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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  [1616 journals]
  • Back-calculating growth at age from scale readings for Squalius microlepis
           Heckel, 1843 and Scardinius plotizza Heckel & Kner, 1858 in the Neretva
           River basin (Bosnia and Herzegovina)
    • Authors: P. Ivanković; T. Treer, T. Tomljanović, Z. Knezović, S. Salaj
      PubDate: 2017-03-15T07:15:49.016296-05:
      DOI: 10.1111/jai.13349
  • Length–weight relationships of six coral reef-fish species from Chuuk,
           Federated States of Micronesia
    • Authors: J. Cuetos-Bueno; D. Hernandez-Ortiz
      Abstract: Length–weight relationships (LWR) were estimated for six reef species in Chuuk lagoon (Federated States of Micronesia) captured by commercial fishers. Specimens were sampled opportunistically over a period of 2 months between July and September 2014. Relationships include those for four common species not currently reported in FishBase (Caesio teres, Myripristis adusta, Lethrinus erythracanthus, and Chlorurus frontalis), and for two species with relationships based on just one or two samples (Scarus oviceps, and Plectropomus oligacanthus). While estimates for some species are tentative given limited size-range sampling, they still present an improvement in the currently available LWRs.
      PubDate: 2017-03-15T07:15:46.322564-05:
      DOI: 10.1111/jai.13339
  • Length–weight and length–length relationships of three Clupeonella
           species (Clupeidae) from the Caspian Sea
    • Authors: M. S. Alavi-Yeganeh; A. Vahedian, B. Bakhshaei, G. Bahmani
      Abstract: This study investigated length–weight and length–length relationships of three Clupeonella species: C. caspia, C. engrauliformis and C. grimmi captured in the southern Caspian Sea, Iran. Using a lantern net, 206 specimens were collected from July to August 2016. Presented for two of the species are the length–weight and the length–length relationships as well as the first reference on length–weight and length–length relationships for C. caspia in its distribution range.
      PubDate: 2017-03-13T01:40:53.361318-05:
      DOI: 10.1111/jai.13344
  • Occurrence of Nemipterus randalli Russell, 1986 (Nemipteridae) off Izmir
           Bay, Turkey
    • Authors: İ. Aydın; O. Akyol
      PubDate: 2017-03-13T01:40:50.926004-05:
      DOI: 10.1111/jai.13331
  • Length–weight relationship of six indigenous fish species from Deepor
           beel, a Ramsar site in Assam, India
    • Authors: S. Borah; B. K. Bhattacharjya, B. J. Saud, A. K. Yadav, D. Debnath, S. Yengkokpam, P. Das, N. Sharma, N. S. Singh, K. K. Sarma
      Abstract: Length–weight relationships for six small indigenous fish species, namely: Trichogaster chuna (Hamilton, 1822), Trichogaster lalius (Hamilton, 1822), Trichogaster fasciata Bloch & Schneider, 1801, Chanda nama Hamilton, 1822, Parambassis lala (Hamilton, 1822), and Macrognathus aral (Bloch & Schneider, 1801) were studied for the first time from Deepor beel, a Ramsar site (589 ha water spread area) located in Assam, India. A total of 617 fish specimens were collected for the present study on a monthly basis from February to August in 2016 from landing centres adjoining the beel. In the present study, b value ranges from 2.778 to 3.215, which is within the normal range. The LWRs for these six fish species from Deepor beel had not yet been reported for FishBase.
      PubDate: 2017-03-13T01:40:49.938011-05:
      DOI: 10.1111/jai.13348
  • Sympatric and syntopic occurrence of cownose rays: Neonatal strategies for
    • Authors: B. Sousa Rangel; V. Paes da Cruz, A. Rodrigues, M. L. Góes de Araujo, C. Oliveira, F. Foresti, R. Guimarães Moreira
      PubDate: 2017-03-13T01:40:49.030979-05:
      DOI: 10.1111/jai.13343
  • The effects of dietary Betaplus® and TechnoMos® on growth performance,
           blood parameters, and intestinal microflora in juvenile kutum, Rutilus
           kutum (Kamensky, 1901)
    • Authors: A. K. Amirkolaie; S. Karimzadeh, S. P. Miandehy
      Abstract: The main goal of the current study was to assess the combined effects of a dietary probiotic Betaplus and prebiotic TechnoMos on growth performance, blood biochemical parameters, and intestinal microflora in juvenile Rutilus kutum. Four experimental diets were prepared with the addition of Betaplus and/or TechnoMos to a basal diet for R. kutum juveniles. The diets were randomly assigned to one of 12 tanks, with three replications per diet. The results showed that supplementation of both pro- and prebiotic, separately or in combination, improved fish growth parameters (p 
      PubDate: 2017-03-13T01:40:47.465503-05:
      DOI: 10.1111/jai.13322
  • Length–weight and length–length relationships of eight fish species
           from Bohai Bay, China
    • Authors: H.-L. Xu; D.-X. Gu, R. Wang, J.-H. Sun, D.-Q. Bai
      Abstract: Length–weight and length–length relationships (LWRs and LLRs) for eight fish species collected quarterly by trawl net in Bohai Bay, China, were estimated in a total of 1,395 specimens from 2012 to 2015. These were Pholis fangi, Setipinna taty, Engraulis japonicus, Larimichthys polyactis, Thryssa kammalensis, Scomberomorus niphonius, Johnius grypotus and Sardinella zunasi. The LWRs for the last two fish species are first reports for FishBase.
      PubDate: 2017-03-13T01:40:46.046266-05:
      DOI: 10.1111/jai.13337
  • Occurrence of rare deep-water fish Sudis hyalina Rafinesque, 1810
           (Paralepididae) in Gökova Bay, Aegean Sea of Turkey
    • Authors: D. Türker; A. Kara, H. Bal, Ö. K. Tünay
      PubDate: 2017-03-13T01:40:45.150664-05:
      DOI: 10.1111/jai.13332
  • Salinity-induced changes to the survival, growth and glycogen distribution
           in the early fry stages of silver barb, Barbodes gonionotus (Bleeker,
    • Authors: N. Romano; F. Syukri, A. Karami, N. Omar, N. Khalid
      Abstract: Five-week-old silver barb, Barbodes gonionotus, fry (initial length = 10 mm) were subjected to different salinities of 0, 3, 6 or 9 ppt for 17 days, to then assess their survival and growth. Whole body histological sections were stained with Periodic-acid Schiff (PAS). Groups of 15 fish were triplicated in each treatment with an ambient temperature (26–28°C). Results showed that growth and condition factor significantly decreased and increased (p  .05), between 0 and 6 ppt (at 98% and 87%, respectively), the decrease was significant at 9 ppt (22%). In addition, the fry at 9 ppt had fewer gill mucous cells as well as reduced PAS positive staining intensity within the liver and intestine. This suggests energy was becoming exhausted, leading to mortalities and lower growth. Silver barb early fry were relatively sensitive to elevated salinity, which was likely due to their young age, but short-term exposure to 3–6 ppt can be used to decrease potential freshwater diseases in the early nursery culture.
      PubDate: 2017-03-13T01:40:42.437748-05:
      DOI: 10.1111/jai.13338
  • Do young on-grown eels, Anguilla anguilla (Linnaeus, 1758), outperform
           glass eels after transition to a natural prey diet'
    • Authors: J. Dainys; H. Gorfine, E. Šidagytė, E. Jakubavičiūtė, M. Kirka, Ž. Pūtys, L. Ložys
      Abstract: Survival rates among European eels, Anguilla anguilla (Linnaeus, 1758), on-grown using a formulated diet in a commercial aquaculture facility, were compared with glass eels from the same cohort following their transition to a natural prey diet in the laboratory. Treatments included zero, 42-day, and 196-day periods of grow-out prior to 30-day experimental periods when eels were fed Chironomus spp. larvae (10 tanks, each containing 240-L water and 40 glass or 10 on-growing eels; 12:12 hr photoperiod; water temperature 18°C). All glass eels survived, compared to 87% (42-day) and 99% (196-day) for on-grown eels. Although the eels on-grown for 196 days had a high survival rate, they did lose weight. Farm-reared eels may have accumulated sufficient resources over the 196-days to survive the first 30 days after weaning from a formulated diet, but not for an additional 30 days (84% survival). Lack of superior survival rates among on-grown eels challenges the presumed benefits of releasing on-grown eels for population restoration.
      PubDate: 2017-03-13T01:40:33.824549-05:
      DOI: 10.1111/jai.13347
  • New maximum size records and length–weight relationships for two
           species, Corica soborna (Hamilton, 1822) and Mystus bleekeri (Day, 1877),
           from the Ganges River (NW Bangladesh)
    • Authors: M. Y. Hossain; M. A. Hossen, F. Nawer, D. Khatun, M. N. U. Pramanik, M. F. Parvin, K. Yahya
      Abstract: This study records new maximum lengths and provides length–weight relationships (LWRs) for two small indigenous fishes, Corica soborna (Hamilton, 1822) and Mystus bleekeri (Day, 1877), from the Ganges River in northwestern Bangladesh. Fishes were sampled sporadically using gill nets and cast nets from August 2015 to July 2016. New maximum recorded lengths weere 5.3 cm total length (TL) for C. soborna and 17.7 cm TL for M. bleekeri. The LWRs were highly significant (p .958. These findings will play a significant role in the fisheries resource management.
      PubDate: 2017-03-13T01:40:31.036829-05:
      DOI: 10.1111/jai.13342
  • Combination of dietary β-glucan and Bacillus subtilis as a potential
           synbiotic for pacu Piaractus mesopotamicus (Holmberg, 1887)
    • Authors: B. S. Cerozi; R. B. Zanon, T. S. C. Silva, J. E. P. Cyrino
      PubDate: 2017-03-13T01:40:29.064582-05:
      DOI: 10.1111/jai.13340
  • Length–weight and length–length relationships for six commercial
           fishes from southern Korean waters
    • Authors: S. H. Huh; J. M. Jeong, J. M. Park
      Abstract: Presented are the relationships between total length and weight, and between total length and standard length for six commercial fishes collected twice a month from local fish markets in southern Korea between 2005–2006 for Acanthopagrus schlegelii (Bleeker, 1854), Hexagrammos agrammus (Temminck & Schlegel, 1843) and Hexagrammos otakii (Jordan & Starks, 1895), and monthly in 2004 for Dentex tumifrons (Temminck & Schlegel, 1843), Doederleinia berycoides (Hilgendorf, 1879) and Scomberomorus niphonius (Cuvier, 1832). The LWR for D. tumifrons is estimated for the first time, and a new maximum length was recorded for S. niphonius. All total length and weight relationships were significant (all r2 > .953). The values of exponent b, estimated using simple linear least squares of log-transformed weight and length data, ranged from 2.945 to 3.317.
      PubDate: 2017-03-13T01:40:27.704507-05:
      DOI: 10.1111/jai.13345
  • Length–weight relationships of 18 fish species from Paraíba do Sul
           basin, Minas Gerais, Brazil
    • Authors: T. M. S. Freitas; G. M. Dutra, G. N. Salvador
      Abstract: The present study established the length–weight relationships (LWRs) for 18 species of freshwater fish from Paraíba do Sul River basin, southeastern Brazil. LWR parameters are estimated for the first time for seven of these species. The allometric coefficient b varied from 2.81 to 3.32. These data complement the effort to understand the biology of one of the most threatened Brazilian basins.
