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Journal of Fish Biology

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https://www.readbyqxmd.com/read/28608420/reproductive-strategy-spawning-induction-spawning-temperatures-and-early-life-history-of-captive-sicklefin-chub-macrhybopsis-meeki
#1
J L Albers, M L Wildhaber
Macrhybopsis reproduction and propagule traits were studied in the laboratory using two temperature regimes and three hormone treatments to determine which methods produced the most spawns. Only sicklefin chub Macrhybopsis meeki spawned successfully although sturgeon chub Macrhybopsis gelida released unfertilized eggs. All temperature and hormone treatments produced M. meeki spawns, but two treatments had similar success rates at 44 and 43%, consisting of a constant daily temperature with no hormone added, or daily temperature fluctuations with hormone added to the water...
June 13, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28593686/hypostomus-sertanejo-siluriformes-loricariidae-new-armoured-catfish-species-from-north-eastern-brazil
#2
C H Zawadzki, T P A Ramos, M Sabaj
A re-evaluation of the armoured catfish species of Hypostomus in the Rio Jaguaribe, north-eastern Brazil, was prompted by the discovery of specimens with pale spots on a dark background collected from that basin c. 1936 and deposited at the Academy of Natural Sciences of Philadelphia. Recent field collections in the Rio Jarguaribe basin confirmed the presence of the pale-spotted specimens and its distinctiveness as a new species. Hypostomus sertanejo n. sp. is diagnosed from other species of Hypostomus by having fins and dermal-plated regions of head and body with pale spots or vermiculations on darker background, teeth slender, asymmetrically bicuspid and numerous (34-75) on dentary and premaxilla, depressed dorsal-fin spine not reaching adipose spine, unbranched pectoral-fin spine longer than unbranched pelvic-fin ray, seven branched dorsal-fin rays and one (rarely two) predorsal plate(s) bordering supraoccipital...
June 7, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28593647/diets-and-trophic-guilds-of-small-fishes-from-coastal-marine-habitats-in-western-taiwan
#3
J P Egan, U-S Chew, C-H Kuo, V Villarroel-Diaz, P J Hundt, N G Iwinski, M P Hammer, A M Simons
The diets and trophic guilds of small fishes were examined along marine sandy beaches and in estuaries at depths <1·5 m in western Taiwan, Republic of China. Copepods were the most frequently identified item in fish guts, indicating they are key prey for the fish assemblages studied. Piscivore, crustacivore, detritivore, omnivore, zooplanktivore and terrestrial invertivore trophic guilds were identified. The zooplanktivore guild contained the most fish species. Maximum prey size consumption was positively correlated with standard length (LS ) in seven species and at the assemblage level and negatively correlated with LS in a single detritivorous species...
June 7, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28593636/biosynthesis-of-1%C3%AE-hydroxycorticosterone-in-the-winter-skate-leucoraja-ocellata-evidence-to-suggest-a-novel-steroidogenic-route
#4
J Wiens, R Ho, A K Brassinga, C A Deck, P J Walsh, R N Ben, K Mcclymont, T Charlton, A N Evans, W G Anderson
The present study explores the ability of intracellular bacteria within the renal-inter-renal tissue of the winter skate Leucoraja ocellata to metabolize steroids and contribute to the synthesis of the novel elasmobranch corticosteroid, 1α-hydroxycorticosterone (1α-OH-B). Despite the rarity of C1 hydroxylation noted in the original identification of 1α-OH-B, literature provides evidence for steroid C1 hydroxylation by micro-organisms. Eight ureolytic bacterial isolates were identified in the renal-inter-renal tissue of L...
June 7, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28589699/genetic-relationships-of-plagioscion-squamosissimus-perciformes-sciaenidae-from-five-neotropical-river-basins-evaluated-using-mitochondrial-atpase6-8-gene-sequences
#5
N A Diamante, S M A P Prioli, A V Oliveira, T M C Fabrin, L M Prioli, A J Prioli
The genetic relationships of native or introduced Plagioscion squamosissimus in five Brazilian Neotropical basins were evaluated using the mitochondrial atpase6/8 genes. Results revealed that the population of the Tocantins River basin is more basal than the native populations of the Amazon and Parnaíba River basins. Moreover, the populations of P. squamosissimus that were introduced in the São Francisco and upper Paraná River basins originated from the population of the Parnaíba River.
June 6, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28589694/can-members-of-the-south-western-gila-robusta-species-complex-be-distinguished-by-morphological-features
#6
C J Moran, M W O'Neill, J W Armbruster, A C Gibb
The goal for this project was to re-examine key morphological characters hypothesized to differentiate Gila intermedia, Gila robusta and Gila nigra and outline methods better suited for making species designations based on morphology. Using a combination of meristic counts, morphological measurements and geometric morphometrics, morphological dissimilarities were quantified among these three putative species. Traditional meristic counts and morphological measurements (i.e. distances between landmarks) were not useful for species identification...
