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Journal of Fish Biology

K A Stiver, H K Kindsvater, N Tamburello, K L Heckman, J Klein, S H Alonzo
This paper describes how individual female ocellated wrasse Symphodus ocellatus distribute their spawning among males and nests in space and time. It is based on previously collected genetic data of larvae from ten different nests (used to reconstruct half and full-sibling groupings both within and among nests on multiple days) and behavioural data of marked females across the reproductive season. Both the genetic analyses and behavioural observations confirm that female S. ocellatus intentionally engage in multiple mating, by repeatedly spawning at the same nest on different days and at several different nests (up to 12 spawning events over 3 weeks), leading to mixed paternity among her young...
August 13, 2018: Journal of Fish Biology
Timothy D Mussen, J J Cech
The role of vision and the lateral-line system in fish-screen avoidance behaviours was investigated in shiner surfperch Cymatogaster aggregata and staghorn sculpin Leptocottus armatus. Avoidance experiments were conducted in front of water-diversion-type wedge-wire fish screens in a laboratory flume with a 0.3 m s-1 water velocity. Fish contacted the screens less frequently during the day than night, indicating that fish screen avoidance is visually mediated during the day. Input from the fishes' lateral-line systems was also blocked with streptomycin-sulphate treatments during the night to determine if these fishes use mechanoreceptive cues to guide screen avoidance in darkened conditions...
August 13, 2018: Journal of Fish Biology
S Schönhuth, R B Gagne, F Alda, D A Neely, R L Mayden, M J Blum
The extent and nature of genetic differentiation in Semotilus atromaculatus, one of the most abundant and widespread leuciscids in North America, were evaluated based on mitochondrial (mt) and nuclear DNA sequence variation. Phylogenetic relationships were first inferred based on a fragment of the cytochrome b (cytb) region and the nuclear intron s7 gene for S. atromaculatus and all other congeners as well as representative species from all other genera in the creek chub-plagopterin clade. The phylogeography of major haplogroups of S...
August 13, 2018: Journal of Fish Biology
H Ueda
Juvenile Oncorhynchus spp. Oncorhynchus spp. can memorise their natal stream during downstream migration; juveniles migrate to feed during their growth phase and then they migrate long distances from their feeding habitat to their natal stream to reproduce as adults. Two different sensory mechanisms, olfaction and navigation, are involved in the imprinting and homing processes during short-distance migration within the natal stream and long-distance migration in open water, respectively. Here, olfactory functions are reviewed from both neurophysiological studies on the olfactory discrimination ability of natal stream odours and neuroendocrinological studies on the hormonal controlling mechanisms of olfactory memory formation and retrieval in the brain...
August 12, 2018: Journal of Fish Biology
G Kalayci, R C Ozturk, E Capkin, I Altinok
We tested for reproductive isolation between Salmo trutta abanticus, S.t. labrax, S.t. caspius and S.t. fario by conducting crosses to produce F1 and F2 offspring. We also estimated the extent of genetic divergence between all three entities by examining sequence variation across the coI, d-loop and cytb mitochondrial genes. All of the F1 cross-types were successfully produced. After 2 years of culturing, F2 generation were produced as well. Fertilization, hatching and survival rates and hatching performance of F1 and F2 generations were evaluated...
August 12, 2018: Journal of Fish Biology
G Plaza, F Cerna, M F Landaeta, A Hernández, J E Contreras
Daily age and length patterns of anchoveta Engraulis ringens were analysed the sagittal otoliths from wild larvae (0-0.2 cm standard length, LS ), pre-recruits (3-6 cm total length, LT ), recruits (7-12 cm LT ) and young adults (12-15 cm LT ). Additionally, variability in growth and age at recruitment (AR ) were evaluated for recruits caught in northern Chile in 1973, 1982, 2009, 2010, 2012, 2013, 2014 and 2015. The age-length relationship showed four allometric patterns that were well described by Laird-Gompertz models...