      PubDate: 2017-03-13T01:40:25.533054-05:
      DOI: 10.1111/jai.13346
  • Buccal swab: A tissue sampling method for refinement of experimental
           procedures involving rainbow trout
    • Authors: S. Colussi; V. Campia, M. Righetti, T. Scanzio, M. V. Riina, E. A. V. Burioli, C. Foglini, F. Ingravalle, M. Prearo, P. L. Acutis
      Abstract: Buccal swabbing is a minimally invasive method to obtain DNA and biological material from humans and animals, including fish. Reports on buccal swabbing in fish are few and only for a limited number of species. Rainbow trout (Oncorhynchus mykiss) is an important animal model and because the yield of DNA may vary among and within different species in individuals of different sizes, it was selected as useful to optimize the buccal DNA collection in this species. Different storage methods were evaluated, aimed at DNA preservation by limiting DNA degradation and bacterial growth, using commonly available and inexpensive reagents. DNA quality was also tested by amplification of a single-copy nuclear gene and a mitochondrial gene. The results suggest that ethanol is the best storage choice for buccal swab sampling in fish genetic studies, as well as suitable for small-bodied rainbow trout.
      PubDate: 2017-03-11T02:20:45.25244-05:0
      DOI: 10.1111/jai.13324
  • Diet, feeding patterns, and prey selection of subyearling Atlantic salmon
           (Salmo salar) and subyearling chinook salmon (Oncorhynchus tshawytscha) in
           a tributary of Lake Ontario
    • Authors: J. H. Johnson; K. J. Nash, R. A. Chiavelli, J. A. DiRado, G. E. Mackey, J. R. Knight, A. R. Diaz
      Abstract: Since juvenile Atlantic salmon (Salmo salar) and Chinook salmon (Oncorhynchus tshawytscha) occupy a similar habitat in Lake Ontario tributaries, we sought to determine the degree of diet similarity between these species in order to assess the potential for interspecific competition. Atlantic salmon, an historically important but currently extirpated component of the Lake Ontario fish community, are the focus of a bi-national restoration effort. Presently this effort includes the release of hatchery produced juvenile Atlantic salmon in Lake Ontario tributaries. These same tributaries support substantial numbers of naturally reproduced juvenile Pacific salmonids including Chinook salmon. Subyearling Atlantic salmon and subyearling Chinook salmon had significantly different diets during each of the three time periods examined. Atlantic salmon fed slightly more from the benthos than from the drift and consumed mainly chirononmids (47.0%) and ephemeropterans (21.1%). The diet of subyearling Chinook salmon was more closely associated with the drift and consisted mainly of chironomids (60.2%) and terrestrial invertebrates (16.0%). Low diet similarity between subyearling Atlantic salmon and subyearling Chinook salmon likely minimizes competitive interactions for food between these species in Lake Ontario tributaries. However, the availability of small prey such as chironomids which comprise over 50% of the diet of each species, soon after emergence, could constitute a short term resource limitation. To our knowledge this is the first study of interspecific diet associations between these two important salmonid species.
      PubDate: 2017-03-11T02:20:41.48794-05:0
      DOI: 10.1111/jai.13335
  • Diet of the blue shark Prionace glauca in the Ecuadorian Pacific Ocean
           during the years 2013 to 2015
    • Authors: P. Loor-Andrade; J. Pincay-Espinoza, R. Rosas-Luis
      PubDate: 2017-03-11T02:20:38.009375-05:
      DOI: 10.1111/jai.13329
  • A new record of Atlantic tripletail, Lobotes surinamensis (Bloch, 1790),
           in the Ligurian Sea (NW Mediterranean)
    • Authors: F. De Carlo; A. Massaro, C. Musumeci, I. Rossetti, P. Sartor, A. Ligas
      PubDate: 2017-03-11T02:20:30.677769-05:
      DOI: 10.1111/jai.13333
  • Immunolocalization of Na+/K+-ATPase, Na+/K+/2Cl− co-transporter (NKCC)
           and mRNA expression of Na+/K+-ATPase α-subunit during short-term salinity
           transfer in the gills of Persian sturgeon (Acipenser persicus, Borodin,
           1897) juveniles
    • Authors: S. A. Shirangi; M. R. Kalbassi, S. Khodabandeh, H. Jafarian, J.-H. Lignot
      Abstract: The study tests the physiological responses of Persian sturgeon, Acipenser persicus, during the abrupt release of juveniles from freshwater (FW) into brackish waters (BW = 11‰) of the Caspian Sea. Fish weight at release was 2-3 g (2.55 ± 0.41 g; 8.8 ± 0.58 cm TL). Totals of 160 individuals were randomly distributed into four fiber-glass aerated tanks (volume 60-L). Two tanks served as controls (FW groups), and two as exposure tanks for BW (Caspian Sea water = CSW). Fish were sampled at 0, 3, 6, 12, 24, 48 and 96 hr after abrupt transfer to CSW. Plasma osmolality, immunolocalization of Na+, K+ -ATPase (NKA) and Na+/K+/2Cl– (NKCC) Co-transporter, NKA activity and the NKA α-subunit mRNA expression were analyzed. Blood osmolality of fish transferred from FW to CSW increased significantly within hours post-transfer (p 
      PubDate: 2017-03-10T10:39:15.766216-05:
      DOI: 10.1111/jai.13260
  • Length–weight relationships for three small reef-fishes from the
           Argentine coast: Helcogrammoides cunninghami (Smitt, 1898), Ribeiroclinus
           eigenmanni (Jordan, 1888), and Hypleurochilus fissicornis (Quoy and
           Gaimard, 1824)
    • Authors: M. F. Ríos; A. J. Irigoyen, D. E. Galván, S. M. Delpiani
      Abstract: In this study the first length–weight relationships are provided for Helcogrammoides cunninghami and Ribeiroclinus eigenmanni inhabiting subtidal rocky areas in northern Patagonia, and for Hypleurochilus fissicornis inhabiting intertidal rocky areas in Buenos Aires Province. Specimens were collected between 2009 and 2016, from seven different locations in northern Patagonia and Buenos Aires Province (Southwest Atlantic Coast; 37°–42°S), using a trawling dredge or a small hand net. New maximum lengths were recorded for R. eigenmanni and H. fissicornis.
      PubDate: 2017-03-10T10:39:03.273174-05:
      DOI: 10.1111/jai.13327
  • Length–weight relationships of two mugilid species from tropical
           estuarine systems in Alagoas, northeastern coast of Brazil
    • Authors: V. E. L. Silva; E. C. Teixeira, V. S. Batista, N. N. Fabré
      Abstract: Length-weight relationships were estimated for two mugilid species from estuarine systems in Alagoas, northeastern Brazil. Fish were sampled monthly using nylon monofilament gillnets with different mesh sizes during two fishery surveys. The first LWR reference for Mugil curvidens and new maximum lengths for both M. rubioculus and M. curvidens are provided.
      PubDate: 2017-03-09T07:05:29.170198-05:
      DOI: 10.1111/jai.13325
  • Morphometric analysis of otoliths of juvenile crucifix sea catfish Sciades
           proops (Valenciennes, 1840)
    • Authors: K. M. F. Freire; C. S. Oliveira, L. C. Rosa
      Abstract: The objective of this study was to analyze the morphometry of otoliths for Sciades proops juveniles by testing the hypothesis of equality in morphometric relationships for the right and left otoliths, which could then be interchangeably used to estimate fish size or weight. Samples were obtained monthly directly from anglers after each event that took place off the state of Sergipe from March/2014 to April/2015. Anglers used rod and reel during these events, with no restriction on hook size or line thickness. Each fish specimen sampled had their total weight (W, g) and total length (TL, cm) measured and their lapillus otoliths removed and stored separately. Each otolith had its length (OL), width (OWi), and thickness (OT) measured (all in mm) under a stereomicroscope. Otoliths were weighed using a precision scale (OW, g). A total of 883 specimens were sampled: TL = 12.0–60.5 cm and W = 9.8–1880 g. The weight-length relationship for the juvenile fishes was W = 0.0052TL3.086 and for their otoliths was OW = 0.0002OL3.177. The weight-length and length-length relationships fitted for each otolith (right and left) were not statistically different and thus all relations were estimated for grouped otoliths. The length-length relationships for the otoliths were: OWi = 0.947OL−0.205 and OT = O.484OL−0.698. The relationship estimated for juvenile fish and otolith weight was Wj = 1076.1OW−9.120. For juvenile fish total length and otolith length, width and thickness, the following relationships were estimated: TLj = 4.028OL−3.199, TLj = 4.208OWi−2.091, and TLj = 7.824OT + 3.659, respectively. Relationships between fish and otolith size, and between fish and otolith weight indicated a change in slope close to Lm50, which should be better explored when more adult specimens are available.
      PubDate: 2017-03-08T04:40:34.29965-05:0
      DOI: 10.1111/jai.13321
  • Length weight relationships of two small indigenous cyprinid fishes,
           Osteobrama cotio (Hamilton, 1822) and Salmophasia phulo (Hamilton, 1822)
           from Panchet Reservoir, Damodar River (tributary of River Ganga), India
    • Authors: K. M. Sandhya; U. K. Sarkar, G. Karnatak, L. Lianthuamluaia, V. Kumar, S. Kumari, D. Panda, P. Mishal, Y. Ali
      Abstract: Length–weight relationships were determined for two small indigenous cyprinid fishes: Osteobrama cotio (Hamilton, 1822) and Salmophasia phulo (Hamilton, 1822) collected from Panchet reservoir, Damodar River, India. About 143 specimens of Osteobrama cotio (5.2–10.4 cm TL) and 113 specimens of Salmophasia phulo (2.9–8.2 cm TL) were collected from November 2014 to June 2016 using gillnets of mesh size ranging from 25 to 120 mm (STR) and dragnets of mesh size 10–20 mm (STR). No previous information on LWRs for these two species from an Indian reservoir was available in the literature.
      PubDate: 2017-03-08T04:40:28.232016-05:
      DOI: 10.1111/jai.13328
  • Length–weight and length–length relationship of Strongylura
           strongylura (van Hasselt, 1823) and Hyporhamphus limbatus (Valenciennes,
           1847) from Chilika Lake, India
    • Authors: S. K. Karna; M. Mukherjee, V. R. Suresh, R. K. Manna, H. M. Manas, R. K. Raman
      Abstract: Analyzed were the length–weight relationship (LWR) and length–length relationship (LLR) of two fish species, Strongylura strongylura (family Belonidae) and Hyporhamphus limbatus (family Hemiramphidae) from Chilika Lake, India. A total of 616 specimens were sampled bi-monthly from August 2014 to June 2016 using seine nets and screen barrier nets operated by local fishermen that were used for the present estimates.
