seasons was small, indicating year round feeding. The number and diversity of prey species was highest in spring and lowest in summer. Ivlev's electivity index was very high for Cladocera, Coleoptera, Trichoptera, Heteroptera and Hymenoptera in all seasons, suggesting positive selection for these prey groups, as opposed to Oligochaeta, Isopoda and Bivalva, which showed negative values in all seasons. For Actinopterygii, the Ivlev coefficient of selection was highly negative in spring, and highly positive in summer. Plant matter was detected in stomach contents in all seasons, with the highest share found in summer when other prey species were less available. The karstic dace is a generalised feeder, consuming the most available prey, and therefore can be classified as a euryphagous omnivore.
       
  • Geographic variations of the mottled skate, Beringraja pulchra (Liu, 1932)
           (Rajidae) in the Yellow and East seas based on molecular and morphometric
           data
    • Abstract: In order to prove the fisheries‐related hypothesis of the presence of two local populations of the mottled skate, Beringraja pulchra in the Yellow Sea (Sensu Jo et al., ), the geographic variations of 90 individuals (in molecule) and 129 individuals (in morphology) were investigated. The skates were collected from the middle Yellow Sea (Daechungdo), southern Yellow Sea (Heuksando), and the middle East Sea (Ulleungdo) using gill nets, bottom trawls and longlines. Comparing 471 base pairs of mitochondrial DNA cytochrome c oxidase subunit I (mtDNA COI) sequences, only three haplotypes (BR1–BR3) were found. The Daechungdo and Heuksando individuals displayed all three haplotypes, whereas the Ulleungdo individuals displayed a single haplotype (BR3). Pairwise fixation indices (FST) showed that the Daechungdo and Heuksando individuals were not genetically distinguishable (with a value of −0.0344), whereas the Ulleungdo individuals were clearly distinct from both the Daechungdo and Heuksando individuals (with values of 0.6875 and 0.6871, respectively). Similar to the molecular result, a canonical discriminant analysis based on seven morphometric characters showed that the Ulleungdo individuals had positive values on the first axis, whereas those from the other two locations had negative values, slightly differentiating the two populations (East Sea population vs Yellow Sea population). This study is the first to identify two populations of mottled skate in the northwest Pacific.
       
  • The effects of population density and lake characteristics on growth and
           size structure of brook trout Salvelinus fontinalis (Mitchill, 1815) in
           boreal forest lakes in Canada
    • Abstract: This paper examines the effect of lake characteristics on population density and how this variation affects growth, mortality and population size structure of brook trout, Salvelinus fontinalis. The study was conducted on 17 recreationally fished, reproductively isolated boreal forest lakes in Newfoundland, Canada from 1993 to 2000. A standardized sampling program, the Fyke Littoral Index Netting program (FLIN) was used to collected data that describes brook trout population parameters and life history attributes. Regression analyses showed significant relationships between fish density and biomass and characteristics of the lakes. Variation in fish density and biomass was explained by lake surface area and littoral habitat area. Significant relationships were found when growth, mortality and size structure were regressed against density. The proportional stock distribution and theoretical maximum size of brook trout were negatively related to density, and natural mortality was positively related to density. The largest maximum length and highest proportional stock densities occurred at brook trout densities of less than 30 fish/ha. In general, the higher the proportion of littoral habitat area the higher the densities of brook trout, which correspondingly had important effects on growth, natural mortality and size structure of the brook trout populations. This information is critical to the development of management strategies aimed at altering size distribution to produce specific fisheries management outcomes.
       
  • A study on age and growth characteristics of spiny gurnard (Lepidotrigla
           dieuzeidei Blanc & Hureau, 1973), northeastern Mediterranean Sea
    • Abstract: This study investigated the age and growth characteristics of spiny gurnard, Lepidotrigla dieuzeidei, from the northeastern Mediterranean. Samples were collected by commercial trawls during the 2012–2013 fishing seasons. A total 1,878 speciments ranged from 7.10 to 15.90 cm total length and 2.28–35.88 g in weight. Female/male ratio was 1.2/1. The total length–weight relationship was W = 0.002 TL3.579 (r² = .909) for sexes combined, W = 0.0021 TL3.551 (r² = .914) for males and W = 0.0019 TL3.602 (r² = .904) for females. Age determination was conducted using the sagittal otoliths. Ages of examined individulas ranged from 3 to 11 years. Total length‐at‐age data were fitted using the von Bertalanffy growth model. Estimated growth functions were TLt = 18.100 [1−e−0.14 (t + 0.63)] for sexes combined, TLt = 23.587 [1−e−0.08 (t + 1.56)] for males and TLt = 16.612 [1−e−0.19 (t + 0.15)] for females.
       
  • Dietary protein requirement of juvenile triangular bream Megalobrama
           terminalis (Richardson, 1846)
    • Abstract: A 10‐week feeding trial was conducted to determine the dietary protein requirement of juvenile triangular bream (Megalobrama terminalis). Five semi‐purified diets (white fishmeal as a protein source) were formulated with five crude protein (CP) levels (26.30%, 32.94%, 38.33%, 44.18% and 50.09%; diets P1–P5). Each diet was fed to triplicate groups (20 per fish replicate, initially weighing 1.30 ± 0.02 g). The following parameters were measured to evaluate the effects of different CP levels: weight gain (WG), specific growth rate (SGR), feed efficiency (FE), protein efficiency ratio (PER), daily feed intake (DFI), viscerosomatic index (VSI), hepatosomatic index (HSI), intraperitoneal fat ratio (IPF), lipid retention (LR), liver glycogen content and plasma triglyceride level. The results of the feeding trial showed that WG, SGR and FE were significantly enhanced by an increasing dietary protein level of up to 44.18%, but there were no significant differences in protein levels from 44.18% to 50.09%. The PER and DFI showed a decreasing trend with increasing dietary CP levels. The VSI and HSI were not significantly affected by the different treatments, whereas the IPF increased significantly with decreasing CP levels. The highest LR value, liver glycogen value and triglyceride level in plasma were observed in fish fed the lowest CP diet (P1). Based on the WG and FE, this study suggests an optimum dietary protein level for M. terminalis of 44.18%.
       
