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Journal of Fish Biology

S Pearish, L Hostert, A M Bell
A method for quantifying consistent individual differences in schooling behaviour is presented. This method, which utilizes a school of models, improves on previous methods by removing the unwanted variation that is introduced by live stimulus fish while still providing the physiological experience of schooling to the focal fish. Three-spined stickleback Gasterosteus aculeatus observed in the model school assay exhibited consistent individual differences in schooling behaviour.
October 21, 2016: Journal of Fish Biology
B B Calegari, R E Reis
A new species of Gelanoglanis is described based on specimens collected in the Tocantins River, a tributary of the Amazon Basin. The new species is distinguished from congeners by unusual features to the genus such as the pelvic fin falling short of the urogenital opening by a distance larger than the anal-fin length, the first unbranched dorsal and pectoral-fin rays not ossified as spines, the dorsal-fin spinelet absent and the adipose fin in adults preceded by a long fleshy ridge. The new species is further distinguished from congeners by its soft, sinuous snout tip and morphometric proportions of the body and head...
October 21, 2016: Journal of Fish Biology
J Casey, E Jardim, J Th Martinsohn
Exploitation of fish and shellfish stocks by the European Union fishing fleet is managed under the Common Fisheries Policy (CFP), which aims to ensure that fishing and aquaculture are environmentally, economically and socially sustainable and that they provide a source of healthy food for E.U. citizens. A notable feature of the CFP is its legally enshrined requirement for sound scientific advice to underpin its objectives. The CFP was first conceived in 1970 when it formed part of the Common Agricultural Policy...
October 19, 2016: Journal of Fish Biology
E Kelly, S Gibson-Kueh
This study reports the presence of large mucous cells lining the large renal collecting ducts and opisthonephric ducts of the Australian freshwater catfishes Tandanus tandanus and Tandanus tropicanus. Histologic examination of the renal tissue from four other species of Australian freshwater catfishes suggests that this feature is unique to the two species of Tandanus studied. The potential functions of renal mucous secretion in T. tandanus and T. tropicanus are discussed.
October 18, 2016: Journal of Fish Biology
E Garcia-Mayoral, M Olsen, R Hedeholm, S Post, E E Nielsen, D Bekkevold
In this study, 11 microsatellite markers were used to determine the structure of West Greenlandic lumpfish Cyclopterus lumpus populations across six spawning locations spanning >1500 km and compared with neighbouring populations in Canada and Iceland. To evaluate whether data allow for identification of origin of C. lumpus in Greenlandic waters, genetic assignment analysis was performed for 86 C. lumpus sampled on a feeding migration. Significant structuring with isolation by distance was observed in the West Greenland samples and two major subpopulations, north and south, were suggested...
October 17, 2016: Journal of Fish Biology
J Martins, F Almada, A Gonçalves, P Duarte-Coelho, P E Jorge
The ability to be faithful to a particular area or site was analysed in the shanny Lipophrys pholis. Using passive integrated transponders, adults from a population of L. pholis at Cabo Raso, Portugal, were followed over a period of 3 years. The findings showed that site fidelity is a consistent behaviour during the breeding season with specific breeding males being found only in particular sectors within the area, and in specific nests throughout the years. The fact that, in general, L. pholis individuals were absent from the study area during the non-breeding season and breeding males were recorded returning to the same nests and sectors for consecutive breeding seasons suggests that they have developed excellent homing abilities...
October 16, 2016: Journal of Fish Biology
L M Oliveira, T Knebelsberger, M Landi, P Soares, M J Raupach, F O Costa
A large-scale comprehensive reference library of DNA barcodes for European marine fishes was assembled, allowing the evaluation of taxonomic uncertainties and species genetic diversity that were otherwise hidden in geographically restricted studies. A total of 4118 DNA barcodes were assigned to 358 species generating 366 Barcode Index Numbers (BIN). Initial examination revealed as much as 141 BIN discordances (more than one species in each BIN). After implementing an auditing and five-grade (A-E) annotation protocol, the number of discordant species BINs was reduced to 44 (13% grade E), while concordant species BINs amounted to 271 (78% grades A and B) and 14 other had insufficient data (grade D)...