      PubDate: 2017-03-08T04:40:26.292271-05:
      DOI: 10.1111/jai.13334
  • Partial replacement of fishmeal in diets for turbot (Scophthalmus maximus,
           Linnaeus, 1758) culture using blue mussel (Mytilus edulis, Linneus, 1758)
    • Authors: M. Weiß; B. H. Buck
      Abstract: The purpose of this study was to investigate whether meat from blue mussels (Mytilus edulis) harvested from offshore structures could be used as an alternative protein source in aquaculture fish feed for turbot (Scophthalmus maximus). Two feeding experiments with turbot were conducted in an initial experiment to test the applicability of mussel meal as a fishmeal replacement and/or supplement in turbot feed. In experiment A, the welfare, acceptance, and digestibility of feedstuff with 100%, 50% and 0% of mussel meal replacement for the fishmeal were tested for 8 weeks. In experiment B that followed, the convenience ratio of mussel meal protein in turbot feed for optimum growth was examined. Feedstuff with 25%, 10% and 0% of mussel meal were also fed for 8 (+6) weeks. Growth rates of fish were measured every 2 weeks and their health condition (liver somatic index) determined at the beginning and end of the experiments. Experiment A revealed that a replacement of fishmeal with either 100% or 50% mussel meal resulted in depressed growth (SGR: 1.31 ± 0.04 with 100% mussel meal; 1.54 ± 0.04 with 50% mussel meal; 1.71 ± 0.07 with 0% mussel meal). Experiment B revealed that a fishmeal replacement with 10% or 25% of mussel meal did not reduce growth nor did it have a negative effect on the health of the tested turbot. The study revealed that mussel meal has a high potential to serve as a supplement or as a fishmeal replacement in feed for turbot raised in aquaculture systems. Thus, its use in commercial aquaculture should be given future consideration.
      PubDate: 2017-03-08T04:40:24.988674-05:
      DOI: 10.1111/jai.13323
  • Predicting impacts of south-to-north water transfer project on fish
           assemblages in Hongze Lake, China
    • Authors: M.-L. Lin; S. Lek, P. Ren, S.-H. Li, W. Li, X. Du, C.-B. Guo, R. E. Gozlan, Z.-J. Li
      Abstract: The Chinese government implemented the ambitious south-north water transfer project (SNWTP), which aims to transport water from the Yangtze to the north of China where water shortages are severe. Although the ecological impacts of this project have been addressed publically, there remains a poor understanding of the effects of such large-scale water transfers on the populations of aquatic species. The potential ecological impacts of such water transfers on the Hongze Lake fish assemblages are assessed here using Self-Organizing Map (SOM) and Random Forest (RF) modeling. Using SOM, twenty-three fish species in 15 sampling sites were classified into two assemblages and four sub-assemblages corresponding to four distinct habitats (deep water macrophytes, deep water bare silt, shallow water bare silt, and shallow water macrophytes). The RF model further showed that water depth and transparency were the abiotic drivers underpinning fish assemblages in Hongze Lake. As the SNWTP is forecasted to modify the distribution of water depth and water clarity, major knock-on effects are expected on downstream lake fish assemblages.
      PubDate: 2017-03-04T01:51:27.750417-05:
      DOI: 10.1111/jai.13251
  • Comparison of body composition and sensory quality of wild and farmed
           whitefish (Coregonus macrophthalmus [Nüsslin, 1882])
    • Authors: S. E. Goebel; J. Gaye-Siessegger, J. Baer, J. Geist
      Abstract: This study compared the body composition (fillet yield, chemical composition and lipid quality of fillets) and sensory quality of captured wild (by gillnet in August 2011) with experimentally raised farmed (reared in concrete flow-through raceways, average water temperature 10 ± 3°C) whitefish, Coregonus macrophthalmus, from Lake Constance. The study was conducted in 2011 using 28 wild and 24 farmed market-sized fish of approximately equal total lengths (25.1 ± 1.21 and 25.6 ± 1.28 cm). Farmed female Coregonus macrophthalmus exhibited a 3.3% lower fillet yield resulting from larger gonads and a shallower body shape. The protein contents of farmed and wild fillets were equal (17.5% vs. 17.4%), but farmed fish fillets contained less moisture (76.1% vs.77.4%), less ash (1.2% vs. 1.6%), and more lipid (5.1% vs. 4.1%) than wild-caught specimens. Levels of monounsaturated fatty acids (MUFA) were higher in farmed fish (42.0 vs. 31.0 g/100 g lipid), as well as the levels of polyunsaturated fatty acids (PUFA; 26.0 vs. 19.7 g/100 g lipid), in particular 22:6n−3 (docosahexaenoic acid, DHA; 7.3 vs. 2.1 g/100 g lipid). Conversely, wild fish fillets contained significantly more 20:4n−6 (arachidonic acid, AA; 1.6 vs. 0.4 g/100 g lipid) and 20:5n−3 (eicosapentaenoic acid, EPA; 4.1 vs. 3.2 g/100 g lipid). Sensory evaluation of odour, colour, texture and flavour by an experienced six-person panel revealed a significant preference for the colour (79% vs. 21%) of farmed fish fillets. In conclusion, farmed whitefish can be strong competitors to wild whitefish in terms of product quality, with higher levels of healthy fatty acids and a more attractive fillet colour. Farmed Coregonus macrophthalmus thus represents a promising and pragmatic approach, compensating for the current capture decline in the whitefish fisheries of Lake Constance.
      PubDate: 2017-03-02T01:30:28.918408-05:
      DOI: 10.1111/jai.13318
  • Length–weight relationships for 19 headwater fish species from streams
           in the Sinos River basin, southern Brazil
    • Authors: C. Doebber; D. A. Antonetti, U. H. Schulz
      Abstract: This study reports the length–weight relationship estimates (LWRs) for 19 fish species inhabiting low order headwater streams in the Sinos River basin of southern Brazil. Between 2010 and 2014, 19 species at 47 sites were sampled in 10 sub-basins by electrofishing in winter and summer. For two species, Bryconamericus iheringii and Phalloceros caudimaculatus, the estimates in this study offer new maximum size ranges compared to previous studies.
      PubDate: 2017-02-28T01:15:57.012625-05:
      DOI: 10.1111/jai.13319
  • Japanese eel (Anguilla japonica Temminck & Schlegel, 1846) propagation
           using cryopreserved sperm samples
    • Authors: T. Müller; H. Matsubara, Y. Kubara, Á. Horváth, J. F. Asturiano, B. Urbányi
      Abstract: The aim of this study was to test the artificial seminal plasma (ASP) as the extender as well as methanol as the cryoprotectant for cryopreservation, and to collect information on the fertilizing capacity of cryopreserved sperm samples. Eggs from Japanese eel, Anguilla japonica, females were control-fertilized with native sperm diluted with ASP and cryopreserved sperm (ASP as extender [in 1:100 ratio] and 10% methanol in v/v final concentration). No statistical differences (p 
      PubDate: 2017-02-28T01:15:46.489591-05:
      DOI: 10.1111/jai.13316
  • Effects of feeding rate on the growth performance of gynogenetic albino
           sterlet, Acipenser ruthenus (Linnaeus, 1758) larvae
    • Authors: B. Laczynska; M. A. M. Siddique, T. Liszewski, M. Kucinski, D. Fopp-Bayat
      Abstract: The feeding rate effects were studied on the growth performance of gynogenetic diploid larvae of sterlet Acipenser ruthenus during the first 4 weeks of exogenous feeding. The experimental rearing was conducted from 7 to 38 days post-hatch (dph) in a circulation system. This was set up in four groups with three replicates (440 individuals/replicate), viz: AC-control larvae fed Artemia sp., CFC-control larvae fed compound feed, AG-gynogenetic larvae fed Artemia sp., and CFG-gynogenetic larvae fed compound feed. The larvae were reared in glass tanks (44 L volume, 10 individuals/L) with the temperature maintained at 18 ± 0.5°C, photoperiod of 12L:12D and water flow regime of 1-L/min and fed 50%, 25%, 25%, and 9% of their total biomass/day during feeding. Highest TL and WBW of gynogenetic diploid larvae (AG) were observed with 50.6 ± 1.2 mm and 607.3 ± 36.1 mg (n = 30) at 38 dph. Highest TL and WBW of control larvae (AC) were recorded with 49.5 ± 3.8 mm and 600.8 ± 88.0 mg (n = 30), respectively, with 73.1% ± 11.4% survival; the lowest survival rate was at 46.4% ± 7.1% (n = 30) for the CFG group. The results indicate that the gynogenetic and normal larvae of sterlet fed with live food (Artemia nauplii) from 7 dph can achieve higher growth and survivability compared to the larvae fed with formulated test feed. Results of this study suggest that the effective rearing of sterlet larvae from 7 to 38 dph strongly depends upon the types of feed rather than the genome manipulation performed.
      PubDate: 2017-02-28T01:15:36.635172-05:
      DOI: 10.1111/jai.13317
  • Length–weight relationships of three fish species from the Bay of
           Bengal, Bangladesh
    • Authors: M. R. Mondol; M. A. Hossen, D. A. Nahar
      Abstract: The present study describes the length–weight (LWR) of three fish species, Chela cachius (Hamilton, 1822), Coilia ramcarati (Hamilton, 1822) and Sardinella gibbosa (Bleeker, 1849) captured in the Bay of Bengal, Bangladesh, from December 2014 to November 2015. Fishes were captured with either gill nets (mesh size 2.0–5.0 cm) or set bag nets (mesh size 2.0–4.0 cm). The b values in the study varied from 2.88 (C. ramcarati) to 3.00 (S. gibbosa), with a mean a value of 2.94 at p 
      PubDate: 2017-02-23T23:40:24.219536-05:
      DOI: 10.1111/jai.13268
  • Morphometric relationships for four Scombridae fish species in Australian
    • Authors: S. P. Griffiths; G. C. Fry, F. J. Manson, R. D. Pillans
      Abstract: Morphometric relationships (length–weight and fork length–total length) were estimated for four scombrid species (Thunnus tonggol, Euthynnus affinis, Cybiosarda elegans, and Rastrelliger kanagurta) that are of growing importance to fisheries, but are also important predators representing different trophic levels in the neritic regime of Australian waters. The sample of 1,137 fish representing a broad size range for each species produced highly significant model fits (r2 > .95) that provide researchers with reliable information for future biological studies, stock assessment, and ecosystem models.
      PubDate: 2017-02-15T07:25:31.629337-05:
      DOI: 10.1111/jai.13136
  • Length–weight relationships, sex ratio and growth estimates for five
           sympatric sillaginids (Pisces) from the northern Arabian Sea coast
    • Authors: S. K. Panhwar; N. Qamar, M. Mairaj, W. Shaikh, N. Habib, N. Farooq, Z.-Q. Han, T.-X. Gao
      Abstract: Five species were collected (n = sample sizes in parentheses): Sillago arabica (8), S. attenuata (26), S. indica (971), S. sihama (77) and Sillaginopodys chondropus (18) from the northern Arabian Sea coast of Pakistan. Specimens were caught with gill nets (mesh size 2.5 cm knot-to-knot) by medium-sized commercial fishing vessels from September 2015 to April 2016. The parameter slope (b) in the length–weight relationships ranged from 2.44−3.21 for sexes grouped. Sex ratios were male-biased in all species and deviated from an ideal 1:1 sex ratio. Applying the von Bertalanffy function growth coefficient, reasonable growth (K = 0.890 year−1) was estimated for Sillago sihama, whereas this was slower in S. attenuata (0.24 year−1). Goodness of fit range was Rn = 0.32–1.0. This study provides a new reference for LWRs in three of the species (S. arabica, S. attenuata, and S. chondropus), with a new maximum total length for S. indica to add to FishBase. The data presented here on the five sillaginid species can be useful for local management and conservation of these species.