  • The relationship between otolith size and estimated age of tigertooth
           croaker (Otolithes ruber Bloch and Schneider, 1801) in Oman Sea, Iran
    • Abstract: The relationships between somatic growth and otolith dimensions, otolith size to estimated age and growth parameters of the tigertooth croaker (Otolithes ruber) were investigated in 100 specimens (size range: 19.1–52.0 cm, total length) from the Oman Sea area, September 2014. All 100 otoliths were sectioned and determined by age. The oldest specimen was a 4.5‐year‐old female with a total length of 40.6 cm; the youngest specimen was also a female estimated at 1 year of age with a total length of 19.1 cm. The von Bertalanffy growth equation was estimated as Lt = 54.70 (1 − exp (−0.37 (t + 0.21))). Concluded was that there is a significant relationship between body size, otolith dimensions and estimated age of Otolithes ruber.
       
  • Growth, body composition and digestive enzyme responses of Caspian Kutum,
           Rutilus frisii (Kamenskii, 1901), juveniles fed different levels of
           carbohydrates
    • Abstract: The study evaluated the effects of dietary carbohydrate levels on growth performance and digestive enzyme activities in juveniles Caspian Kutum, Rutilus frisii (Kamenskii, 1901). Fish with an initial average weight of 0.8 ± 0.2 g (means ± SD) were fed five isonitrogenous and isoenergic formulated diets with different carbohydrate levels of 15%, 20%, 25%, 30% and 35% in triplicate groups for 10 weeks (fifteen 45‐L aquaria with 30 fish per tank and water temperature of 21.5–23.5°C). Based on the results, growth performance of Caspian Kutum was significantly improved by increasing carbohydrate levels from 15% to 35% (p 
       
  • Population genetics of wild Siniperca knerii Garman, 1912 in China as
           evaluated by microsatellites
    • Abstract: The Chinese perch Siniperca knerii Garman, 1912 is an endemic perciform freshwater fish species mainly distributed in the Yangtze River and the Pearl River of China. To evaluate their genetic diversity in these rivers, microsatellite markers were used to assess the genetic structure and genetic variability among nine wild populations of S. knerii. In this study, the 12 loci used were polymorphic, with observed heterozygosity (Ho) ranging from 0.4079 to 0.8886 and polymorphism information content (PIC) ranging from 0.4511 to 0.7146. Results showed that six populations from the Yangtze River had a higher genetic diversity than those from the three Pearl River populations. The Bayesian STRUCTURE analysis recovered genetic clusters that matched localities perfectly or the kind of ecology environment with a significant Fst between them. The findings of this research should provide useful information for management and conservation of S. knerii stocks.
       
  • New records of Speleogobius trigloides Zander & Jelinek, 1976 and
           S. llorisi Kovačić, Ordines & Schliewen, 2016 (Osteichthyes: Gobiidae)
           in the Aegean Sea
    •  
  • Southwards range extension of the great seahorse (Hippocampus kelloggi
           Jordan & Snyder, 1901) in Australia
    •  
  • Effects of dietary amino acid l‐lysine on survival, growth and
           haemato‐biochemical parameters in Indian catfish, Heteropneustes
           fossilis (Bloch, 1974), fingerlings
    • Abstract: An 8‐week feeding experiment was conducted to estimate the dietary lysine requirement of fingerling Indian catfish, Heteropneustes fossilis (total length = 6.35 ± 1.10 cm; weight = 4.70 ± 0.65 g) by feeding six isonitrogenous (400 g/kg CP) and isocaloric diets (17.90 kJ/g) containing six supplemental lysine levels ranging from 11.0 to 23.5 g/kg (diets I to VI, in incremental steps of 2.5 g/kg). Triplicate groups with 20 fish each were stocked in 75‐L circular continuous flow‐through troughs and fed experimental diets at 4% BW/day twice daily (08:00 and 18:00 h). Maximum live weight gain (304%), best‐feed conversion ratio (FCR, 1.46) and protein efficiency ratio (PER, 1.71) were obtained at 18.5 g/kg dietary lysine, beyond which these values showed a slight declining tendency. Best values for somatic and hematological indices were also obtained at this level. Significantly (p 
       
  • Length–weight relationships of two Nemacheilid fish species [Schistura
           fasciata Lokeshwor and Vishwanath, 2011 and Schistura reticulofasciata
           (Singh and Bănărescu, 1982)] from Simsang River, Meghalaya, India
    • Abstract: Length–weight relationships (LWRs) are presented for two fish species: Schistura fasciata Lokeshwor and Vishwanath, 2011 and Schistura reticulofasciata (Singh and Bănărescu, 1982), sampled from the Simsang River in Meghalaya, India. Fishes were caught seasonally from January to December 2015, with cast nets (10–15 mm mesh size) and electrofishing devices. The b values in the LWRs were determined as 3.09 for S. fasciata and 3.318 for S. reticulofasciata.
       