June 6, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28556094/reduced-growth-in-wild-juvenile-sockeye-salmon-oncorhynchus-nerka-infected-with-sea-lice
#7
S C Godwin, L M Dill, M Krkošek, M H H Price, J D Reynolds
Daily growth rings were examined in the otoliths of wild juvenile sockeye salmon Oncorhynchus nerka to determine whether infection by ectoparasitic sea lice Caligus clemensi and Lepeophtheirus salmonis was associated with reduced host body growth, an important determinant of survival. Over 98% of the sea lice proved to be C. clemensi and the fish that were highly infected grew more slowly than uninfected individuals. Larger fish also grew faster than smaller fish. Finally, there was evidence of an interaction between body size and infection status, indicating the potential for parasite-mediated growth divergence...
May 29, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28555871/microanatomical-diversification-of-the-zona-pellucida-in%C3%A2-aplochelioid-killifishes
#8
A W Thompson, A I Furness, C Stone, C M Rade, G Ortí
This study investigates zona pellucida (ZP) ultrastructure in fertilized eggs of annual killifishes (suborder Aplocheiloidei), a group of highly specialized fishes that are able to survive desiccation for several weeks to months before they hatch. Little is known about ZP or chorionic ultrastructure sustaining these life-history modes, so scanning electron microscopy (SEM) was used to describe this trait in a large number of aplocheiloids with a focus on the family Rivulidae and the genus Hypsolebias. New images of ZP ultrastructure for 52 aplocheiloid species are provided, more than doubling the number characterized thus far...
May 28, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28555836/dietary-composition-and-prey-selectivity-of-juvenile-porcupine-rays-urogymnus-asperrimus
#9
C Elston, R G von Brandis, P D Cowley
Fifty-five juvenile porcupine ray Urogymnus asperrimus were collected in the isolated St Joseph Atoll, Seychelles. Stomach contents were sampled using non-lethal gastric lavage to determine the dietary composition, degree of prey selectivity and whether sex or size affected their diet. Sediment samples were collected to quantify prey availability so that prey selectivity could be estimated. Two phyla (Sipuncula and Nemertea) and 11 polychaete and crustacean families were recorded in stomach contents. Juvenile U...
May 28, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28547800/mass-spawning-aggregation-of-the-giant-bumphead-parrotfish-bolbometopon-muricatum
#10
G Roff, C Doropoulos, G Mereb, P J Mumby
The present study reports a previously undocumented mass spawning aggregation and group spawning phenomena of c. 1200 individual bumphead parrotfish Bolbometopon muricatum in Palau, Micronesia. Although B. muricatum are protected in Palau, it is further recommended that management strategies should consider establishment of no-take zones at B. muricatum spawning aggregations and concomitant sleeping grounds elsewhere.
May 25, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28543076/reproductive-characteristics-of-pike-characids-boulengerella-cuvieri-ctenoluciidae-in-the-middle-xingu-river-eastern-amazon
#11
Y A Mendes, M A P Ferreira, C M C Lobato, G M F Silva, L F A Montag, R M Rocha
This study evaluated the reproductive characteristics of pike-characids, Boulengerella cuvieri, during the hydrological cycle in the Xingu River, eastern Amazon. The sex ratio was 1:1 and the gonado-somatic index and relative frequency of maturation stages indicate a short breeding season of single phase spawning that coincides with a filling and flood period. Mean standard length at first sexual maturity for female B. cuvieri was estimated to be 22·9 cm.
May 24, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28542850/reproductive-biology-of-black-seabream-acanthopagrus-schlegelii-threadfin-porgy-evynnis-cardinalis-and-red-pargo-pagrus-major-in-the-northern-south-china-sea-with-consideration-of-fishery-status-and-management-needs
#12
C S W Law, Y Sadovy de Mitcheson
The reproductive biology of three commercially significant seabream species (family: Sparidae) Acanthopagrus schlegelii, Evynnis cardinalis and Pagrus major, taken from Hong Kong and adjacent northern South China Sea (SCS) waters, were investigated for their sexual patterns, spawning seasons, length at maturity and exploitation in relation to their conservation and management status. Histological analysis showed E. cardinalis and P. major to be functionally gonochoristic, the latter having a bisexual juvenile stage and being a rudimentary hermaphrodite...
May 23, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28543274/diel-and-seasonal-movements-of-silver-eels-anguilla-dieffenbachii-emigrating-from-a-lake-subject-to-hydro-electric-control
#13
D J Jellyman, M J Unwin
To investigate the behaviour and fate of silver female longfin eels Anguilla dieffenbachii in relation to flow variations from New Zealand's largest (700 MW) hydro-electric station, 210 A. dieffenbachii were tagged with acoustic transmitters during summer and autumn over 6 years from 2005 to 2010. A shoreline array of receivers (2005-2008) was supplemented by positioning systems near the power station and natural outlet (2009-2010) that enabled continuous tracking of A. dieffenbachii within these areas...