      PubDate: 2017-02-10T05:55:27.308703-05:
      DOI: 10.1111/jai.13287
  • Reproductive biology of the migratory freshwater fish Salminus
           brasiliensis (Cuvier, 1816) in the Cuiabá River basin, Brazil
    • Authors: E. Barzotto; L. Mateus
      Abstract: This study provides information on the reproductive biology of the dorado Salminus brasiliensis from the Cuiabá River basin, through determinating life history trajectories (length at first maturity, fecundity and spawning type) and the reproductive period, thus establishing the relationships between biotic factors and rainfall and river levels that might act as potential triggers for maturation and spawning. Salminus brasiliensis is a migratory species of great commercial and ecological importance. Individuals were collected monthly from August 2013 to July 2014 in the Cuiabá River. Analyses were performed based on biometric data and the gonads. Females attained greater lengths than males in the Cuiabá River basin, and with a significant difference in the sex ratio in favor of females. Peak reproductive activity occurred in November and December and was related to rainfall. Reproduction was seasonal, with spawning and reproductive potential correlating positively with the length and mass of the gonads of mature females. Average length at first maturity for females was estimated at 55 cm. A regular (annual) monitoring programme of essential biological variables to support a trend analysis over years (not just a snapshot study, as this one) is strongly recommended in order to give advice for the proper fishing policies in the region, as without regular basic data on the population dynamics, management is not possible.
      PubDate: 2017-02-08T07:31:12.949944-05:
      DOI: 10.1111/jai.13262
  • Length–weight relationships of 15 fish species from the Lower
           Uruguay freshwater ecoregion
    • Authors: G. Eguren; L. Carrasco-Letelier
      Abstract: This work is the first report on length–weight relationships for 15 fish species from the Lower Uruguay freshwater ecoregion. Fishes were collected between 2008 and 2010 in eight streams (Cañada del Sauce, San Luis, Don Esteban Chico and Grande, de la Palmita, Lencina, del Sauce and del Totoral), all tributaries to the Negro River (Uruguay). A standardized fishing effort (50 electric pulses along 100 m) with an electrofishing device (Type IG600T, Hans Grassl GmbH, Schönau am Königssee, Germany) was conducted in each wadeable stream reach. New maximal standard lengths and total weight are given for five and 13 fish species, respectively.
      PubDate: 2017-02-08T07:31:10.232636-05:
      DOI: 10.1111/jai.13263
  • Fatty acid profiles of the topmouth culter (Culter alburnus Basilewsky,
           1855) from five lakes located at different latitudes in China
    • Authors: H. R. Fan; E. García-Berthou, Z. J. Li, T. L. Zhang, S. W. Ye, J. S. Liu, S. S. De Silva
      Abstract: The topmouth culter (Culter alburnus Basilewsky, 1855) is a freshwater carnivorous fish of high nutritional value and widely distributed in lakes and reservoirs of China. In order to evaluate the fatty acid profiles in relation to habitat characteristics and to elucidate the main composition predictors, C. alburnus were collected from five lakes (Xingkai- LXk, Hongze- LHz, Kuilei- LKl, Chidong- LCd and Dongting- LDt) in China, ranging in latitudes from 28°30′ to 44°44′N and altitudes from 4 to 64 m. Ten fish from each lake ranging in total lengths from 414.2 to 423.9 mm were sampled between May to June in 2013 and 2014. A total of 23 fatty acids were identified using gas chromatography. Fatty acids that predominated in muscle samples of the fish were 16:0, 18:0, 16:1n−7, 18:1n−9, 20:5n−3, 22:6n−3 and 20:4n−6. Important differences in the fatty acid profiles of fish from high and low latitude lakes were discernible in that the two high latitudinal lakes (LXk and LHz) had significantly higher (p 
      PubDate: 2017-02-03T23:20:26.6602-05:00
      DOI: 10.1111/jai.13286
  • Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus
           Bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir,
           northeastern Brazil
    • Authors: N. H. C. Barros; A. A. Souza, E. B. Peebles, S. Chellappa
      Abstract: This study characterizes the dynamics of sex reversal in the marbled swamp eel, Synbranchus marmoratus (Osteichthyes: Synbranchidae), a diandric hermaphrodite, within the context of managing species with complex sex allocations. Monthly sampling in Marechal Dutra Reservoir, northeastern Brazil, was conducted using metal eel traps from July, 2013, to June, 2014, during which a total of 288 individuals were captured. Morphological and histological comparisons of gonads identified four sex types: primary males (n = 18), females (n = 197), transitional individuals (n = 30), and secondary males (n = 43). Primary males were smallest, ranging 18–32 cm total length. Females were numerically dominant throughout the 1-year sampling period, and ranged 20–60 cm. Transitional individuals ranged 32–60 cm, and secondary males ranged 46–74 cm. The otolith-based age of 52 specimens ranged 0.5 to 5+ year. Primary males were only observed at ages 0.5 and 1, and transitional individuals were only observed at ages 3 and 4 during the female-to-secondary-male transition, supporting the existence of two types of individuals: gonochoristic males and protogynous hermaphrodites. This observation was further supported by histological observations of deteriorating ovarian tissue in transitional individuals. Given the length of time required for individuals to attain secondary male status, this species appears to be particularly vulnerable to over-exploitation. Comparisons with results from other studies suggest sex allocations and adult size distributions vary substantially within this species’ range, adding complexity to management efforts.
      PubDate: 2017-02-02T23:59:36.255803-05:
      DOI: 10.1111/jai.13273
  • Exploring the molecular diversity of Eleotridae (Gobiiformes) using
           mitochondrial DNA
    • Authors: A. Guimarães-Costa; M. Vallinoto, T. Giarrizzo, A. Angulo, G. Ruiz-Campos, H. Schneider, I. Sampaio
      Abstract: Species with wide geographic distributions can consist of different lineages or even of different species. The present study evaluated the molecular diversity of the family Eleotridae by analyzing sequences of the COI gene from species collected in different locations in a Neotropical region as well as sequences from BOLD and GenBank. The analysis revealed the distinction and differentiation of a variety of species with high statistical support, including Gobiomorus dormitor (two lineages), Dormitator maculatus (three lineages) and Eleotris fusca (three lineages), and a number of different lineages of Microphilypnus. This indicates the existence of a number of unknown cryptic species that have not been reported previously, increasing the potential diversity of eleotrid species in the Neotropics.
      PubDate: 2017-01-30T02:17:02.881643-05:
      DOI: 10.1111/jai.13266
  • Length–weight relationships for seven fish species from Marajó Bay,
           Amazon estuary, northern Brazil
    • Authors: S. N. Loureiro; M. Mourão Júnior, T. Giarrizzo
      Abstract: Length–weight relationships (LWR) were estimated for seven fish species inhabiting the intertidal mudflats in the Marajó Bay, northern Brazil. A total of 514 specimens were collected quarterly between November 1994 and December 1995 using a beach seine (5 mm mesh size between opposite knots). Slope b of the LWR varied between 2.93 and 3.11, with a mean of 3.02. This study represents the first reference on LWRs for seven species and a new maximum length record for one of these species.
      PubDate: 2017-01-30T02:16:58.344321-05:
      DOI: 10.1111/jai.13281
  • An evaluation of elastomer and coded wire tag performance in juvenile
           Tibet fish Oxygymnocypris stewartii (Lloyd, 1908) under laboratory
    • Authors: T. B. Zhu; M. Y. Gan, X. G. Wang, L. Chen, Y. F. He, D. G. Yang
      Abstract: A 95-day experiment was conducted to evaluate the performance of a visible implant elastomer tag (VIE) versus a coded wire tag (CWT) implanted in juvenile Tibet fish Oxygymnocypris stewartii (Lloyd, 1908; total length 5~7 cm) under laboratory conditions. Mortality, tag retention and growth in three groups of juvenile O. stewartii (VIE-tagged, CWT-tagged and control) in duplicate were determined in six indoor tanks (300-L/tank volume, 100 fish/tank) at 15.6 ± 0.5°C water temperature. Results showed that neither tagging method had a significant difference on the mortality of the experimental fish, but that the growth rate in the VIE group was significantly lower than in the CWT and control groups. Mean tag retention in the VIE group was 95.2%, and 98.9% in the CWT group, with no significant differences in tag retention in the two methods. The study indicates that both VIE and CWT are suitable short-term tagging methods for hatchery O. stewartii juveniles.
      PubDate: 2017-01-30T02:16:48.684991-05:
      DOI: 10.1111/jai.13288
  • Length–weight and length–length relationships for nine species of the
           genus Paracobitis (Nemacheiliidae) in Iran
    • Authors: H. Mousavi-Sabet; A. Heidari, S. Vatandoust
      Abstract: Length–weight (LWR) and length–length (LLR) relationships were estimated for 330 specimens from nine Paracobitis species in 11 localities throughout Iran. All fish were collected upon occasion by electrofishing throughout Iran from July 2010 to October 2016. These represent the first reports of LWR data for eight species including: Paracobitis atrakensis, P. hircanica, P. longicauda, P. molavii, P. persa, P. rhadinaeus, P. smithi and P. vignai and first LLR data for all species. A new maximum length is reported for P. malapterura. Four of these species are endemic and five species are native to Iran. The length–weight parameter b ranged from a minimum of 2.74 for P. atrakensis to a maximum of 3.01 for P. longicauda, with regression coefficients (r2) ranging from 0.96 to 0.99. All LLRs were highly significant (r2 > .96).
      PubDate: 2017-01-30T02:16:42.825451-05:
      DOI: 10.1111/jai.13278
  • Difference in age, growth, and sexual demography of black-spot tuskfish,
           Choerodon schoenleinii (Valenciennes, 1839), in two adjacent populations,
           Ryukyu Archipelago, southern Japan
    • Authors: Y. Akita; A. Ebisawa, N. Hirai, K. Asami, I. Ohta, M. Uehara, K. Teruya, H. Yamada, M. Kobayashi, T. Sato, K. Okuzawa
      Abstract: To better understand the plasticity of life history traits in the blackspot tuskfish, Choerodon schoenleinii (Valenciennes, 1839), the characteristics of the population around the Yaeyama Islands (24°N, 124E) were examined and compared to those around Okinawajima Island (26°N, 128E) that had been investigated in a previous study. Age and growth of the Yaeyama population were examined based on 103 specimens collected at fish markets between 2006 and 2016. Specimens included 83 females (25.2–69.0 cm total length [TL]), and 20 males (43.1–71.8 cm TL). Ages determined from sectioned otoliths ranged from 1–9 for females, and 4–15 for males. Values for von Bertalanffy growth functions were Lt = 74.2 {1−exp[−0.23 (t + 0.38)]}, and the growth of the Yaeyama population was significantly faster than that of the previously studied population. Sexual demography of the two populations was compared using body length data on landings measured at the fish markets. In the Yaeyama population, females and males ranged from 24–65 cm TL and 39–75 cm TL, respectively; length at 50% individual sex change size was estimated at 54.7 ± 0.56 cm (±95% C.I.). In contrast, in the Okinawajima population, females and males ranged from 16–65 cm TL and 30–75 cm TL, respectively; meanwhile, 50% sex change size was estimated to be 50.0 ± 0.25 cm. There were thus significant differences in the size at sex change between the two populations. This difference may be related to the difference in population density between the sites.