October 14, 2016: Journal of Fish Biology
S K Stell, P Moller
This osteological survey of 249 specimens of Brevimyrus niger ranging in size from 44 to 137 mm standard length (LS ) demonstrated that developmental changes in anal-fin morphology can serve as a predictor of sexual maturity in this species. Anal-fin ray bases begin to expand when fish reach c. 90 mm LS at which size and above there were roughly equal numbers of individuals observed with expanded and unmodified anal-fin bases, reflecting a 1:1 sex ratio.
October 14, 2016: Journal of Fish Biology
W M Koster, D R Dawson, C Liu, P D Moloney, D A Crook, J R Thomson
In this study, linkages were examined between movement and spawning behaviour for golden perch Macquaria ambigua in a lowland river by integrating acoustic telemetry and egg and larval drift sampling over 4 years. Movement was strongly seasonal, being most prevalent during the spawning season (spring to early summer), and occurred primarily downstream into the lower river reaches during elevated flows. A very strong association was found between the occurrence of spawning and long-distance M. ambigua movement...
October 13, 2016: Journal of Fish Biology
J E Skjaeraasen, J A Devine, J A Godiksen, M Fonn, H OtterÅ, O S Kjesbu, B Norberg, Ø Langangen, Ø Karlsen
Wild caught North Sea saithe Pollachius virens were monitored for growth, sex steroid profiles and oocyte development pre-spawning and measured for egg size and group fecundity during the spawning season in the laboratory. Vitellogenesis commenced in late October-early November, at a leading cohort size (CL ) of c. 250 µm, after which oocytes grew rapidly in size until spawning started in February. Notably, a distinct cortical alveoli stage was virtually absent with yolk granules observed in developing oocytes at the very beginning of vitellogenesis...
October 13, 2016: Journal of Fish Biology
K B Burgess, M B Bennett
Ethanol storage and lipid and urea extraction had no effect on bluespotted maskray Neotrygon kuhlii muscle δ(13) C values whereas urea-removal and ethanol storage increased δ(15) N values. Results presented here show a significant δ(15) N increase post-urea removal and provide additional support for this approach in future elasmobranch stable-isotope analysis (SIA) studies. Further experimental work on other elasmobranch species is needed to assess extraction and preservation effects on stable-isotope (SI) values...
October 12, 2016: Journal of Fish Biology
M J Hansen, P M O'Leary, A J W Ward
This study employed community analysis and behavioural field observations to explore the inter-specific interactions between fangblenny species (Plagiotremus spp.), the cleaner wrasse Labroides dimidiatus and their target species and found that the presence of Plagiotremus spp. did not affect the total amount that L. dimidiatus cleaned but it did reduce the amount L. dimidiatus cleaned key prey species of the Plagiotremus spp. The behavioural interactions between adult L. dimidiatus and their clients changed in response to the presence of Plagiotremus spp...
October 12, 2016: Journal of Fish Biology
E Verspoor, D Knox, S Marshall
An eclectic set of tissues and existing data, including purposely collected samples, spanning 1997-2006, was used in an ad hoc assessment of hybridization and introgression of farmed wild Atlantic salmon Salmo salar in the small Loch na Thull (LnT) catchment in north-west Scotland. The catchment is in an area of marine farm production and contains freshwater smolt rearing cages. The LnT S. salar stock was found to be genetically distinctive from stocks in neighbouring rivers and, despite regular reports of feral farm S...
October 12, 2016: Journal of Fish Biology
T Portella, J Lobón-Cerviá, L R Manna, H G Bergallo, R Mazzoni
The head morphology and feeding habits of pairs of characin species (family Characidae) that coexist in four different coastal rainforest streams were analysed. Coexisting species differed in size, but were very similar in eco-morphological attributes. Gut analyses revealed differences in feeding preferences for each coexisting species, indicating resource partitioning. A pattern of organization in species pairs that was repeated in the four studied streams was noticed. The pattern consisted of one slightly larger species with a feeding preference for items of allochthonous origin and another smaller species with a preference for autochthonous items...