August 2, 2018: Journal of Fish Biology
C S W Law, Y Sadovy de Mitcheson
Age and growth of the black seabream Acanthopagrus schlegelii (family Sparidae) from the northern South China Sea (NSCS) were studied by reading growth rings in sectioned sagittal otoliths. Ring formation frequency was determined to be annual by using marginal increment analysis. The von Bertalanffy growth function parameters were estimated as: L∞ = 43.7 cm LS ; K = 0.22 year-1 ; t0 = -1.59 years. Functional males are significantly younger than functional females, with sexually transitional individuals between the modal ages of males and females supporting protandry in this species...
August 2, 2018: Journal of Fish Biology
A M Wieczorek, A M Power, P Browne, C T Graham
This study examines the diet of lesser spotted dogfish Scyliorhinus canicula, one of the most ubiquitous predators of European coastal waters. This species is probably of major ecological significance as other large predatory fish decline as it has known interactions with fisheries. Scyliorhinus canicula diet was investigated in Irish coastal waters during June and July 2014 using both stomach-contents analysis and δ13 C and δ15 N stable-isotope ratios. Prey contribution to the diet from dual stable-isotope data was estimated using Bayesian mixing models...
August 1, 2018: Journal of Fish Biology
M Fenkes, H A Shiels, R L Nudds
Domesticated brown trout Salmo trutta parr were subjected to increased, variable flow under controlled experimental conditions. Using geometric morphometric analyses, K¯(a mass-length index) and caudal fin area-body length ratio, this study assessed morphological responses in lateral body depth, growth and robustness and propulsive potential, respectively, of parr over the course of 32 weeks. Geometric morphometric analyses did not reveal an effect of exercise on either lateral body depth or caudal fin area...
August 1, 2018: Journal of Fish Biology
K Morita, J Tsuboi, G Sahashi, T Kikko, D Ishizaki, D Kishi, S Endo, Y Koseki
The degree of iteroparity in stream-resident forms of masu salmon Oncorhynchus masou was examined using mark-recapture studies in natural streams. In a partially migratory population, at least 10% of resident males survived after maturation and repeatedly matured for up to 5 years. In the landlocked amago salmon subspecies, the post-maturation survival rate was at least 7% and repeat maturation was observed for up to 3 years for both males and females.
August 1, 2018: Journal of Fish Biology
G M W Stevens, J P Hawkins, C M Roberts
The aim of this 14 year study was to elucidate the entire courtship and mating behaviour of manta rays Mobula alfredi and M. birostris using behavioural observations, video and photographic records. From 2003 to 2016, over 11 000 surveys were undertaken at known manta ray aggregation sites in the Maldives to record any observed manta rays reproductive activity. From 47 591 photo-ID sightings, 4247 individual M. alfredi were identified and 226 individual M. birostris from 229 photo-ID sightings, all recorded at 22 atolls across 265 different sites...
July 31, 2018: Journal of Fish Biology
J Jesus, M C P Amorim, P J Fonseca, A Teixeira, S Natário, J Carrola, S Varandas, L Torres Pereira, R M V Cortes
This study focused on the use of sound playbacks as acoustic deterrents to direct native potamodromous migratory species away from all kind of traps. The effects of two acoustic treatments, a repeated sine sweep up to 2 kHz (sweep-up stimulus) and an intermittent 140 Hz tone, were tested in three fish species native to Iberia: Salmo trutta, Pseudochondrostoma duriense and Luciobarbus bocagei. In contrast with S. trutta, the endemic cyprinids P. duriense and L. bocagei exhibited a strong repulse reaction to the frequency sweep-up sound...
July 31, 2018: Journal of Fish Biology
K M D S A Castro, M P D Santos, M F G Brito, C J Bidau, P A Martinez
Geometric morphometrics were used to analyse ontogenetic trajectories in representatives of the Characiformes, Cichliformes, Cyprinodontiformes, Siluriformes, and Tetraodontiformes. It was not possible to differentiate any allometric growth patterns across groups, indicating that a phylogenetically conserved developmental pattern is widespread throughout Teleostei. This article is protected by copyright. All rights reserved.