      PubDate: 2017-01-30T02:16:38.367538-05:
      DOI: 10.1111/jai.13270
  • Length–weight and length–length relationships for 11 species of the
           genus Alburnoides Jeitteles, 1861 (Cyprinidae) from Iran
    • Authors: H. Mousavi-Sabet; A. Heidari, S. Vatandoust
      Abstract: Length–weight (LWR) and length–length (LLR) relationships were estimated for 11 Alburnoides species from 15 localities throughout Iran. These represent the first reports of LWR and LLRs data for 10 species, including: Alburnoides coadi (40 specimens), A. damghani (30), A. eichwaldii (110), A. holciki (30), A. idigensis (113), A. namaki (30), A. nicolausi (30), A. parhami (30), A. qanati (30) and A. tabarestanensis (30) and first LLR data for A. samiii. Nine of these species are endemic and two are native to Iran. The length–weight parameter b for these species ranged from a minimum of 2.94 for Alburnoides nicolausi to a maximum of 3.37 for Alburnoides parhami, with regression coefficients (r2) ranging from 0.91 to 0.99. All LLRs were highly significant (r2 > 0.96).
      PubDate: 2017-01-30T02:15:44.136462-05:
      DOI: 10.1111/jai.13271
  • Length–weight relationships of four fish species from the Niulan
           River, China
    • Authors: D. F. Zhang; W. Wang, Q. F. Liu
      Abstract: This study provides the length–weight relationships (LWRs) for four fish species [Leptobotia rubrilabris (Dabry de Thiersant, 1872); Opsariichthys bidens Günther, 1873; Xenocypris yunnanensis Nichols, 1925; and Sinogastromyzon sichangensis Chang, 1944] collected from the Niulan River, China. Samples were obtained between April 2008 and June 2011 using various types of fishing gear [drift gill nets (mesh: 5 × 5 cm), hook and electro fishing]. A total of 136 specimens belonging to four fish species were analyzed. For each species the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Prior to this study, the LWRs for S. sichangensis and X. yunnanensis were unknown. New maximum sizes for S. sichangensis and X. yunnanensis are also provided.
      PubDate: 2017-01-24T00:56:28.89702-05:0
      DOI: 10.1111/jai.13254
  • Length–weight relationships for four stingray species from the
           tropical Atlantic Ocean
    • Authors: E. C. Teixeira; V. E. L. Silva, N. N. Fabré, V. S. Batista
      Abstract: This study provides separate length–weight relationships (LWRs) for males, females and pooled individuals for four stingray species (Dasyatis guttata, Dasyatis marianae, Gymnura micrura, and Rhinoptera bonasus) found in the tropical Atlantic. The specimens were sampled monthly between April 2009 and February 2011 along the coast of Alagoas, northeastern Brazil, using different fishing gear. For three species, the LWR parameters are reported for the first time, including D. marianae, an endemic species.
      PubDate: 2017-01-24T00:56:27.842924-05:
      DOI: 10.1111/jai.13255
  • Estimates on age, growth and mortality of the French angelfish Pomacanthus
           paru (Bloch, 1787) (Teleostei: Pomacanthidae) in the southwestern Atlantic
    • Authors: C. V. Feitosa; M. E. Araújo, B. P. Ferreira
      Abstract: The aim of the present study was to determine age, growth and mortality of the French angelfish Pomacanthus paru. Age was solely determined by sectioned otoliths. All tetracycline-treated otoliths were 1 year of age and revealed a clear fluorescent mark when observed under UV light. Otolith weight increased exponentially with standard length, and linearly with age, indicating that otolith growth continues with age and is independent of size. Age of fish in the sample ranged from 1 to 27 years. The von Bertalanffy growth equation was TLt = 36.33 (1 − e−0.12 (t + 0)). Total rate mortality (Z) was estimated to be 0.10. Attaining maximal size slowly, P. paru has a long life expectancy. Most linear growth is achieved within approximately 74% of the lifetime of the fish. Besides being an important ornamental species, P. paru has been commonly captured for decades as bycatch in trap fisheries. These growth parameters should be used with the purpose of managing fisheries targeting this species before more meaningful limits can be imposed. In the aquarium trade management, it is suggested that conservationist issues should be based on capture-per-area and the establishment of protected areas.
      PubDate: 2017-01-24T00:56:25.650977-05:
      DOI: 10.1111/jai.13246
  • Does a diet including pellets from salmon cage farms affect the taste of
           wild saithe (Pollachius virens Linnaeus, 1758)'
    • Authors: I. Uglem; E. M. Ulvan, K. Toledo-Guedes, E. Hegstad, S. Blakstad, B. Buserud, B.-S. Sæther
      PubDate: 2017-01-24T00:56:18.398202-05:
      DOI: 10.1111/jai.13261
  • Length–weight relationships of 19 freshwater fishes from the Upo
           Wetland in South Korea
    • Authors: D.-K. Kim; H. Jo, J.-D. Yoon, J.-H. Kim, M.-H. Jang, G.-J. Joo, J.-S. Gim
      Abstract: The length–weight relationships (LWRs) for 19 freshwater fish species in Upo Wetland, South Korea, were analyzed. Fish samples were collected quarterly using scoop-nets (5 mm mesh), casting nets (7 mm mesh) and a fixed shore net (15 mm mesh) from 2007 to 2014. LWRs data for three species have not yet been listed in FishBase.
      PubDate: 2017-01-24T00:56:17.391249-05:
      DOI: 10.1111/jai.13253
  • Combined gut-content and stable isotope trophic analysis of the pelagic
           stingray Pteroplaytrygon violacea (Bonaparte, 1832) diet from the western
           North Atlantic Ocean
    • Authors: T. A. Weidner; A. C. Hirons, A. Leavitt, D. W. Kerstetter
      Abstract: The understanding of trophic relationships is vital for correctly modeling ecosystems and ecosystem effects of fisheries removals. The pelagic stingray is found in epipelagic sub-tropical and tropical waters worldwide and is a common bycatch in pelagic longline fisheries. Between August 2008 and November 2011, 156 specimens (81 males; 75 females) were collected during pelagic longline fishing operations in the US South Atlantic Bight and Gulf of Mexico. Stomach content analyses found that the major prey items were cephalopod molluscs (59.18%), followed by actinopterygiian fishes (37.75%), and decapod crustaceans (35.71%). These concentrations of prey items found in the stomachs coincide with previous studies done in the Pacific Ocean. In contrast to previous studies that found high percentages of empty stomachs (63%), the current percentage of empty stomachs was much lower (25.6%), likely due to shorter times between collection and inspection. Stable isotope analysis (δ13C and δ15N) was performed on white muscle in order to correlate the trophic position with gut-content analysis. The δ13C values ranged from -18.81‰ to -16.70‰, while the δ15N ranged from 6.11‰ to 11.88‰. Modeling of stable isotope data suggest that while squid are occasionally an important part of the pelagic stingray diet, prey usually consist of shrimp and other pelagic crustaceans. Pelagic stingrays fed within two trophic levels, but their prey appeared to feed on different carbon sources than those found in other pelagic elasmobranchs. A deeper understanding of the pelagic stingray diet sources can help fisheries management as it begins to transition into ecosystem-based management.
      PubDate: 2017-01-24T00:56:13.847926-05:
      DOI: 10.1111/jai.13259
  • Effects of chitosan-oligosaccharides on growth performance, digestive
           enzyme and intestinal bacterial flora of tiger puffer (Takifugu rubripes
           Temminck et Schlegel, 1850)
    • Authors: P. Su; Y. Han, C. Jiang, Y. Ma, J. Pan, S. Liu, T. Zhang
      Abstract: The present study was conducted to evaluate the effects of different dietary chitosan oligosaccharide (COS) levels on digestive enzyme activity, intestinal bacteria flora, and growth performance of the tiger puffer (Takifugu rubripes). Some 600 fish (initial body weight 129.2 ± 3.1 g) were randomly allocated into twelve 2,000-L blue cylinder aquaria with 1,500-L of sea water and divided into four groups (n = 3 aquaria/diet). The fish were fed experimental diets supplemented with different levels of COS (0% [control, L1], 0.05% [LC1], 0.1% [LC2], and 0.2% [LC3]) for 8 weeks. During the experiment, the water temperature was 18 ± 1°C, salinity 28 ± 0.1, pH 8.0 ± 0.1 (mean ± SD, n = 672); airstones were positioned at the bottom of the tank, dissolved oxygen content was above 7.0 mg/L, with a photoperiod of 12 hr light: 12 hr dark. The results showed that dietary COS significantly increased growth performance, intestinal-somatic index (ISI), and intestinal protease as well as lipase activity (p  .05). High-throughput sequencing analysis showed that COS affected the richness and diversity of intestinal microbial species. The Shannon index of intestinal bacterial flora was significantly higher in the control group than in other groups (p 
      PubDate: 2017-01-17T04:45:39.601343-05:
      DOI: 10.1111/jai.13282
  • Ovarian development and changes in the expression of pituitary
           gonadotropin subunits during the reproductive cycle of female Malaysian
           river catfish, Hemibagrus nemurus (Valenciennes, 1840), in captivity
    • Authors: Z. Zulperi; A. Christianus, F. M. Yusoff, S. A. Harmin, M. Y. Ina-Salwany
      Abstract: Determining the expression level of genes encoding the subunit gonadotropic hormones is critical in understanding the reproductive cycle and gonadal development in fish species. The objectives of this study were to monitor changes in the mRNA expression of three gonadotropin (GtH) subunits (α, FSHβ, and LHβ) during gonadal development of the female Malaysian river catfish, Hemibagrus nemurus, in captivity. In the study a quantitative real-time PCR approach was developed to assess these three mRNA transcript GtH subunit profiles and compare them with ovarian development. The number of transcript encoding GtH hormone, α, FSHβ, and LHβ subunits in pituitary glands of female H. nemurus was measured throughout the reproductive cycle from August 2013 to October 2015, with fish aged 1–27 months. The mRNA expression of GtH subunits increased with ovarian development throughout the reproductive cycle. The FSHβ mRNA level increased during ovarian development, reached its peak in mid-vitellogenesis, and was reduced during ovulation and spawning, whereas the LHβ mRNA level significantly increased in late vitellogenesis and reached its peak during the ovulation and spawning season (April–May). In α subunit, the mRNA level corresponded to FSHβ and LHβ, with a peak expression during ovulation. The findings suggest that FSH was strongly activated during vitellogenesis, whereas LH was involved at the end of gonadal development process, during ovulation, and in the final oocyte maturation.