May 22, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28543020/morphological-and-functional-aspects-of-the-epidermis-of-the-sea-lamprey-petromyzon-marinus-throughout-development
#14
R Rodríguez-Alonso, M Megías, M A Pombal, P Molist
The development of the epidermis of sea lamprey Petromyzon marinus along the whole life cycle was studied using conventional staining techniques and lectin histochemistry. The epidermis undergoes variations in morphology and thickness throughout development. The simple cuboidal epithelium found in the epidermis of prolarvae becomes stratified cubic in the adult by increasing the number of cell layers. The cuticle thickness undergoes a steady increase during the larval period. There are changes in the glycoconjugate composition of the three main cell types of the P...
May 22, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28542802/comparison-of-nine-different-methods-to-assess-fish-communities-in-lentic-flood-plain-habitats
#15
M Mueller, J Pander, J Knott, J Geist
This study compares the effectiveness and representativeness of electrofishing, snorkelling, seining, baited lift netting, multi-mesh gillnetting, baited fish traps, fyke netting, angling and longline fishing, considering three typical lentic flood-plain habitats at different times of day. Electrofishing was by far the most effective method yielding highest species richness, species trait representation and catch per unit of effort (CPUE), followed by seining. For single species like dace Leuciscus leuciscus, European ruffe Gymnocephalus cernua, common bream Abramis brama and silver bream Blicca bjoerkna, seining was more effective than electrofishing...
May 22, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28523791/genetic-assessment-of-the-effects-of-streamscape-succession-on-coho-salmon-oncorhynchus-kisutch-colonization-in-recently-deglaciated-streams
#16
K T Scribner, C Soiseth, J McGuire, G K Sage, L Thorsteinson, J L Nielsen, E Knudsen
Measures of genetic diversity within and among populations and historical geomorphological data on stream landscapes were used in model simulations based on approximate Bayesian computation (ABC) to examine hypotheses of the relative importance of stream features (geomorphology and age) associated with colonization events and gene flow for coho salmon Oncorhynchus kisutch breeding in recently deglaciated streams (50-240 years b.p.) in Glacier Bay National Park (GBNP), Alaska. Population estimates of genetic diversity including heterozygosity and allelic richness declined significantly and monotonically from the oldest and largest to youngest and smallest GBNP streams...
May 19, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28516502/differential-effects-of-exposure-to-parasites-and-bacteria-on-stress-response-in-turbot-scophthalmus-maximus-simultaneously-stressed-by-low-water-depth
#17
J J Rodríguez-Quiroga, C Otero-Rodiño, P Suárez, T P Nieto, J M García Estévez, F San Juan, J L Soengas
The stress response of turbot Scophthalmus maximus was evaluated in fish maintained 8 days under different water depths, normal (NWD, 30 cm depth, total water volume 40 l) or low (LWD, 5 cm depth, total water volume 10 l), in the additional presence of infection-infestation of two pathogens of this species. This was caused by intraperitoneal injection of sublethal doses of the bacterium Aeromonas salmonicida subsp. salmonicida or the parasite Philasterides dicentrarchi (Ciliophora:Scuticociliatida)...
May 17, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28516498/non-parallel-divergence-across-freshwater-and-marine-three-spined-stickleback-gasterosteus-aculeatus-populations
#18
J M Pujolar, A L Ferchaud, D Bekkevold, M M Hansen
This work investigated whether multiple freshwater populations of three-spined stickleback Gasterosteus aculeatus in different freshwater catchments in the Jutland Peninsula, Denmark, derived from the same marine populations show repeated adaptive responses. A total of 327 G. aculeatus collected at 13 sampling locations were screened for genetic variation using a combination of 70 genes putatively under selection and 26 neutral genes along with a marker linked to the ectodysplasin gene (eda), which is strongly correlated with plate armour morphs in the species...
May 17, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28508492/comparison-of-vertical-and-horizontal-swimming-behaviour-of-the-weather-loach-misgurnus-anguillicaudatus
#19
X Shi, S Zhao, C Ding, W Jiang, B Kynard, L Liu, S Niu, D Liu
Experiments on the swimming kinetics and behaviour of weather loach Misgurnus anguillicaudatus showed that horizontal swim speed was significantly greater than swim speeds when ascending to or descending from the water surface to gulp air. Vertical swimming speeds during ascending or descending were similar. Misgurnus anguillicaudatus swam unsteadily during vertical movements compared with horizontal movements.
May 15, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28488356/early-life-traits-of-farm-and-wild-atlantic-salmon-salmo-salar-and-first-generation-hybrids-in-the-south-coast-of-newfoundland
#20
D Hamoutene, J Perez-Casanova, K Burt, L Lush, J Caines, C Collier, R Hinks
This study examined fertilization rates, survival and early life-trait differences of pure farm, wild and first generation (F1) hybrid origin embryos after crossing farm and wild Atlantic salmon Salmo salar. Results show that despite a trend towards higher in vitro fertilization success for wild females, differences in fertilization success in river water are not significantly different among crosses. In a hatchery environment, wild females' progeny (pure wild and hybrids with wild maternal parent) hatched 7-11 days earlier than pure farm crosses and hybrids with farm maternal parents...
May 9, 2017: Journal of Fish Biology
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