  • Length–weight relationships of fish species from Lower Paranapanema
           River Basin, Upper Paraná River Basin, Brazil
    • Abstract: Length–weight relationships were estimated for six fish species occurring in direct tributaries of the Lower Paranapanema River Basin. Data is described for the first time for five species and new measurements are provided for one species in the FishBase database. Studies of fish diversity are critical for species management and conservation, especially in this basin, which has suffered from many anthropical impacts.
       
  • Length – length relationships of 16 Caribbean elasmobranchs
    • Abstract: Elasmobranchs are commonly landed without fins and heads; however, the knowledge of total length is necessary for fishery management. We provide useful equations to extrapolate partial from elasmobranch carcasses lengths, to total lengths. Length‐Length Relationships (LLR) are described for 16 commercial elasmobranch species all included in the IUCN Red List: Hexanchus nakamurai, Heptranchias perlo, Squalus cubensis, Squatina dumeril, Scyliorhinus boa, Mustelus minicanis, M. higmani, M. norrisi, Carcharhinus acronotus, C. falciformis, C. limbatus, Galeocerdo cuvier, Rhizoprionodon lalandii, R. porosus, Sphyrna lewini and Pseudobatos percellens. This study provide new LLR equations and rsepresent an improvement in the knowledge of these species.
       
  • Length–weight relationships of seven myctophid fishes (Myctophiformes:
           myctophidae) in the South China Sea
    • Abstract: The study included 546 specimens of seven myctophid fish species from the South China Sea (captured during June 2015 by bottom and mid‐water trawls). Length‐weight relationships (LWRs), W = aLb, were estimated using standard length. The species belong to four genera. The values for the parameter a ranged from 0.006 to 0.022, while the b values ranged from 2.710 to 3.476 (Range of r2 values: .938 to .971). According to FishBase, this study presents the first LWRs for these species, including two maximum standard lengths for Diaphus chrysorhynchus and Notoscopelus resplendens.
       
  • Length–weight relationship of 12 fish species from the Lhasa River and
           surrounding area in Tibet, China
    • Abstract: Presented are the relationship between standard length (SL) and weight (W) for 12 fish species in Tibet, China, representing three families and six genera from the Lhasa River. All fish samples were collected by either electro‐shocker (12 V, 200 Hz), fish cages (mouth opening: 40 × 40 cm2, 5 m), or drift gillnets (3 × 1.5 m; mesh‐size: 3 cm to 8 cm) from different areas in the Lhasa River Basin, August and September 2015. Parameter b ranged from 2.88 to 3.29, and all correlation coefficient (r2) values were higher than 0.95. Length–weight relationships (LWRs) for three of the species as well as one maximum length are first reports for FishBase.
       
  • Length–weight relationships of five fish species from Carangidae family
           in waters of the northern Persian Gulf, Iran
    • Abstract: This research describes and presents some biological aspects of five fish species from carangidae family including: Alepes djedaba, Ulua mentalis, Alectis indica, Carangoides coeruleopinnatus, and Carangoides bajad in the Iranian waters of the northern Persian Gulf (Hormozgan Province, Iran). Samples were collected from April to September 2016. The fishing gears were gill nets (80, 100, 120 and 145 mm stretched mesh size), bottom and midwater trawls (30, 40 and 75 mm stretched mesh size in cod‐end) of local and commercial fishery. The b values of length–weight relationships ranged from 2.512 (95% CL = 0.054) for U. mentalis to 2.953 (95% CL = 0.155) for C. coeruleopinnatus and the correlation coefficient values (r2) were high for all species.
       
  • Length–weight relationships for three freshwater fish species from the
           Pengxi River (a tributary of the Yangtze River, China)
    • Abstract: This study determined the length–weight relationships of three freshwater fish species [Culter oxycephaloides (Kreyenberg & Pappenheim, 1908), Squalidus argentatus (Sauvage & Dabry de Thiersant, 1874), Rhodeus sinensis (Günther, 1868)] from Pengxi River, a tributariy of Yangtze River of China. Fish were collected during 2016 using drift gill nets (mesh size 1, 2 and 3 cm) and cage net (0.5 cm mesh size). For Culter oxycephaloides had no previous length–weight estimates were reported in the science literature. For Squalidus argentatus the present estimate includes a new maximum total length while for Rhodeus sinensis our study confirms the only existing LWR estimate quite well.
       
  • Comparative diets and foraging strategies of subyearling Atlantic salmon,
           brown trout, and rainbow trout during winter
    • Abstract: Over-winter survival of salmonids in streams is thought to be an important population regulation mechanism. Yet because of the difficulty of conducting field studies due to adverse weather or ice conditions, compared to other seasons, salmonid ecology during winter is least understood. Consequently, we sought to examine interspecific feeding associations of an important salmonid stream assemblage in the Lake Ontario watershed during winter. The diets of Atlantic salmon (Salmo salar) parr, brown trout (S. trutta) parr, and rainbow trout (Oncorhynchus mykiss) parr were significantly different in February but not in March. Salmonid diets differed from the benthos and the drift during both months. Dipterans (chironomids, simuliids, and tipulids) and ephemerellids were the major prey taxa consumed. All three species fed more heavily on prey items from the benthos than from the drift. The diet of Atlantic salmon had the highest similarity to the benthos whereas the diet of brown trout had the lowest similarity to the drift. All three salmonid species generally selected ephemerellids, limnephilids, and chironomids and avoided elmids. These winter feeding observations are the first reported for this specific salmonid assemblage and will help managers better understand interspecific associations during this critical period.
       