      PubDate: 2017-01-16T01:25:28.078541-05:
      DOI: 10.1111/jai.13267
  • Length–weight relationships of three small indigenous fish species from
           the Lower Brahmaputra, India
    • Authors: S. Basumatary; H. Choudhury, B. Talukdar, H. K. Kalita, D. Sarma
      Abstract: Length–weight relationships (LWRs) for three small indigenous fish species from the lower Brahmaputra in Assam, India: Glyptothorax telchitta, Nangra assamensis, and Gudusia chapra were studied on a monthly basis from February 2015 to January 2016. Various fishing gear types were employed: cast nets (9′ ½”), gillnets (30 × 0.9 m, 0.5″; 60 × 3 m, 1.5″) and mosquito nets (20 × 6 m, 0.04″). No previous reference is available on LWR data for two of these species.
      PubDate: 2017-01-11T06:25:24.201817-05:
      DOI: 10.1111/jai.13274
  • Citric acid as a feed additive in pacu Piaractus mesopotamicus (Holmberg,
           1887) diets
    • Authors: H. Hisano; M. S. S. Sanchez, M. S. Nascimento
      Abstract: The objective of this study was to evaluate citric acid (0.0, 1.0, 2.0 and 3.0%) in isonitrogenous (23% of digestible protein) and isoenergetic (13.38 MJ of digestible energy/kg) pacu Piaractus mesopotamicus (Holmberg, 1887) diets. A 90-day feeding trial was conducted to evaluate the growth performance, haematological parameters and pH of the diets, stomach and gut, somatic indices, nitrogen retention and body composition of pacu juveniles. Fish (n = 160, 12.53 ± 0.17g) were distributed in 16 aquaria (300-L) with a recirculating water system (4 L/min) and controlled temperature (25.26 ± 0.47°C) in an experimental design completely randomized with four treatments and four replicates. Posteriorly, apparent digestibility coefficients (ADC) were assessed with pacu (n = 96, 80.35 ± 5.12 g) fed experimental diets including 0.1% chromium oxide III. Diet pH decreased (p 
      PubDate: 2017-01-11T06:25:21.537308-05:
      DOI: 10.1111/jai.13289
  • Seasonal niche segregation of two sympatric xenocyprinid fishes
    • Authors: M. H. Hu; Q. G. Liu, J. D. Zhang, R. Xiao, Y. J. Wang
      Abstract: Xenocypris microlepis (Bleeker, 1871) and Xenocypris davidi (Bleeker, 1871) are two closely related xenocyprinid species potentially subject to exploitative competition. They often coexist in many freshwater ecosystems, which offers an opportunity to analyze their relationships. The present study describes the seasonal feeding habits of age-3 X. microlepis and X. davidi in Xin'anjiang Reservoir, located in Zhejiang, China, as determined by stable isotope analysis. Particulate organic matter (POM; 50%) and periphyton (50%) were the major items observed in the X. microlepis diet, whereas periphyton (>60%) was prevalent in the X. davidi diet. Seasonal variations were observed in the diet compositions of both xenocyprinid species. Whereas X. microlepis tended to ingest more sediment organic matter (SOM) in autumn than in spring and summer, SOM was the secondary food item for X. davidi over the three seasons. The seasonal diet shift observed in this work indicates niche segregation of the sympatric pair. The results of this study contribute to the current knowledge of seasonal trophic interactions in predator–prey systems where sympatric xenocyprinids are present.
      PubDate: 2017-01-10T07:35:41.504728-05:
      DOI: 10.1111/jai.13264
  • First record of the honeycomb stingray Himantura leoparda
           (Manjaji-Matsumoto & Last, 2008) (Myliobatoidei: Dasyatidae) in the
           Mediterranean Sea, confirmed by DNA barcoding
    • Authors: N. Yucel; A. Sakalli, A. Karahan
      PubDate: 2017-01-10T07:35:39.190098-05:
      DOI: 10.1111/jai.13283
  • Length–weight and length–length relationships for seven fish species
           from the Zohreh River, Iran
    • Authors: Y. Keivany; M. Zamani-Faradonbe
      Abstract: Length–weight and length–length parameters were calculated for seven fish species belonging to five families in the Zohreh River, Iran. The weight–length relationships were estimated using the equation W = aLb. The b values varied between 2.72 and 3.33, with a mean ± SD of 2.88 ± 0.28. The b values parameter in the length–weight relationship equations were calculated as 3.15 for Alburnus mossulensis Heckel, 1843; 3.78 for Barilius mesopotamicus Berg, 1932; 2.86 for Cyprinion macrostomum Heckel, 1843; 2.89 for Nuchequula gerreoides (Bleeker, 1851); 2.80 for Mastacembelus mastacembelus (Banks & Solander, 1794); 2.72 for Liza abu (Heckel, 1843); and 3.19 for Paraschistura nielseni (Nalbant and Bianco, 1998). This study presents the first LWR and LLR references for these species in the Zohreh River.
      PubDate: 2017-01-10T07:35:33.323406-05:
      DOI: 10.1111/jai.13285
  • First record of the buccaneer anchovy Encrasicholina punctifer (Fowler,
           1938) (Clupeiformes; Engraulidae) in the Mediterranean Sea, confirmed
           through DNA barcoding
    • Authors: O. Çiftçi; A. Karahan, Y. AK Orek, A. E. Kideys
      PubDate: 2017-01-10T07:35:32.472087-05:
      DOI: 10.1111/jai.13276
  • Occurrence of Misgurnus anguillicaudatus (Cantor, 1842) (Cobitidae) in the
           Taquari River, Upper Paraná Basin, Brazil
    • Authors: A. B. Nobile; D. Freitas-Souza, F. P. Lima, I. L. Bayona Perez, S. G. C. Britto, I. P. Ramos
      PubDate: 2017-01-10T07:35:26.007202-05:
      DOI: 10.1111/jai.13279
  • Length–weight relationships for 35 fish species of the Atlantic
           Forest, SP/RJ—Brazil
    • Authors: F. P. Lima; A. B. Nobile, D. Freitas Souza, C. A. Siqueira, C. A. Lemos, B. Abreu-Santos, J. A. P. Santos
      Abstract: Length–weight relationships (LWRs) for 35 freshwater fish species from the SP/RJ coastal basin in Brazil are presented in this paper. Fishes were captured between 2011 and 2015 on an irregular basis using electrofishing, sieves, trawl nets, cast nets and fish-traps. In this study new LWRs are reported for 28 species, plus the total weight and length for 34 and nine species, respectively. The study provides new information on less-studied species and can serve as a basis for management and conservation in this area.
      PubDate: 2017-01-10T07:35:24.807363-05:
      DOI: 10.1111/jai.13265
  • Issue Information
    • Pages: 157 - 158
      PubDate: 2017-03-16T01:30:16.657261-05:
      DOI: 10.1111/jai.13352
  • Title page and Logo
    • Pages: 159 - 160
      PubDate: 2017-03-16T01:30:23.798806-05:
      DOI: 10.1111/jai.13350
  • TOC
    • Pages: 161 - 161
      PubDate: 2017-03-16T01:30:18.982739-05:
      DOI: 10.1111/jai.13351
  • Proceedings of the XVth European Congress of Ichthyology 2015 (Porto,
    • Authors: Alberto T. Correia; Steven E. Campana, Jeffrey M. Leis, Kenneth W. Able, Harald Rosenthal
      Pages: 162 - 162
      PubDate: 2017-03-16T01:30:17.125878-05:
      DOI: 10.1111/jai.13315
  • Otolith morphometry and microchemistry as habitat markers for juvenile
           Mugil cephalus Linnaeus 1758 in nursery grounds in the Valencian
           community, Spain
    • Authors: R. Callicó Fortunato; V. Benedito Durà, A. Volpedo
      Pages: 163 - 167
      Abstract: The aim of this study was to identify and characterize juvenile Mugil cephalus (flathead grey mullet) habitats in the Valencian community by means of otolith morphometry and microchemistry. Specimens (total length: 250–350 mm) were obtained from October 2011 to March 2012 with gill nets in two protected wetlands: the Parque Nartural de l'Albufera de Valencia (AV) (n = 45), a Mediterranean lake; and the Parque Natural Salinas de Santa Pola (SP) (n = 37), a coastal salt marsh. Otolith shape indices (circularity, rectangularity, aspect ratio, surface occupied by sulcus, ellipticity and form factor) and microchemistry (Sr/Ca and Ba/Ca ratios) were measured and compared as area markers. The chemical composition of the water in both areas was also obtained. Morphometric results showed, by an ANOVA with Bonferroni contrasts, that saccular otoliths from AV individuals had more edge complexity, hence a higher circularity index (p 
      PubDate: 2017-01-30T02:16:57.345071-05:
      DOI: 10.1111/jai.13291
  • Identification of adult and juvenile Atherina presbyter Cuvier, 1829 in a
           marine coastal area adjacent to Tagus estuary (NE Atlantic): A molecular
           tool for an ecological question
    • Authors: F. Almada; P. Carpi, F. Carlos, S. M. Francisco, A. M. Faria, R. Lungu, P. Duarte-Coelho, J. Neto, E. J. Gonçalves, J. I. Robalo
      Pages: 168 - 173
      Abstract: A simple PCR-RFLP consisting in the digestion of a fragment of the 12S ribosomal RNA (12SrRNA) with species-specific restriction enzymes (MboII and HinfI) was developed to distinguish northeastern Atlantic species in the genus Atherina. Unambiguous identification of morphologically similar sympatric species is frequently difficult, especially when younger specimens are included in the analysis. Genetic and morphological analysis of a total of 123 atherinids collected near the mouth of the Tagus estuary (west Portugal) confirmed that only Atherina presbyter (sand smelt) adults and juveniles are recurrently using these marine rocky habitats as spawning and nursery grounds, respectively. The importance of applying non-destructive methods is emphasized. In the future, the conditions involved in the transition from marine A. presbyter to estuarine/riverine A. boyeri should be further evaluated along with the ability of larvae and juveniles to cope with river flow and tidal currents drift.
      PubDate: 2017-02-08T07:30:59.247692-05:
      DOI: 10.1111/jai.13296
  • Disturbed fish fauna zonation as an indicator of large-scale human impact:
           A case study (2011–2012) of the large, lowland Warta River, Poland
    • Authors: A. Kruk; M. Ciepłucha, G. Zięba, D. Błońska, L. Marszał, S. Tybulczuk, M. Tszydel, T. Penczak
      Pages: 174 - 188
      Abstract: The aim of the study was to assess whether ichthyofauna variability follows the natural downstream gradient or the degradation gradient, and to assess the bioindication potential of fish zonation. The study was conducted along the entire length (795 km) of the lowland Warta River, Poland, wherein the complexity of the ecotone zone and availability of hiding places for fish decreased downstream. The catchment of the middle course carried a heavy load of pollutants. In the lower course, groynes were common, the channel width exceeded 100 m and the mean discharge reached 210 m3/s. In 2011–2012, single-run electrocatches of fish and lampreys were performed at 73 sites, generally while wading along 100 m long reaches of both riverbanks (farthest upper course, depth ≤ 0.6 m) or drifting in a boat along a 500 m riverbank stretch (in the remaining river parts). An indicator species analysis allowed identification of species associated significantly with particular river sections: one (a rheophil) in the source fragment (S1), seven (all rheophilic) in the upper course (S2), three in the middle course (S3), and nine (including three rheophils) in the lower course (S4). On this basis, the S1 was classified as an impoverished grayling zone, S2 as a barbel zone, and S4 as the bream zone. Section S3 remained unclassified, as its ichthyofauna was in the worst condition due to: (i) the strong destabilizing upstream impact of the Jeziorsko dam reservoir, (ii) large amounts of wastewater discharged from towns located in the catchment area of this section and (iii) the lack of unpolluted tributaries that could serve as sources of recolonizers. In summary, in the human-modified Warta River, the variability of fish assemblages followed a degradation gradient, which was also reflected in the disturbed fish zonation. Consequently, this study confirms the usefulness of a fish fauna zonation analysis for the bioindication of large-scale human impacts in rivers.