July 31, 2018: Journal of Fish Biology
F Concha, N Morales, S Hernández
Twelve egg capsules laid in captivity by three females of Zearaja chilensis were incubated in the laboratory. After 252 ± 9.4 days, 10 skates successfully hatched, with a mean total length, disc length, and disc width of 17.2, 7.4, and 11.4 cm, respectively. This is the first report of captive hatching of Z. chilensis and its corresponding incubation period. This article is protected by copyright. All rights reserved.
July 31, 2018: Journal of Fish Biology
R Bañón, A Alonso-Fernández, D Barros-García, M B Rios, A de Carlos
The first record of the prickly puffer Ephippion guttifer (Tetraodontidae) from Galician waters (north-west Spain) is reported based on a male specimen of 570 mm total length (LT ) caught in the Ría de Vigo. Morphometric, meristic and DNA barcode data confirmed the identification. Histological examination of reproductive tissue was carried out in this species for the first time, showing a mature male in an actively spawning phase. A historical revision invalidates a previous record and establishes this as the northernmost confirmed capture ever reported in the north-eastern Atlantic Ocean...
July 26, 2018: Journal of Fish Biology
S D Ross, J R Nielsen, H Gislason, A Nielsen, N G Andersen
In the western Baltic Sea (WBS), whiting Merlangius merlangus is the main piscivorous fish together with cod Gadus morhua. In the present study, we investigate the growth and food consumption rates of WBS M. merlangus and compare the growth rates of males and females with those of M. merlangus in the North Sea (NS). Food consumption rates are estimated directly from sampled stomach contents in the WBS using a gastric evacuation rate model and indirectly by using a static energy-budget model together with the growth rates...
July 26, 2018: Journal of Fish Biology
A Richu, N Dahanukar, A Ali, K Ranjeet, R Raghavan
A demographic study on Epinephelus bleekeri based on a sample of 1003 individuals caught in commercial fisheries along the Arabian Sea coast of southern India considerably extends the maximum recorded standard length for this species to 870mm, indicates a high natural mortality rate and an exploitation level (E) greater than the Emax . This article is protected by copyright. All rights reserved.
July 26, 2018: Journal of Fish Biology
K E Self, C B Schreck, K M Cogliati, E J Billman, D L G Noakes
The effects of egg size on early development and growth of steelhead Oncorhynchus mykiss were recorded for more than 200 days following hatching. Fish from smaller eggs hatched sooner and at a smaller size than fish from larger eggs, but fish from smaller eggs showed consistently higher growth rates than fish from larger eggs. Since many life-history attributes appear to be determined by size or growth rate at age during the first year, egg size could be a significant predictor of important changes in the life history of individuals...
July 26, 2018: Journal of Fish Biology
J E T Strand, D Hazlerigg, E H Jørgensen
The present study investigated whether there is a critical length of photoperiod needed to stimulate a completed parr-smolt transformation (PST) in Atlantic salmon Salmo salar. In two experiments, S. salar parr of the Norwegian aquaculture strain held on continuous light were exposed to a short photoperiod (6L:18D) followed by exposure to 8L:16D, 12L:12D, 16L:8D, 20L:4D and 24L:0D in experiment 1 or to 6L:18D followed by maintenance 6L:18D or exposure to 12L:12D and 24L:0D photoperiods in experiment 2. All groups, irrespective of photoperiod treatment, developed improved hypo-osmoregulatory ability...
July 26, 2018: Journal of Fish Biology
M Jokela-Määttä, M Viljanen, N Nevala, K Donner, C Brönmark
The photoreceptors and eyes of four fish species commonly cohabiting Fennoscandian lakes with different light transmission properties were compared: pikeperch Sander lucioperca, pike Esox lucius, perch Perca fluviatilis and roach Rutilus rutilus. Each species was represented by individuals from a clear (greenish) and a humic (dark brown) lake in southern Finland: Lake Vesijärvi (LV; peak transmission around 570 nm) and Lake Tuusulanjärvi (LT; peak transmission around 630 nm). In the autumn, all species had almost purely A2-based visual pigments...
July 26, 2018: Journal of Fish Biology
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