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Journal of Fish Biology

T A Delomas, K Dabrowski
Gynogenetic zebrafish Danio rerio were obtained by activating D. rerio oocytes with UV irradiated common carp Cyprinus carpio sperm and then applying one of four different shocks [two (early) meiotic and two (late) mitotic shocks]. Gynogens produced by three of the shocks survived to maturity. All adult gynogens (n = 52) except one were found to be male. There was no difference in growth rate between the biparental controls and gynogens produced through the most effective shock, thereby eliminating growth rate as a possible cause of the skewed sex ratio...
October 14, 2018: Journal of Fish Biology
E Morrissey-Mccaffrey, S Shephard, F L Kelly, M Kelly-Quinn
This study finds that non-native species and warming temperatures have significant negative effects on Arctic char Salvelinus alpinus abundance in Irish lakes. Eutrophication was not important at the range of total phosphorus tested (0.005-0.023 mg l-1 ). Model results predict that S. alpinus occur across the temperature range sampled (8.2-19.7°C) when non-natives are absent, but S. alpinus catch is predicted to be close to zero irrespective of temperature when non-native catch is high. This result indicates that to persist S...
October 12, 2018: Journal of Fish Biology
B Anderson, C Belcher, J Slack, J Gelsleichter
This study examined the usefulness of portable ultrasonography in accurately predicting pregnancy and fecundity in the bonnethead shark Sphyrna tiburo by comparing ultrasound-obtained data with those obtained from animal dissection, the gold standard for elasmobranch reproduction studies. Mature female S. tiburo (n = 66) were collected throughout the period of reproduction and examined via portable ultrasonography using two different ultrasound transducers (8-5 MHz linear array transducer and a 5.0-2.5 MHz curvilinear array transducer) to determine pregnancy status and fecundity...
October 10, 2018: Journal of Fish Biology
E Neumann, M C F Paes, J M R Mendes, F M S Braga, L S O Nakaghi
No abstract text is available yet for this article.
October 10, 2018: Journal of Fish Biology
S B Barreto, A T Silva, H Batalha-Filho, P R A M Affonso, A M Zanata
An integrative approach based on morphological and multilocus genetic data was used to describe a new species of Nematocharax from the headwaters of the upper Contas River on the Diamantina Plateau, north-eastern Brazil and to infer the relationships among evolutionary lineages within this fish genus. Multispecies coalescent inference using three mitochondrial and five nuclear loci strongly supports a basal split between Nematocharax venustus and the new species, whose distinctive morphological characters include absence of filamentous rays on pelvic fins of maturing and mature males, reduced anal-fin lobe length and lower body depth...
October 10, 2018: Journal of Fish Biology
C Rallière, A Branthonne, P Y Rescan
The formation of the intramuscular connective tissue was investigated in rainbow trout Oncorhynchus mykiss by combining histological and in situ gene-expression analysis. Laminin, a primary component of basement membranes, surrounded superficial slow and deep fast muscle fibres in O. mykiss as soon as the hatching stage (c. 30 days post fertilization (dpf)). In contrast, type I collagen, the primary fibrillar collagen in muscle of vertebrates, appeared at the surface of individual slow and fast muscle fibres only at c...
October 10, 2018: Journal of Fish Biology
K G Shink, T M Sutton, J M Murphy, J A López
The absence of information on genetic variation and population structure of brook lampreys Lethenteron spp. in the eastern part of their distribution limits our understanding of the migration ecology and spatial population genetic structure of the species. We examined genetic variation within and among three aggregations of Lethenteron spp. larvae in the Yukon River drainage, Alaska, using microsatellite genotypes. A total of 120 larval lampreys were genotyped at eight microsatellite loci. Global FST was 0...
October 10, 2018: Journal of Fish Biology
S A Mendonça, B C L Macena, A S Afonso, F H V Hazin
The present study aimed to analyse occurrence patterns, relative abundance and habitat use by the sicklefin devil ray Mobula tarapacana in the Saint Peter and Saint Paul Archipelago (SPSPA), Brazil, located in the Mid-Atlantic Ridge. Sampling was conducted between December 2008 and December 2012 by surface surveys and tagging with conventional tags and acoustic transmitters. Mobula tarapacana were sighted in the SPSPA year round but the highest frequency of occurrence was observed from January to June, probably due to greater food availability during this season...
October 3, 2018: Journal of Fish Biology
L B He, L Xiong, A D Zhang, Y M Li, R Huang, L J Liao, Z Y Zhu, Y P Wang
In this study, a full-sib population of Ctenopharyngodon idella was constructed and approximately 500 C. idella individuals were sampled at four early developmental stages (hatching, first feeding, juvenile fish and young fish). Four DNA pools were constructed and subjected to next-generation sequencing. On the basis of the identification of single nucleotide polymorphisms (SNP), changes in gene and genotype frequencies during the developmental progress of C. idella were revealed, which indicates that death during the early developmental stage is not a random process...
October 3, 2018: Journal of Fish Biology
S Vincenzi, D Jesensek, J C Garza, A J Crivelli
The hypothesis that the effects of heterozygosity vary with environmental conditions was tested using six populations of marble trout Salmo marmoratus from western Slovenia as a model system. The hypotheses tested were: stronger effects of heterozygosity on survival in populations characterized by low average survival; no effects of heterozygosity on probability of surviving flash floods owing to their largely non-selective effects across traits; stronger effects of heterozygosity on survival for fish born after floods than fish born before...