      PubDate: 2017-02-28T01:15:41.03277-05:0
      DOI: 10.1111/jai.13297
  • Discovery of a spawning area for anadromous Coilia nasus Temminck et
           Schlegel, 1846 in Poyang Lake, China
    • Authors: T. Jiang; J. Yang, M. J. Lu, H. B. Liu, T. T. Chen, Y. W. Gao
      Pages: 189 - 192
      PubDate: 2017-02-06T02:45:26.543986-05:
      DOI: 10.1111/jai.13293
  • Effect of body size on microhabitat preferences in stream-dwelling fishes
    • Authors: L. R. Manna; C. F. Rezende, R. Mazzoni
      Pages: 193 - 202
      Abstract: Microhabitat preferences of two stream-dwelling fish assemblages in two different Brazilian habitats of rainforest and semi-arid vegetation and comparisons within and between species were investigated. Data collection was from June to October 2012 in the Gato Stream within the rainforest, and from April to September 2012 in the Curu Stream within a semi-arid vegetation. Snorkeling observations and diving sessions along a 200-m stretch in each stream were performed. In total, 39 diving sessions were made over a total of 55 hr of underwater observations. Microhabitat preferences of the fish were analyzed by comparing resource use by fish species to the resource availability of the streams. Use of the microhabitat differed significantly between fish species within and between assemblages. In addition, there was a higher level of intraspecific variation in the fish assemblage in the semi-arid area. There was no significant correlation between fish size and microhabitat use, but five species showed a significant correlation between microhabitat use and distance from the stream bank. The findings herein point to highly intraspecific variability in both fish assemblages and highlight the importance of measuring individual differences in microhabitat preferences. Additionally, the versatility described for tropical freshwater fishes confirms the importance of measuring the intraspecific variability of their different ecological traits, and challenges the use of morphology as a predictor of fish ecology.
      PubDate: 2017-03-16T01:30:20.953015-05:
      DOI: 10.1111/jai.13320
  • Reproductive biology of the endemic dace Telestes karsticus Marčić and
           Mrakovčić, 2011 (Cyprinidae, Leuciscinae), in Croatia
    • Authors: Z. Marčić; A. Milković, M. Ćaleta, I. Buj, D. Zanella, P. Mustafić
      Pages: 203 - 208
      Abstract: This paper aims to establish how Telestes karsticus has adapted its reproductive behaviour to the hydrological conditions in Sušik Creek, which dries up in the summer. Initial data are provided on the reproductive biology of this endangered (EN) and endemic species of Croatia. Fish were collected at monthly intervals from July 2007 to July 2008 using a backpack electrofishing device. The spawning period lasts from late March to early May, confirmed by the gonadosomatic index (GSI) of males and egg diameter measurements. The value of GSI for both males and females is clearly cyclic, with only one maximum achieved in April. Sexual maturity is reached at an early age, with 50% becoming mature at total lengths longer than 41 mm (males) and 51 mm (females). Absolute fecundity of gravid females ranged from 201 to 3,188 eggs and relative fecundity was 153.6 ± 33.9 eggs per gram of body mass. Average egg diameter was determined as 1.22 ± 0.23 mm. The species is lithophilous, with eggs found in nature on gravel and among rocks. Water temperature during the spawning period ranged from 7.3°C to 13.5°C, with an average of 9.8°C. The spawning period coincides with the second peak of the 30-year-average water level in the creek, which runs dry during the summer period.
      PubDate: 2017-02-08T07:30:51.959891-05:
      DOI: 10.1111/jai.13306
  • Comparing androgens and androgen receptor expression in Cobitis taenia
           Linnaeus, 1958 males and females
    • Authors: A. Leska; A. Przybył, O. Jablonska, D. Juchno, A. Boroń, D. Pikuła, K. Kowalewska
      Pages: 209 - 216
      Abstract: It is assumed that males and females of spined loach, Cobitis taenia are characterized by different androgen receptor patterns of expression in some of the target tissues and by different concentrations of androgens during their reproductive season. Moreover, still little is examined as to whether tissue sensitivity to androgens follows the changes in androgen concentrations across the fish reproductive cycle. This was verified by determining androgen (testosterone and 11-ketotestosterone) concentrations in whole fish bodies using ELISA and analyzing AR gene expression in androgen target tissues (gonads, muscles and liver) using RT-PCR. The partial sequence of the AR gene in C. taenia was also identified. The study was conducted on the spined loach, Cobitis taenia – a multiple spawning species in decline, having hybridized with closely-related taxa to form allopolyploids. Males (18 individuals) and females (18) were collected from an exclusively diploid population (Legińskie Lake, Baltic Sea basin) in 2013 during pre-spawning (May), spawning (June) and post-spawning (August) seasons (six fish per sampling period per sex) using a fry trawl (with a 0.2 cm mesh). The reproductive status of the fish was verified by GSI and gonad histology. The results revealed seasonal variations in the concentration of androgens in C. taenia males and females as well as the dynamic, seasonal nature of AR gene expression in a tissue- and sex-dependent manner. Furthermore, a different seasonal profile of both androgens accompanied by a different pattern of AR expression in various tissues indicated complex physiological mechanisms engaged in AR regulation. These findings appear to be a good physiological basis for further studies using more advanced molecular techniques.
      PubDate: 2017-02-08T07:30:57.362681-05:
      DOI: 10.1111/jai.13295
  • Ontogenetic changes in otolith morphology and shape analyses in
           Chelidonichthys cuculus (Linnaeus, 1758) and Chelidonichthys lucerna (L.,
    • Authors: S. Montanini; M. Stagioni, E. Benni, M. Vallisneri
      Pages: 217 - 220
      PubDate: 2017-03-02T01:30:35.058708-05:
      DOI: 10.1111/jai.13299
  • Recent distribution and phenetics of Turkestan gudgeon Gobio lepidolaemus
           Kessler, 1872 in rivers of southern Kazakhstan (Central Asia)
    • Authors: D. Bekkozhayeva; N. Mamilov
      Pages: 221 - 224
      PubDate: 2017-02-18T02:10:26.604609-05:
      DOI: 10.1111/jai.13301
  • Reproductive biology of Cisalpine pike (Esox cisalpinus Bianco &
           Delmastro, 2011) in Lake Trasimeno (Italy)
    • Authors: L. Pompei; D. Pieracci, D. Giannetto, A. Carosi, C. Cauzillo, R. Dolciami, L. Ghetti, M. Lorenzoni
      Pages: 225 - 229
      Abstract: The aim of this study was analysis of the data on the reproductive biology of the endemic Esox cisalpinus from Lake Trasimeno (central Italy). Data were collected with gillnets (mesh sizes 50–100 mm) from 2010 to 2014 during the reproductive period of the species. Fish age was assessed by scalimetric method and their condition evaluated by relative condition factor. Gonado-Somatic Index, fecundity, relative fecundity and egg sizes were calculated. A total of 1,543 specimens (862 females, 681 males) ranging in size from 28.0 to 103.0 cm were examined. Age composition ranged from 2+ to 12+. Both males and females matured at 2 years of age, at 28 cm total length. Fecundity ranged from 1,540 to 160,300 eggs; mean relative fecundity was 18,815 eggs/kg. Males and females were all found to be in good condition, with the relative fecundity increasing with improvements in their body condition.
      PubDate: 2017-02-16T06:05:25.723443-05:
      DOI: 10.1111/jai.13294
  • Precision of age estimates in striped snakehead Channa striata (Bloch,
           1793) from the Ganga River and its tributaries (rivers Gomti and Yamuna)
    • Authors: M. Afzal Khan; Salman Khan, Shahista Khan
      Pages: 230 - 235
      PubDate: 2017-02-07T05:56:06.655876-05:
      DOI: 10.1111/jai.13300
  • Age and growth of European eel, Anguilla Anguilla (Linnaeus, 1758), in
           Estonian lakes
    • Authors: M. Silm; P. Bernotas, M. Haldna, A. Järvalt, T. Nõges
      Pages: 236 - 241
      Abstract: To investigate the difference in growth rates of eels in the studied water bodies (Võrtsjärv, Ülemiste, Saadjärv, Vagula, Kaiavere and Kuremaa lakes, all in Estonia), 828 individual eel otoliths from the years 1999–2004 and 2008–2012 were examined for age determination. Anguilla anguilla captured in Lake Võrtsjärv mostly by professional fyke nets (mesh size>36 mm in the cod end) showed the best growth rate (gR = 6.9 cm/year) and had a high Fulton condition factor (K = 0.19), indicating suitable growth conditions in the lake. However samples caught using the same type of gear from the smaller lakes situated near Võrtsjärv, showed much slower gR (3 cm/year) and lower K (0.17) growth rates. The slowest gR (2.6 cm/year) was observed for specimens caught in Lake Kuremaa. Stocking densities are much higher in the small lakes of the region and have a direct effect on the growth rates.
      PubDate: 2017-02-28T01:15:55.976229-05:
      DOI: 10.1111/jai.13314
  • Age, growth and sex of the shanny, Lipophrys pholis (Linnaeus, 1758)
           (Teleostei, Blenniidae), from the NW coast of Portugal
    • Authors: M. G. Carvalho; C. Moreira, H. Queiroga, P. T. Santos, A. T. Correia
      Pages: 242 - 251
      Abstract: Age, growth, sex and gonadal maturation of the shanny, Liphorys pholis, were determined in specimens caught in a rocky intertidal area in northern Portugal in order to provide essential ecological data on the species. This study represents the first available reference in the literature for L. pholis in a southern European location. Totals of 251 individuals (115 females, 99 males, 37 undetermined; total length: 30–172 mm) were collected seasonally (November 2013, March, June, and September 2014) in a northern Portuguese rocky beach (Póvoa do Varzim: 41°23′47.79″N; 08°46′45.48″W) using fine-mesh aquarium fishnets during low tides. Marginal increment analysis showed that one translucent and one opaque zone was formed each year in the sagittal otoliths. Ages of L. pholis ranged from 0 to 6 years. Males were larger and older than females. The von Bertalanffy growth equation parameters considering all individuals were L∞ = 184 mm, K = 0.26 mm/year, t0 = −1.34. The annual variation of the fish condition and hepatosomatic indexes appeared to be related to the mobilization of the somatic reserves prior to reproduction. Maximum gonadosomatic index for males and females coincided with the breeding seasons (November and March). The sex ratio was close to 1:1, all maturity stages included. Furthermore, some stages of sexual development in males and females were observed during the same season, and several germinal cells were also observed at the same time within a single ovary or testis, indicating that L. pholis is an asynchronous and multiple spawner. Maturation for both sexes appears to be around 70 mm TL and prior to reaching 1 year of age.