  • Length-weight relationships for three zoarcoid fish species from the
           coastal waters of the northern Yellow Sea, China
    • Abstract: Length–weight relationships (LWRs) were determined for three zoarcoid fish species: Zoarces elongatus Kner, 1868, Pholis fangi (Wang & Wang, 1935) and Chirolophis japonicus Herzenstein, 1890. Samples were collected from the coastal waters of the northern Yellow Sea (near Dalian City) using bottom trawl nets (20 mm stretched mesh size in the cod-end) for Zoarces elongatus and Pholis fangi and set gill nets (mesh size 15.6 mm) for Chirolophis japonicus. Samples were taken from mid-March to early April 2017. Parameter b values in the fitted LWRs were 3.119, 3.440 and 3.423 for Z. elongatus, P. fangi and C. japonicus, respectively.
       
  • Length–weight relationships of four fish species from the Nujiang
           River, China
    • Abstract: Length–weight relationships (LWRs) were determined for four fish species (Akrokolioplax bicornis [Wu, 1977], Barbodes wynaadensis [Day, 1873], Glyptothorax cavia [Hamilton, 1822] and Placocheilus cryptonemus [Cui & Li, 1984]) from the Nujiang River, China. Samples were collected from March 2008 to August 2016 (frequency of sampling during the study period: once per year), using various fishing gears (set nets [mesh: 1.5 cm × 2.0 cm], fish cages [0.5 cm mesh], hook, drift gill nets [mesh: 1.0 cm × 2.0 cm × 3.0 cm] and electro fishing). Two new maximum SL were recorded for B. wynaadensis and P. cryptonemus.
       
  • Length–weight relationships of three fish species from Piediluco
           Lake, Italy
    • Abstract: Length–weight relationships for Leucos aula, Scardinius hesperidicus, and Squalius squalus from the Piediluco Lake were provided. Data were collected by means of electrofishing, gill-nets (mesh sizes varying from 5 to 55 mm) and fyke-nets (mesh size 16 mm, total length 8 m, mouth width 1.5 m). The monitoring campaigns were carried out seasonally in the years 2004 and 2011, and in autumn 2012. A total of 5,198 specimens were analyzed. For all the species the value of b ranged between 3.163 for Leucos aula and 3.297 for S. hesperidicus. For L. aula a new maximum total length was also reported.
       
  • Length–weight relationships of three fish species of coral reef fishes
           from the northeastern of the Persian Gulf
    • Abstract: The investigation presents length–weight relationships for three coral reef fish species: Cephalopholis formosa (Shaw, 1812); Chaetodon nigropunctatus Sauvage, 1880; and Pomacanthus maculosus (Forsskål, 1775). The specimens were captured between April to August 2015 by spear-gun and wire trap (mesh size: 35 mm) in coral reefs of the northeastern areas of the Persian Gulf.
       
  • Length–weight relationships of three fish species from Kerala waters,
           south-west coast of India
    • Abstract: Length–weight relationships (LWRs) of three fish species: Scomberomorus commerson, Alepes vari, and A. kleinii were estimated from Kerala waters, south-west coast of India. Fish were captured between June 2016 and June 2017 by various gears such as ring seine (8–26 mm mesh size), trawl (30–40 mm cod end mesh size), hook and line (hook number VI–XII), smaller mesh sized drift gill net (26–90 mm) and larger one (120–170 mm) for bigger size fishes. Fish were collected on weekly basis from Cochin Fisheries Harbour (Lat. 09°56′327″N, Long. 76°15′764″E), Munambam Fisheries Harbour (Lat. 10°10′965″N, Long. 76°10′258″E), Kalamukku (Lat. 09°59′924″N, Long. 76°14′564″E) and Chellanam (Lat. 09°47′950″N, Long. 76°16′551″E). All LWRs were significant with r2 values ranged from 0.944 to 0.996 and b values ranged from 2.722 to 3.021 (p 
       
  • Length–weight and length–length relationships of four fish species
           from the middle reaches of the Minjiang River, southwest China
    • Abstract: Length–weight (LWR) and length–length (LLR) relationships are reported for Glyptothorax fokiensis (Rendahl, 1925), Microphysogobio kachekensis (Oshima, 1926), Pseudobagrus brevicaudatus (Wu, 1930), and Sinibrama taeniatus (Nichols, 1941) from the middle reaches of the Minjiang River and its tributaries, Sichuan Province, in southwest China. A total of 675 specimens were obtained between 2013 and 2016 using various types of fishing gear and electroshock fishing techniques. Standard length and total length for each individual were measured by digital slide caliper and each body weight was taken by digital balance. The b-values for LWRs varied from 2.617 to 3.249 (r2 > .954), and the LLRs were highly correlated (r2 > .983; p 
       
  • Effect of conservation of fish in formalin and ethanol on length-weight
           relationships and condition factor in Tlaloc labialis (Günther, 1866)
    • Abstract: The effect of the preserver on the length-weight relationship and condition factor were estimated using 50 specimens of Tlaloc labialis; a small stream fish from the Grijalva River basin, México. They were measured at different stages of preservation: freshly collected, fixed in 10% formalin and preserved in 70% ethanol for over a 2 years period. All fish decreased in weight and condition factor, with very significant differences compared to the fresh material. The value of the coefficient (b) increased and stabilized from the second month of preservation in ethanol.
       
  • Morphological and morphometric changes of sagittae otoliths related to
           fish growth in three Mugilidae species
    • Abstract: The aim of this study was to analyze morphologic and morphometric changes of sagittae otoliths throughout the growth of three mullets: Mugil liza, Mugil cephalus and Liza ramada. Fish were collected seasonally between October 2011 and April 2014, and three methods were used: regression analysis of traditional biometric characters; morphological analysis for group identification; and morphometrical analysis of shape indices among groups (circularity, rectangularity, aspect ratio and percentage occupied by the sulcus). In all species, dependence of standard length on otolith length and height were best described as power functions. Two morphological groups were identified for M. liza and M. cephalus, while three for L. ramada. Morphological changes were supported by morphometry differences only for the first two species. Smaller size specimens of M. liza had more rectangular otoliths with more percentage covered by the sulcus while bigger fish tended to have a more circular shape. For M. cephalus smaller size fish had a more elliptical shape. The observed changes may be reflecting life history changes, related to habitat or dietary shifting.
       
