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Journal of Fish Biology

T P Barry, G K Dehnert, P D Hoppe, P W Sorensen
Water-soluble factors associated with walleye Sander vitreus predation on either yellow perch Perca flavescens or fathead minnows Pimephales promelas markedly increased the growth rate of P. flavescens. The findings suggest that P. flavescens possess an inducible growth-promoting mechanism regulated by water-born chemicals. It may be possible to increase the growth rate of farm-raised P. flavescens by manipulating this system.
October 17, 2017: Journal of Fish Biology
R J Nevatte, B E Wueringer, D E Jacob, J M Park, J E Williamson
Potential roles of the rostrum of sawsharks (Pristiophoridae), including predation and self-defence, were assessed through a variety of inferential methods. Comparison of microwear on the surface of the rostral teeth of sawsharks and sawfishes (Pristidae) show that microwear patterns are alike and suggest that the elongate rostra in these two elasmobranch families are used for a similar purpose (predation). Raman spectroscopy indicates that the rostral teeth of both sawsharks and sawfishes are composed of hydroxyapatite, but differ in their collagen content...
October 16, 2017: Journal of Fish Biology
K V Akhilesh, G B Purushottama, Thakurdas, S J Kizhakudan
Biological information was collected from 214 individuals of the broadfin shark Lamiopsis temminckii measuring 418 to 1782 mm total length, LT . Size at maturity (L50 ) for females and males was estimated at 1430 and 1368 mm LT , respectively, while mature and gravid females were observed from 1350 mm LT with litter sizes 2-8 and size at birth 418-650 mm LT . Analysis of stomach contents revealed a variety of prey, primarily crustaceans (54·0%), teleosts (42·7%) and cephalopods.
October 16, 2017: Journal of Fish Biology
C Musseau, S Vincenzi, D Jesenšek, A J Crivelli
Introduced and allopatric populations of brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss were sampled in Slovenia for stable isotope analysis to assess dietary niche shifts through ontogeny and estimate the propensity for cannibalism. Both S. trutta and O. mykiss are cannibals, with higher average relative contribution of conspecific assimilated energy for S. trutta (27·9%) compared with O. mykiss (7·7%). The smallest cannibal was 166 mm in the S. trutta population and 247 mm in the O. mykiss population...
October 12, 2017: Journal of Fish Biology
G D Raby, T B Johnson, S T Kessel, T J Stewart, A T Fisk
In the present study, pop-off data storage tags (pDST) without any transmitting capabilities were attached to 118 adult salmonids in a 19 000 km(2) freshwater system (Lake Ontario). The 9·3 cm long cylindrical tags were externally attached to fishes using a backpack-style harness, set to record pressure (dBar ≈ depth in m) and temperature every 70 s (and at some key times, every 5 s) and programmed to release from the harness and float to the surface after c. 1 year. Recapture of the bright-orange tags for data retrieval relied on members of the public finding tags on shore, or on anglers capturing fishes with tags attached and using the contact information displayed on each tag to mail tags to the research team in exchange for a monetary reward...
October 12, 2017: Journal of Fish Biology
B M Norman, J M Whitty, S J Beatty, S D Reynolds, D L Morgan
Whale sharks Rhincodon typus were monitored via acoustic transmitters at the northern end of Western Australia's Ningaloo Marine Park to establish the extent to which the species inhabits the region beyond the whale-shark ecotourism industry season, which usually extends from March to August in each year. Despite the vast majority (c. 98%) of photographic submissions of R. typus from Ningaloo Reef being between March and August, acoustic detections from the tagged R. typus at Ningaloo were recorded in all months of the year, but do not preclude the occurrence of extended absences...
October 10, 2017: Journal of Fish Biology
J P Lewis, W F Patterson, J K Carlson
Key methodological assumptions regarding the degree of natural variability and influence of sample handling and storage of elasmobranch vertebral chemistry were assessed using laser-ablation inductively coupled plasma mass spectrometry. Vertebral chemistry of juvenile blacktip sharks Carcharhinus limbatus was examined to identify whether differences existed among different regions of the vertebral column, between thoracic vertebrae of individual fish or within individual vertebrae. Additionally, the effects of bleach exposure and storage in ethanol on vertebral chemistry were compared...