      PubDate: 2017-02-07T04:00:50.088347-05:
      DOI: 10.1111/jai.13307
  • An unusual central cavity in Odontoscion dentex (Cuvier, 1830) sagittal
    • Authors: F. A. Daros; H. L. Spach, A. T. Correia
      Pages: 252 - 255
      PubDate: 2017-02-06T05:55:50.191894-05:
      DOI: 10.1111/jai.13308
  • Morphological comparison of Delminichthys ghetaldii (Steindachner, 1882),
           D. adspersus (Heckel, 1843), D. jadovensis (Zupančič & Bogutskaya, 2002)
           and D. krbavensis (Zupančič & Bogutskaya, 2002), endemic species of the
           Dinaric karst, Croatia
    • Authors: P. Mustafić; I. Buj, M. Opašić, D. Zanella, Z. Marčić, M. Ćaleta, R. Šanda, S. Horvatić, M. Mrakovčić
      Pages: 256 - 262
      Abstract: The objectives of this study were to gain a new understanding of the morphology of four endemic Delminichthys species, to determine the presence of morphological differences among populations and species, and to reveal reductive characters that might be connected with underground migrations. Morphometric and meristic characters were measured and statistically compared between populations and species. The study was conducted in the Dinaric region of Croatia and Bosnia and Herzegovina in the year 2013. Interpopulation variability observed for body shape (all size-independent morphometric characters significantly differed among populations) could be a reflection of the varying ecological conditions, although it might also imply the isolation of populations belonging to the same species. The number of lateral line scales (21–37 in D. krbavensis, 47–63 in D. jadovensis, 52–74 in D. adspersus, 88–105 in D. ghetaldii) proved to be the best diagnostic character for the Delminichthys species. Nevertheless, differences among the species in the number of pectoral and ventral fin rays, colouration, appearance of the lateral line, position of the mouth and presence of the groove above the upper lip were also observed.
      PubDate: 2017-02-08T07:30:54.594-05:00
      DOI: 10.1111/jai.13304
  • Anatomy of the olfactory bulb in Greenland shark Somniosus microcephalus
           (Bloch & Schneider, 1801)
    • Authors: S. Ferrando; L. Gallus, L. Ghigliotti, M. Vacchi, A. Amaroli, J. Nielsen, J. S. Christiansen, E. Pisano
      Pages: 263 - 269
      Abstract: Gross morphology and histology of the olfactory rosette of Greenland shark Somniosus microcephalus (Bloch & Schneider, 1801), suggest a well-developed olfactory capability for this top predator and scavenger native to Arctic waters. In the present paper, observations on the olfactory rosette are reported together with the gross morphology and histology of the olfactory bulb whereby the histological analyses revealed some peculiar traits. The olfactory bulb is macroscopically divided into two sub-bulbs and a central undivided part that contain the layers typical of olfactory bulb histology. The two visible sub-bulbs are actually bundles of fila olfactoria. In addition, the olfactory lateral ventricle is peculiarly branched, which may increase the ependymal surface or, alternatively, decrease the distance between the tissues of the olfactory bulb and the ventricle itself. The ependymal surface is known to be a proliferative zone in the olfactory bulb of fishes. In Greenland shark, the olfactory epithelium showed frequent mitosis and apoptosis highlighting the importance of this site in cell renewal. This issue should be pursued further to gain a deeper understanding of the sensory biology of Greenland shark and of elasmobranchs in general.
      PubDate: 2017-02-08T07:31:09.292553-05:
      DOI: 10.1111/jai.13303
  • Do all long supermaxilla-type estuarine tapertail anchovies (Coilia nasus
           Temminck et Schlegel, 1846) migrate anadromously'
    • Authors: T. T. Chen; T. Jiang, H. B. Liu, M. M. Li, J. Yang
      Pages: 270 - 273
      PubDate: 2017-02-08T07:30:44.713119-05:
      DOI: 10.1111/jai.13309
  • Occurrence and distribution of exotic fishes in the Tiber River basin
           (Umbria, central Italy)
    • Authors: A. Carosi; L. Ghetti, C. Cauzillo, L. Pompei, M. Lorenzoni
      Pages: 274 - 283
      Abstract: The purpose of this research was to analyze the abundance and distribution of four recently introduced fish species in the Tiber River basin: Gobio gobio, Luciobarbus graellsii, Rutilus rutilus, and Rhodeus sericeus. An additional aim was to evaluate the relationships of these species with environmental factors. The study area comprised 92 watercourses in the Umbrian portion of the Tiber River basin and analyzed data collected during 1990–2014, in 158 sampling sites. The results show that all four species were quickly established, with self-sustaining populations revealing invasive characteristics. In just a few years these species extended their distribution significantly in the study area; they preferentially colonized the lower reaches of rivers characterized by warmer waters and a slow current rate and were also associated with poor environmental quality conditions. The research results provide valuable information useful for risk assessment as well as for the design of proper invasive species management programs.
      PubDate: 2017-02-17T02:10:34.014331-05:
      DOI: 10.1111/jai.13302
  • Occurrence of Knipowitschia goerneri Ahnelt, 1991 (Gobiidae) in southern
           Albania confirmed with molecular tools
    • Authors: J. Vukić; D. Ulqini, R. Šanda
      Pages: 284 - 290
      Abstract: The aim of this work was to identify the newly discovered population of Knipowitschia from southern Albania using molecular methods. Samples were collected from the Butrint Lagoon catchment with seine nets. Mitochondrial cytochrome b and nuclear ribosomal protein gene (S7) were analyzed. A nuclear marker was used for the first time to study relationships between and among Knipowitschia species. The results show that the population from Albania belongs to Knipowitschia goerneri Ahnelt, 1991 (Corfu dwarf goby), a species previously thought to be endemic to the Korission Lagoon catchment on Kerkyra Island, Greece. Based on both mitochondrial and nuclear markers, this species was recovered in a well-supported Ionian clade also comprising Knipowitschia milleri (Ahnelt & Bianco, 1990) (Acheron spring goby) from the Acheron River and the Knipowitschia population from Trichonis Lake.
      PubDate: 2017-02-02T23:59:30.932978-05:
      DOI: 10.1111/jai.13298
  • Delayed effect of geomagnetic storm simulation on size, mass and activity
           of digestive glycosidases in roach (Rutilus rutilus Linnaeus, 1758)
    • Authors: I. L. Golovanova; A. A. Filippov, Yu. V. Chebotareva, Yu. G. Izyumov, V. V. Krylov
      Pages: 291 - 299
      Abstract: This study aim was finding delayed consequences of the main phase impact and initial recovery period phase of a typical geomagnetic storm (MRGMS) experimentally reproduced in the range of 0–0.001 Hz on roach (Rutilus rutilus L., 1758) embryos. Roe and sperm were collected from four females and eight males caught in the Rybinsk reservoir, to achieve phenetic diversity in the resulting offspring. Mean water temperature during fertilization and embryo incubation was 18.02°C. The embryos were exposed before (1–6 hr post-fertilization) and after (33–39 hr post-fertilization) gastrulation to MRGMS with intensities of 100, 300 and 500 nT, which corresponded to the main phase and initial recovery period phase of typical moderate, strong and severe geomagnetic storms. After this exposure, body mass, standard length, mass and length of the intestine, plus activity, temperature and kinetic characteristics of digestive glycosidases were evaluated in four-month-old underyearlings (standard length 5.57–8.66 cm, body mass 3.08–12.01 g) developed from exposed embryos. Standard length and mass were lower in fish exposed to different MRGMS following gastrulation. In general, when compared to the controls, the activity of maltase was lower and activity of sucrase higher in fish exposed to different MRGMS before and after gastrulation. Maximal differences between experimental and control groups were caused by an impact of the simulation that corresponded to a moderate geomagnetic storm. After the influence of studied simulations was introduced, adaptive changes in digestive glycosidases were revealed, including an increase of enzymes affinity for the substrate, an enlargement of maltase temperature optimum and a decrease of maltase Eact in the range of environmental temperatures. The magnitude and direction of observed effects depended on the MRGM intensity and the time intervals in embryogenesis when the exposures were carried out.
      PubDate: 2017-02-08T07:31:15.043175-05:
      DOI: 10.1111/jai.13290
  • Nitrite toxicity in juvenile Goodeinae fishes Skiffia multipunctata
           (Pellegrin, 1901) and Goodea atripinnis (Jordan, 1880)
    • Authors: R. A. Rueda-Jasso; A. De los Santos-Bailón, A. Campos-Mendoza
      Pages: 300 - 305
      Abstract: Lethal concentration (LC50) and sub-lethal effects of NO2-N on the endemic viviparous fishes Skiffia multipunctata (Pellegrin, 1911) (SM; considered threatened under Mexican regulations) and Goodea atripinnis (Jordan, 1880) (GA; without conservation status) were determined. LC50/96 hr values were 0.002 and 0.359 mg NO2-N/L for SM and GA, respectively. Sub-lethal exposure resulted in swelling of the gill epithelium, hyperplasia, fusion of the primary and secondary lamellae, erythrocyte pyknosis, and aneurysms with respiratory stress responses at 0.0012 and 0.244 mg NO2-N/L for SM and GA. The study demonstrates that sensitivity of both species is strongly related to the conservation status and acceptable nitrite concentrations, which are clearly below those permitted by the Mexican national water quality norm for wildlife preservation. Therefore, this norm is not adequate protection for these species, and where other threatened species may also be affected. Adequate criteria for nitrites in Mexican waters should include the data of all threatened endemic species.
      PubDate: 2017-02-16T05:35:36.379536-05:
      DOI: 10.1111/jai.13292
  • Differences in spatial communities of European perch (Perca fluviatilis
           Linnaeus, 1758) fry in a canyon-shaped reservoir are not attributable to
    • Authors: L. Kalous; P. Kuříková, J. Kohout, K. Rylková, M. Petrtýl, M. Čech
      Pages: 306 - 313
      Abstract: The question was whether a canyon-shaped reservoir is inhabited by genetically distinct populations of European perch Perca fluviatilis exhibiting different spatial behaviour, or by a single population. The study was conducted in the spring of 2006 at Římov Reservoir, Czech Republic. Epipelagic and bathypelagic perch fry (EPF and BPF) were captured by trawl net (mesh size 1 × 1.35 mm) controlled by echo sounder, and littoral perch fry and adults (LPF and LPA) were caught by electrofishing and beach seine (mesh size 1 × 1.35 mm). DNA was isolated in 266 individuals from the reservoir, and phylogenetic analysis based on mtDNA was performed (n = 18) on BPF, EPF, LPF, and LPA from the reservoir and additional sequences from Central Europe. Six microsatellites were used for differentiating among communities (n = 266). There was no evidence for genetic divergence in mtDNA sequences. Analyses of microsatellites revealed no statistically significant variations between spatial communities, and confirmed genetic homogeneity among communities. FST values and the number of genetic clusters point to the same conclusion, i.e., the reservoir is inhabited by a single population whose individuals occupy different microhabitats.
      PubDate: 2017-02-08T07:30:42.403208-05:
      DOI: 10.1111/jai.13305
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