  • Influence of cortisol along the pituitary-ovary axis in the cichlid fish
           Oreochromis mossambicus
    • Abstract: Cortisol is the principal glucocorticoid released due to various forms of environmental as well as aquacultural stressors in fish. The aim of the present investigation was to determine cortisol-induced alterations along the luteinizing hormone (LH)-secreting cells–ovary axis in the tilapia Oreochromis mossambicus. Administration of cortisol to stripped O. mossambicus for a period of 22 days during the ovarian cycle caused significantly higher number of follicles with chromatin nucleoli (stage I) compared to those of initial controls and controls. Whereas the number of follicles at perinucleolar (stage II) and vitellogenic (stage IV) stages did not differ significantly between controls and cortisol-treated fish, the number of follicles at cortical alveolar stage (stage III) was significantly lower in cortisol-treated fish than in controls. While the stage V follicles (maturation stage) were absent in initial controls, their presence in controls was concomitant with intensely labelled LH-secreting cells in the proximal pars distalis (PPD) region of the pituitary gland during prespawning phase. However, cortisol-treatment resulted in complete absence of stage V follicles associated with weakly immunoreactive LH-content in the PPD region of the pituitary gland during prespawning phase. These results suggest that chronic cortisol- treatment causes suppression of LH-secreting cells activity and blocks progression of vitellogenic follicular development process in O. mossambicus.
       
  • Length-weight and length-length relationships of Balitora brucei Gray,
           1830 and Psilorhynchus balitora (Hamilton, 1822) from the Ranganadi river
           of Assam, India
    • Abstract: The study describes length-weight relationships (LWRs) and length-length relationships (LLRs) for two species of fishes, namely Balitora brucei Gray, 1830 and Psilorhynchus balitora (Hamilton, 1822) collected from Ranganadi river in Lakhimpur district of Assam, India for which no LWRs and LLRs are available. While sampling monthly between April 2012 and July 2016, a total of 987 specimens were collected (B. brucei = 427, and P. balitora = 560). Cast nets were used (2 - 10 mm mesh sizes; 2–2.5 m length). The values of the parameter slope (b) in the LWR were determined as 3.194 (male = 3.047 and female = 3.224) for B. brucei and 3.490 (male = 3.480 and female = 3.502) for P. balitora. Present investigation reports new maximum total length for both the fishes.
       
  • Assessment of Epinephelus coioides (Hamilton, 1822) aquaculture systems in
           the Gulf of Tonkin, Vietnam, by using fish parasites
    • Abstract: The parasite fauna of Epinephelus coioides can be used as an indicator to assess different aquaculture systems. A total of 133 E. coioides were collected from fishermen (wild fish) and marine fish farms (net cages, pond farms) in the Gulf of Tonkin (Ha Long, Cat Ba and Nghia Hung), Vietnam in 2013 and 2014, and examined for the presence of protozoan and metazoan parasites. Different patterns of parasite infections were found. The monogenean Pseudorhabdosynochus spp. was predominant in the net cage system; and the protozoans Trichodina spp. and Cryptocaryon irritans were found exclusively in pond and net cage cultivation sites in Nghia Hung and Cat Ba. These three species were assessed in addition to seven further indicator species and two dominance indices, to visualize the potential of assessing different aquaculture systems in Vietnam. This suggests the use of former shrimp ponds for grouper cultivation, reducing the pressure to further extend net cage cultivation in already highly influenced mariculture regions in Vietnam.
       
  • Finfish species richness and structure in the tidal-associated lagoons of
           Badin, Sindh, Northern Arabian Sea
    •  
  • The Chinese sleeper (Perccottus glenii Dybowski, 1877) in Ukraine: New
           data on distribution
    • Abstract: The Chinese sleeper Perccottus glenii Dybowski, 1877 is one of the most successful alien species in Europe today. This article is a review of the current distribution of the species in Ukraine using published data, own field studies (2005–2016) and collections from museums and colleagues. The Chinese sleeper has been confirmed in the Vistula, Danube, Dniester, Southern Bug and Dnipro river basins, with earlier occurrence (1970s–90s) in the Vistula, Danube and Dniester river basins. As a result, the species is distributed more evenly in these river basins. The Chinese sleeper was first recorded in the Dnipro and Southern Bug river basins in the 21st century; hence, its occurrence is still irregular. Present data suggest that, in some regions, the species could inhabit not only floodplains and bays but also fluvial river sections.
       
  • Length–weight relationships of fishes from the estuary of the Macaé
           River, Southeastern Brazil
    • Abstract: The present study provides the length-weight relationship (LWR) for eight species from the estuarine stretch of the Macaé River, Rio de Janeiro State, Brazil. Data were obtained quarterly between June 2011 and March 2012. These LWRs are the first records for six species and present new maximum values of total length for three ones.
       