October 10, 2017: Journal of Fish Biology
M S Castro, A C T Bonecker
The composition of the larval fish assemblage in the sound-scattering layer of the continental shelf waters off the coast of south-eastern Brazil (12 and 22° S), a research project that is part of the Brazilian programme Avaliação do Potencial Sustentável de Recursos Vivos na Zona Econômica Exclusiva (REVIZEE), is described. Samples were collected during daylight hours and at dusk at five oceanographic stations in the winter of 1999 using an Isaacs-Kidd Midwater Trawl (IKMT). The oceanographic stations were chosen based on the detection of plankton layers by acoustic observation...
October 10, 2017: Journal of Fish Biology
K I Flowers, A C Henderson, J L Lupton, D D Chapman
Photographic identification was used to track the movements of the whitespotted eagle ray Aetobatus narinari around South Caicos, Turks and Caicos Islands. A total of 165 individuals were identified, aided by the computer program I(3) S Spot. The sex ratio across all study sites in 2015 was not significantly different from 1:1 (χ(2)  = 2·8, P > 0·05). 33·9% of all individual rays were resighted at least once and the maximum number of days between the first and last sighting was 1640 (median 165, interquartile range, IQR = 698)...
October 9, 2017: Journal of Fish Biology
K Hench, W O Mcmillan, R Betancur-R, O Puebla
Transect surveys of hamlet communities (Hypoplectrus spp., Serranidae) covering 14 000 m(2) across 16 reefs off La Parguera, Puerto Rico, are presented and compared with a previous survey conducted in the year 2000. The hamlet community has noticeably changed over 17 years, with a > 30% increase in relative abundance of the yellowtail hamlet Hypoplectrus chlorurus on the inner reefs at the expense of the other hamlet species. The data also suggest that the density of H. chlorurus has declined and that its distribution has shifted towards shallower depths...
October 9, 2017: Journal of Fish Biology
S Chow, H Kurogi, T Yamamoto, T Tomoda, N Mochioka, F Shirotori, T Yoshinaga, D Ambe, M Okazaki, S Nagai, T Yanagimoto
Species-specific restriction fragment length polymorphism in the intron of the androgen receptor gene (ar5) was found in glass to silver-stage individuals of Anguilla japonica (n = 51) and A. marmorata (n = 21). The sequence analysis of 16S rDNA from 328 anguillid leptocephali collected in the North Equatorial Current of the western North Pacific Ocean revealed the specimens to be A. japonica (n = 194), A. marmorata (n = 128), A. bicolor pacifica (n = 5) and A. luzonensis (n = 1). All leptocephali of A. japonica and A...
October 9, 2017: Journal of Fish Biology
S Kitada, K Nakajima, K Hamasaki
Population structure and demographic history of the Japanese Spanish mackerel Scomberomorus niphonius a highly piscivorous and migratory marine fish, were assessed using mitochondrial DNA control region sequences (n = 720) and microsatellite genotypes at five loci (n = 1331) for samples collected on Japanese coasts from 2001 to 2010. The population structure was panmictic and the haplotype and allele frequencies were temporally stable even during the recent recovery process. Demographic expansion was strongly supported throughout the Pleistocene, suggesting that the oscillating glacial and interglacial climate conditions in the Pleistocene had no substantial impact on the demographic history of S...
October 9, 2017: Journal of Fish Biology
T Rodgers
No abstract text is available yet for this article.
October 9, 2017: Journal of Fish Biology
M Lteif, R Mouawad, G Khalaf, P Lenfant, B Seret, M Verdoit-Jarraya
A total of 38 individuals of the heavily exploited little gulper shark Centrophorus uyato were collected from Lebanese coastal waters using bottom longlines and trammel nets of different meshes at depths ranging from 115 to 600 m between May 2013 and February 2014. Their total lengths were between 45 and 94 cm and their total mass was from 870 to 6700 g. The sex ratio was not significantly different from 1:1, with 20 males and 18 females, but bathymetric sexual segregation occurred. Catch per net setting (CNS) was used as a relative abundance index to detect spatial distribution; trammel nets showed largest CNS ranging from 4·9 to 5·45 kg per unit effort in the north and south, at depths from 120 to 200 m, during spring and summer...