October 3, 2018: Journal of Fish Biology
N Guillerault, G Loot, S Blanchet, F Santoul
Genetic introgression from stocked adult northern pike Esox lucius to a wild self-recruiting population was detected in a large river system and some stocked E. lucius survived up to two spawning seasons and dispersed over several kilometres in the river. Moreover, the catch rate of stocked E. lucius by anglers was low (9.6%), hence suggesting that the efficiency of stocking activity is questionable.
October 3, 2018: Journal of Fish Biology
J L Horreo, A Griffiths, G Machado-Schiaffino, J Stevens, E Garcia-Vazquez
In this work, patterns of geographical genetic diversity in Atlantic salmon Salmo salar were studied across the whole Atlantic arc, as well as whether patterns (and thus genetic population structure) were affected by water temperatures. Salmo salar populations were here characterized using microsatellite loci and then analysed in the light of ocean surface temperature data from across the region. Analysis showed the presence of a latitudinal cline of genetic variability (higher in northern areas) and water temperatures (sea surface temperatures) determining genetic population structure (the latter in combination with genetic drift in southern populations)...
October 3, 2018: Journal of Fish Biology
J P Losee, A M Claiborne, P D Dionne, H S Faulkner, T R Seamons
Pacific salmon Oncorhynchus spp. have been the focus of scientific research for over a century, but anadromous trout in this genus, in particular anadromous coastal cutthroat trout Oncorhynchus clarkii clarkii, have been neglected. Oncorhynchus clarkii clarkii occupy a diverse range of habitats including fresh water, brackish estuaries and marine water, but have a relatively small home range making them ideal for studies of behaviour and movements during ocean residency. In 2015, we sampled O. c. clarkii monthly along a small stretch of beach (47...
September 30, 2018: Journal of Fish Biology
J L Sherwood, A J Stites, M J Dreslik, J S Tiemann
Understanding a species' historical and current distribution is critical when making conservation and management decisions. Recent observations in headwater streams of northern Illinois, USA, where no previous records of Iowa Darters Etheostoma exile occurred, revealed the need to re-evaluate its state-wide distribution. We conducted a series of species distribution modelling procedures coupled with targeted field surveys to generate historical and contemporary distribution models. The historical distribution model indicated E...
September 29, 2018: Journal of Fish Biology
Jolle W Jolles
Sociality is an omnipresent feature in the animal kingdom, ranging from loose aggregations of animals and fission-fusion systems to highly stable groups of related individuals. While much work on the topic has focused on understanding the emergence of group-level properties, relatively little is known about the variability among groups and about collective dynamics and structure at the community level.
September 29, 2018: Journal of Fish Biology
J E Abecia, O J Luiz, A J King
Intraspecific variability, although comparably less studied than interspecific variation, is an important tool in understanding population responses to environmental gradients. This study investigated intraspecific trait variation across three contrasting aquatic flow habitat types (intermittent creek, billabong and river) in a common mouth-brooding freshwater fish in northern Australia, the mouth almighty Glossamia aprion. Samples of G. aprion were collected at various sites, within the Daly River catchment...
September 29, 2018: Journal of Fish Biology
T Colaço-Fernandes, S Amadio
This study records the occurrence of a hermaphrodite individual of the apapá Pellona flavipinnis captured in a floodplain area of the Amazon River. Histology of the left gonad revealed the presence of testicular germ cells (spermatocytes and spermatozoa) in the cranial portion and mature ovarian cells (primary and vitellogenic oocytes) in the caudal portion, separated by connective tissue. This is the first record of a hermaphrodite fish of the family Pristigasteridae, order Clupeiformes.
September 29, 2018: Journal of Fish Biology
Katie A Gaffney, Mike M Webster
In a paper this year (Gaffney and Webster 2018) we presented a series of experiments in which we investigated the effects of arena size and inter-observation duration upon basic social network structure metrics and related measures for shoals of threespine sticklebacks Gasterosteus aculeatus L. 1758.
September 29, 2018: Journal of Fish Biology
A Burcea, G-O Popa, I E Florescu Gune, S Gharbia, G Gaina, A Dudu, M Maereanu, A Hermenean, S E Georgescu, M Costache
The scope of this study is to investigate the expression of dmrt1, foxl2, ar, star and sox9 genes in the context of the gonad development stage of 21 month-old Best Beluga individuals. No significant difference was observed between males and females but the cyp17a1 gene showed higher expression in male than in female gonads. The results suggest that during sampling the females were in perinucleolar stage and the males in early spermatogenesis stage which led to specific patterns of expression for the investigated genes...
September 28, 2018: Journal of Fish Biology
Q B Qin, Q W Liu, Y W Zhou, C Q Wang, H Qin, C Zhao, S J Liu
Autotetraploid fish (4n = 200, abbreviated as 4nRR), which reach sexual maturity at 1 year of age, were derived from the whole genome duplication of red crucian carp Carassius auratus (RCC; 2n = 100) and possess four sets of chromosomes from RCC. The histological features of the gonads showed that the RCC and 4nRR both possessed normal gonadal structure and could arrive at maturation. To understand the expression characteristics of genes related to reproductive development in the autotetraploid fish, we analysed the nucleotide sequence and expression characteristics of the gnrh2, gthb and gthr genes, which are the pivotal genes of the hypothalamic-pituitary-gonadal (HPG) axis...
September 27, 2018: Journal of Fish Biology
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