  • A new distribution of the buffon's river garfish, Zenarchopterus buffonis
           (Valenciennes, 1847) in the southern coastal rivers of Bangladesh
    •  
  • Length-weight relationships of three fish species collected by
           recreational fishing in the northern coast of Yucatan Peninsula, Mexico
    • Abstract: Length-weight relationship (LWR) was estimated for three fish species from the northern coast of Yucatan peninsula in the Gulf of Mexico. All specimens were monthly collected from September 2015 to October 2016 by recreational fishing (handlining). A total of 408 individuals (15 Calamus campechanus, 9 Opsanus beta and 384 Sphoeroides nephelus) were sampled and analyzed. Information regarding LWR data for one of these species were not yet available in FishBase database, two of them have limited data and a new record of maximum length is presented.
       
  • Diversity of parasites in Cichlasoma amazonarum Kullander, 1983 during
           rainy and dry seasons in eastern Amazon (Brazil)
    • Abstract: This study investigated the influence of the rainy and dry seasons on the parasite communities of Cichlasoma amazonarum (Kullander, 1983) in a tributary of the Amazon River system, northern Brazil. Of 112 fish examined, 95.5% were parasitized by Ichthyophthirius multifiliis, Piscinoodinium pillulare, Gussevia disparoides, Posthodiplostomum sp., Procamallanus (Spirocamallanus) inopinatus, and Echinorhynchus paranensis, as well as by the Glossiphoniidae leech. Ichthyophthirius multifiliis and P. pillulare were the dominant parasite species, with I. multifiliis the most prevalent and abundant; the leech (Glossiphoniidae) was the least prevalent and least abundant. Parasites presented an aggregate dispersion pattern and seasonal variations in infestation levels, influenced by the environmental conditions in the rainy season. Variation in the parasite dynamics created overall changes in the parasite communities, characterized by greater diversity, species richness and evenness during the rainy season. However, there was a high similarity (99.8%) in the parasite community structure between the rainy and dry seasons. During the dry season the hosts had predominantly 1–3 parasite species compared to 3–4 parasites in the rainy season. Some parasites in the eastern Amazon undergo population changes relating to seasonality. These results thus indicate the correct season to apply adequate prophylactic measures to reduce negative impacts of parasites in this wild ornamental fish when captured.
       
  • Morphometric relationships for some species of elasmobranch from tropical
           eastern Pacific
    • 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.
       
  • Length–weight relationships of 11 fish species from the Nuoshuihe
           Precious Water Animal National Nature Reserve, southwestern China
    • Abstract: Length–weight relationships (LWRs) are presented for 11 species [Acrossocheilus monticola (Günther, 1888), Squalidus wolterstorffi (Regan, 1908), Sinibrama taeniatus (Nichols, 1941), Gnathopogon herzensteini (Günther, 1896), Rhynchocypris oxycephalus (Sauvage & Dabry de Thiersant, 1874), Rhodeus lighti (Wu, 1931), Platysmacheilus nudiventris Luo, Le & Chen, 1977, Hemibagrus macropterus Bleeker, 1870, Glyptothorax fokiensis (Rendahl, 1925), Liobagrus marginatoides (Wu, 1930), Sinogastromyzon szechuanensis Fang, 1930] from the Nuoshuihe Precious Water Animal National Nature Reserve in southwestern China. Samples were collected bimonthly with trap-nets (mesh size: 5 × 5 mm; height 0.3 m; width 0.4 m; length 7 m) from 2015 to 2016.
       
  • Testing baits prepared from by-product of the shrimp and snow crab
           industry in the pot fishery for Gadus morhua (Linnaeus, 1758) and
           Pollachius virens (Linnaeus, 1758)
    • Abstract: In a study between October and November 2015 in northern Norway, bait prepared from the by-product of the shrimp and snow crab industry was employed in the pot fishery to capture cod and saithe. Frozen natural herring was used as control bait. Pots with the three bait types were placed 1,000 m apart in order to eliminate the risk of interaction between the different baits. In total 11 sampling periods were conducted. There were no significant differences in catch rates between the different baits tested on cod and saithe. The manufactured bait tested in this study showed a continuous release of odours over a 14-day period. Results show that the water content of the bait increases rapidly in the first phase of the immersion (until day 7), and the corresponding loss of bait mass (dry weight) suggest some physical disintegration (erosion) of the bait until the water content stabilizes. This study illustrates that it is possible to replace natural herring with hydrolysates from by-products from shrimp or snow crab industry in the Norwegian pot fishery of cod and saithe.
       
  • Length–weight and length–length relationships of 26 fish species from
           the Yiluo River, a tributary of the Yellow River, China
    • Abstract: From February to October 2016, a total of 9,754 fish specimens were collected from the Yiluo River, a tributary of the Yellow River, China's second longest river. Based on these samples, length–weight relationships (LWRs) and length–length relationships (LLRs) were estimated for 26 species. Among these data, LWRs for 1 species, LLRs for 11 species, and maximum total lengths for six species were not previously recorded in FishBase. The a values of the LWRs varied between 0.0019 and 0.0116, and b values from 2.805 to 3.883. All regressions for LWRs and LLRs were highly significant (p 
       
  • Age and growth of Triplophysa anterodorsalis Zhu & Cao, 1989 in the
           Heishui River, China
    •  
  • Length-weight relationship of two mudskippers (Gobiidae: Oxudercinae)
           Oxuderces dentatus (Eydoux & Souleyet, 1850) and Scartelaos histophorus
           (Valenciennes, 1837) from Dhamara estuary, Odhisa, India
    • Abstract: Oxuderces dentatus and Scartelaos histophorus species were collected seasonally from the Dhamara estuary (Odhisa, India) using scoop nets, cast nets as well as by hand for a period of 1 year (January 2015–December 2015). Length–weight relationships were estimated. Total lengths (TL) for O. dentatus ranged from 42 to 80 mm, and from 58 to 122 mm for S. histophorus. Similarly, total weights of O. dentatus and S. histophorus ranged from 2.5–10.7 g to 7.7–26.5 g, respectively. The ‘b’ values estimated for O. dentatus (2.718) and S. histophorus (2.689) were below 3. The condition factors of O. dentatus and S. histophorus were minimum in summer and maximum post-monsoon.
       