October 4, 2017: Journal of Fish Biology
H Ojaveer, R Gross, K Laur, T Arula, R Klais
Using molecular tools to examine Gobiidae, the second most abundant taxon in ichthyoplankton samples in the Gulf of Riga (Baltic Sea), the sand goby Pomatoschistus minutus was the most abundant taxon (82% of all individuals analysed), the common goby Pomatoschistus microps constituted 12% and the black goby Gobius niger 6%. The spatiotemporal distribution of P. microps and G. niger indicated a preference for habitats closer to the river inlet and their abundances increased slightly towards the end of the sampling period in summer...
September 25, 2017: Journal of Fish Biology
K Rhodes, D Hernandez-Ortiz, M Ioanis, W Washington, S Maxim, K Olpet, S Malakai
Between February 2015 and 2016, samples of the Indo-Pacific goldspotted spinefoot Siganus punctatus were taken from local fish markets, feeding sites and nursery grounds on the main island of Pohnpei, Micronesia, to ascertain sexual pattern, reproductive seasonality, age, growth and mortality. Microscopic examinations of gonads identified two seasonal peaks in reproduction: February to May and September to December, with evidence of some spawning activity in most months. Ripe females were observed 4 days on either side of the new moon...
September 25, 2017: Journal of Fish Biology
K D Steffensen, L A Powell, M A Pegg
Several population viability models were constructed to aid recovery in endangered Scaphirhynchus albus, but these models are dependent upon accurate and precise input parameters that are not provided with standard catch per unit effort (CPUE) indices. Nine years of sampling efforts, under the robust design framework, provided 1223 unique captures with an 18·3% recapture rate. The annual population estimates varied from 4·0-7·3 fish rkm(-1) for wild and 8·4-18·4 fish rkm(-1) for hatchery-reared S...
September 18, 2017: Journal of Fish Biology
V Bernal-Durán, N Jahnsen-Guzmán, M F Landaeta
Larval body shape changes and developmental timing were examined in two clingfish species from the south-east Pacific Ocean, Gobiesox marmoratus and Sicyases sanguineus. Ontogenetic allometry showed no interspecific variation and <7 mm standard length (LS ) larvae of both species occupied similar morphospace, but larger G. marmoratus showed increased body depth while larvae of S. sanguineus developed a flattened head and maintained a hydrodynamic body. Estimated developmental timing suggests that larval body shape changes were faster in G...
September 18, 2017: Journal of Fish Biology
S H Eldøy, J G Davidsen, E B Thorstad, F G Whoriskey, K Aarestrup, T F Naesje, L Rønning, A D Sjursen, A H Rikardsen, J V Arnekleiv
The vertical behaviour of 44 veteran sea trout Salmo trutta (275-580 mm) in different marine fjord habitats (estuary, pelagic, near shore with and without steep cliffs) was documented during May-February by acoustic telemetry. The swimming depth of S. trutta was influenced by habitat, time of day (day v. night), season, seawater temperature and the body length at the time of tagging. Mean swimming depth during May-September was 1·7 m (individual means ranged from 0·4 to 6·4 m). Hence, S. trutta were generally surface oriented, but performed dives down to 24 m...
September 15, 2017: Journal of Fish Biology
N P Thuong, B Verstraeten, B D Kegel, J Christiaens, T D Wolf, P Sorgeloos, D Bonte, D Adriaens
The aim of this study was to characterize histological changes during opercular osteogenesis in farmed gilthead sea bream Sparus aurata larvae from 7 to 69 days post hatching (dph) and compare normal osteogenesis with that of deformed opercles. Mild opercular deformities were first detected in 19 dph larvae by folding of the opercle's distal edge into the gill chamber. Here, the variation in the phenotype and the irregular bone structure at the curled part of the opercles is described and compared with the histology of normal opercles...
September 15, 2017: Journal of Fish Biology
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