October 12, 2016: Journal of Fish Biology
C M Wen, M M Chen, F H Nan, C S Wang
In this study, cultures of neural stem-progenitor cells (NSPC) from the brain of green terror cichlid Aequidens rivulatus were established and various NSPCs were demonstrated using immunocytochemistry. All of the NSPCs expressed brain lipid-binding protein, dopamine- and cAMP-regulated neuronal phosphoprotein 32 (DARPP-32), oligodendrocyte transcription factor 2, paired box 6 and sex determining region Y-box 2. The intensity and localisation of these proteins, however, varied among the different NSPCs. Despite being intermediate cells, NSPCs can be divided into radial glial cells, oligodendrocyte progenitor cells (OPC) and neuroblasts by expressing the astrocyte marker glial fibrillary acidic protein (GFAP), OPC marker A2B5 and neuronal markers, including acetyl-tubulin, βIII-tubulin, microtubule-associated protein 2 and neurofilament protein...
October 11, 2016: Journal of Fish Biology
J J Piccolo
Using the examples on hereditary and environmental factors affecting salmonid populations, this paper demonstrates that ecologists have long appreciated the importance of local adaptation and intraspecific diversity for salmonid conservation. Conservationists, however, need to embrace the genomics revolution and use new insights to improve salmonid management. At the same time, researchers must be forthcoming with the uses and limitations of genomics, and conservation must move forward in the face of scientific uncertainty...
October 11, 2016: Journal of Fish Biology
M Grande, H Murua, I Zudaire, E J Arsenault-Pernet, F Pernet, N Bodin
The lipid composition of somatic and reproductive tissues was determined for female skipjack tuna Katsuwonus pelamis caught in the western Indian Ocean between latitude 10° N and 20° S and longitude 40° and 70° E. The highest total lipid (TL) contents were in the liver and gonads, with white muscle levels approximately three-fold lower. Three lipid classes dominated: triacylglycerols (TAG), sterol esters and wax esters (SE-WE) and phospholipids (PL). Collectively, these accounted for between 70 and 80% of TLs...
October 11, 2016: Journal of Fish Biology
J R Ovenden, G M Leigh, D C Blower, A T Jones, A Moore, C Bustamante, R C Buckworth, M B Bennett, C L Dudgeon
Sustainable exploitation of fisheries populations is challenging to achieve when the size of the population prior to exploitation and the actual numbers removed over time and across fishing zones are not clearly known. Quantitative fisheries' modeling is able to address this problem, but accurate and reliable model outcomes depend on high quality input data. Much of this information is obtained through the operation of the fishery under consideration, but while this seems appropriate, biases may occur. For example, poorly quantified changes in fishing methods that increase catch rates can erroneously suggest that the overall population size is increasing...
October 11, 2016: Journal of Fish Biology
A Suda, N Nagata, A Sato, Y Narimatsu, H H Nadiatul, M Kawata
The population structure of the Pacific cod Gadus macrocephalus was examined using 15 microsatellite loci and mitochondrial DNA (ND2 region). In total, 274 individuals were sampled from 16 locations around Japan to estimate the level of genetic differentiation and effective population size (Ne ). Pairwise FST , analysis of molecular variance and Bayesian clustering analysis suggested the presence of two genetically distinct groups in waters around Japan, with a higher Ne value in the eastern group than in the western group...
October 9, 2016: Journal of Fish Biology
V Sans-Coma, C Rodríguez, M A López-Unzu, M Lorenzale, B Fernández, L Vida, A C Durán
As far as is known, this paper gives the first description of a two-headed shark embryo belonging to an oviparous species, Galeus atlanticus (Carcharhiniformes: Scyliorhinidae). The specimen was detected among 797 embryos intended for cardiovascular studies, which represents a defect incidence of 0·13%. Each head had a mouth, two eyes, a brain, a notochord and five gill openings on each side. The two heads fused behind the gills. On the single body, there were four anticipated dorsal fins, two anterior, right and left and two posterior, right and left...
October 9, 2016: Journal of Fish Biology
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