  • Length- and age-based demographics of exploited populations of stout
           whiting, Sillago robusta Stead, 1908
    • Abstract: This study assessed variability in the length and age compositions, longevity, length-at-age and rates of growth and mortality of the east Australian stout whiting Sillago robusta Stead, 1908 population harvested by demersal trawl fisheries. Sampling was done over 2 years and was spatially stratified across three depth strata between 11 and 90 m at two locations approximately 400 km apart. There were no consistent depth-related differences in length and age compositions, but the mean and median length and age of the population was greater at the lower latitude location. Age classes 2 and 3 years dominated samples in the north, and 1 and 2 years in the south. Observed longevity was 10 years in the north, and 6 years in the south. Mean length-at-age was not consistently different between sexes, years or locations, nor did the von Bertalanffy growth function differ significantly between sexes, even though females had a greater estimated L∞ (23.45 cm FL) compared to males (22.36 cm FL). Estimated natural mortality (M) ranged between 0.42 and 0.77, using age- and length-based methods. Age-based catch-curve analyses identified the instantaneous rate of total mortality (Z) to range between 1.48 and 2.70, with subsequent estimates of fishing mortality (F) ranging between 1.15 and 2.00, being greater than M. Exploitation rates (E) were greater than 0.7, indicating that S. robusta at the study locations was heavily fished. The data provided here can be used as a basis to evaluate future fishery- and climate-related changes in the population demographics of east Australian S. robusta.
       
  • Length–weight relationship of Rastrelliger brachysoma (Bleeker, 1851)
           and Rastrelliger faughni Matsui, 1967 from the Andaman Islands, India
    • Abstract: This study reports the length–weight relationships (LWRs) of Rastrelliger brachysoma (Bleeker, 1851) and Rastrelliger faughni Matsui, 1967 from Andaman Islands, India. Sample sizes for the two fish species were 78 for R. brachysoma and 57 for R. faughni. Fish collected monthly from Junglighat fish landing center. Fish were captured by commercial ring seine units (mesh size ranging from 2 to 4 cm) between February 2016 and March 2017. LWRs were established as TW = 0.0042TL3.332 (r2 = .989) for R. brachysoma and TW = 0.0096TL3.022 (r2 = .980) for R. faughni.
       
  • Weight-length relationships of 3 demersal fish species from Lebanese
           marine waters, eastern Mediterranean
    • Abstract: Weight-length relationships (WLRs) were estimated for 3 demersal species, from the Lebanese marine waters, eastern Mediterranean, namely Coelorinchus caelorhincus (Risso, 1810), Scorpaena elongata Cadenat, 1943 and Stephanolepsis diaspros Fraser-Brunner, 1940. The specimens were collected using trammel and gill nets from June 2012 to October 2014. The values of parameter b of the WLRs W = aLb ranged from 2.922 to 3.708. Pronounced sexual dimorphism in WLR was observed for S. diaspros and none showed a WLR-based geographical pattern of distribution. WLRs reported in this study should be applied only within the observed length ranges.
       
  • Length–weight relationships of six fish species from Tapajós River,
           Eastern Amazon, Brazil
    • Abstract: The present study reports the length–weight relationships of six fish species from the Tapajós River: Curimata inornata, Geophagus altifrons, G. neambi, Pachyurus junki, Pseudoloricaria laeviuscula and Pristobrycon striolatus. No previous LWR information was available for these species in the FishBase database. Coefficients for the parameter b varied from 2.83 to 3.56.
       
  • Comparative analyses of reproductive activity in Schizodon knerii
           (Steindachner, 1875) (Characiformes: Anostomidae) in three sections of the
           São Francisco River basin
    • Abstract: This paper aims to establish possible changes in the main reproductive parameters of the so-called piau-branco, Schizodon knerii, in three sections of the São Francisco River basin. Fish (n = 388) were captured quarterly between May 2012 and April 2013 from three sections of the São Francisco River (SFR): section 1 = Três Marias Reservoir (TMR), a lentic environment; section 2 = SFR, the first 34 km downstream of TMR, a lotic environment in which the temperature, oxygen levels, and flow are not suitable for reproduction; section 3 = SFR, 34–54 km downstream from TMR after the confluence with the Abaeté River, a lotic environment in which temperature, oxygen levels and flow are suitable for reproduction. In section 2, females and males showed lower values of total length and body weight in relation to fish from sections 1 and 3. The reproductive mode of S. knerii in sections 1 and 3 exhibited a prolonged reproductive period, parceled spawning, and a reproductive peak from January to March. In section 2, neither spawning females or spermiated males were captured, probably due to the fact that this section receives cold water with low oxygen levels from the hypolimium of the dam that presents thermal stratification in the summer. This study showed in section 2, immediately downstream of the Três Marias Reservoir, that S. knerii does not reproduce successfully.
       
  • Length-weight relationships for freshwater fish species from humid forest
           enclaves at the Brazilian semiarid
    • Abstract: We report the length-weight relationships (LWR) for 11 fish species inhabiting headwater streams in the Araripe and Ibiapaba plateaus, Brazilian semiarid. Values of r2, a and b ranged respectively from .953 to .998, 0.010 to 0.043 and 2.81 to 3.69. Our reports on LWR are pioneer in humid forest enclaves at the Caatinga biome. Such enclaves of forest can be a checkpoint to climate change, but are under strong human pressure and remain under low investigation.
       
  • Relationships between fish and otolith size of nine deep-sea fishes from
           the Andaman and Nicobar waters, North Indian Ocean
    • Abstract: The study presents for the first time the otolith morphology of nine deep-sea fishes (Polymixia fusca Kotthaus, 1970, Neoepinnula orientalis (Gilchrist & von Bonde 1924), Chlorophthalmus nigromarginatus (Kamohara, 1953), Cubiceps baxteri (McCulloch, 1923), Bembrops caudimacula (Steindachner, 1876), Neoscopelus microchir (Matsubara, 1943), Ostracoberyx dorygenis Fowler, 1934, Synagrops japonicus (Döderlein, 1883), and Bathyclupea hoskynii Alcock 1891). Numerical relationships derived from the relation between size of the otolith and the fish can be used as predictors to estimate the prey size and to understand the trophic relations and food web dynamics of these less studied deep-sea organisms. The study was based on sampling carried out onboard FORV Sagar Sampada (Cruise No 349) during March-April 2016, along the continental margin of the Andaman and Nicobar islands in the Bay of Bengal using high speed demersal trawl. Length–weight relationships (LWR) and the regression between otolith size (width, weight, area and perimeter) and fish length (TL) of nine deep-sea fishes were considered. LWR showed negative allometric otolith growth in five species; four species showed positive allometric growth. Otolith size to fish size (TL) relation is explained by a simple linear regression considering otolith width (OW), otolith weight (OWe), otolith area (OA) and otolith perimeter (OP). Stronger r2 values (>.76) indicate robustness, except for Cubiceps baxteri (r2 = .65), and give better estimates for the TL of the fish.
       
  • Effects of water temperature and initial weight on growth, digestion and
           energy budget of yellow catfish Pelteobagrus fulvidraco (Richardson, 1846)
           
    • Abstract: The effects of water temperature and body weight on feeding, growth, and energy budget were inevitable in the yellow catfish Pelteobagrus fulvidraco (Richardson, 1846), an important fish cultivated in China. This study explores the interaction of water temperature and body weight on both energy utilization strategy and energy conversion efficiency to promote further healthy culture of yellow catfish. Fish with body weights of 6 g (Group S), 16 g (Group M) and 35 g (Group B) were reared in 15 circular glass steel cylinders 80 cm in diameter × 70 cm in height (180 L) at water temperatures of 21, 24, 27, 30 and 33°C (3 replicates for each temperature) for 42 days to investigate effects of water temperature and body weight on the feeding, growth, digestion and energy budget in yellow catfish. Results showed that the levels of dry matter, protein and energy in the body were significantly affected by water temperature (p 
       
  • Length–weight relationships of Garra birostris Nebeshwar & Vishwanath,
           2013, Garra annandalei (Hora, 1921), Johnius coitor (Hamilton, 1822) and
           Raiamas bola (Hamilton, 1822) from the Brahmaputra River basin, Northeast
           India
    • Abstract: Length–weight relationships (LWRs) for one percoid (Johnius coitor) and three cyprinid (Garra birostris, Garra annandalei and Raiamas bola) fish species from the Brahmaputra River basin in Assam, Northeast India, was studied on a monthly basis from November 2015 to December 2016, using fishing gears namely, cast nets (9′, 1/2″) and gillnets (30 × 0.9 m). No previous record is available on LWR data for three of these species.
       
  • Cohort-specific estimates of first-year survival are positively associated
           with size at stocking for lake sturgeon Acipenser fulvescens (Rafinesque
           1817) stocked in Black Lake, Michigan, USA
    • Abstract: The authors conducted a gillnet survey in 2013 in Black Lake, Michigan, USA to evaluate the lake sturgeon (Acipenser fulvescens) stocking programme that began in 2001. Objectives were to (i) estimate year-class specific abundance of juvenile lake sturgeon in Black Lake; and (ii) determine year-class specific survival of stocked year classes and determine whether year-class-specific first-year survival was related to average size at the time of stocking. Deployed were 15 and 20 cm stretch mesh gillnets at 72 randomly selected sites in Black Lake over a 3-week survey using a Schnabel multiple-mark, multiple-recapture estimator to determine overall abundance of stocked fish. Ages for captured fish were determined from fin ray cross sections and the presence of coded wire tags, and apportioned the overall abundance estimate of juveniles to year class using an age-length key. Overall survival estimates were calculated by dividing the year-class specific abundance estimates by the number of fish stocked that year. Also evaluated was the relationship between first-year survival and average total length (TL) at time of stocking using logistic regression. Overall survival from stocking to 2013 ranged from 0.03 to 0.53. First-year survival was positively associated with average TL at stocking, and ranged from 0.05 for fish stocked at 9 cm TL to 0.84 for fish stocked at 22 cm TL. Estimation of future cohort-specific abundance based on size-based expected survival allows managers to establish annual stocking targets that should lead to the achievement of long-term population goals for adult abundance.
       
  • Length–weight relationships of three catfish species from a tributary of
           the Dhaleshwari River, Bangladesh
    • Abstract: The present ichthyological report describes the length-weight relationships (LWRs) of three catfish species (Eutropiichthys murius, Nangra nangra and Gagata viridescens) belonging to two families from the Kaliganga River, a tributary of the Dhaleshwari River, Bangladesh. The analyses included 306 specimens collected monthly from fishermen's catches during October 2015 to April 2016. Ranges of regression parameters a and b of the three species were within 0.0058–0.0099 and 2.900–3.142, respectively with highly correlated coefficients of determination (r2 > .995; p 
       
 
 
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