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Journal of Fish Biology

J V Arnekleiv, J G Davidsen, T F Sheehan, S J Lehnert, I R Bradbury, L Rønning, A D Sjursen, G Kjӕrstad, B A Lubinski, K J Nilssen
A survey of the Kapisillit River system was conducted in 2005 and 2012 to study the only indigenous Atlantic salmon Salmo salar population in Greenland. Little is known about its characteristics or its relationship with other S. salar populations across the species range. Juvenile S. salar were captured in all stations surveyed within the lower river with the highest densities lower in the river and decreasing densities with increasing distance from the river mouth. Captured juveniles ranged from 0+ to 7+ years old and the predominant smolt age was between 4-6 years...
December 15, 2018: Journal of Fish Biology
Junho Eom, Chris M Wood
We made anatomical and physiological observations of the breathing mechanisms in Pacific hagfish Eptatretus stoutii, with measurements of nostril flow and pressure, mouth and pharyngo-cutaneous duct (PCD) pressure and velum and heart impedance and observations of dye flow patterns. Resting animals frequently exhibit spontaneous apnea. During normal breathing, water flow is continuous at a high rate (~125 ml kg-1 min-1 at 12°C) powered by a two-phase unidirectional pumping system with a fast suction pump (the velum, ~ 22 min-1 ) for inhalation through the single nostril and a much slower force pump (gill pouches and PCD ~ 4...
December 13, 2018: Journal of Fish Biology
Wei Song, Lingzhi Li, Hongliang Huang, Keji Jiang, Fengying Zhang, Luming Wang, Ming Zhao, Lingbo Ma
Here, we explored the liver, heart and muscle tissue transcriptome of the haemoglobinless Antarctic fish Chionodraco hamatus using the Illumina paired-end RNA sequencing. A total of 114,028 unigenes with a mean length of 794.24 bp was produced. Annotation of these unigenes showed that 29.16% and 35.52% of them had hits in the nucleotide (Nt) and protein (Nr) databases, respectively. In addition, 29.10% and 35.28% unigenes were annotated in the SwissProt and TrEMBL databases while 23.27% and 21.08% of unigenes were annotated in the conserved domain (CCD) and protein family (PFAM) databases, respectively...
December 13, 2018: Journal of Fish Biology
M C Almeida, H J Message, P V Sanches, D Baumgartner, R A Bombardelli, G Baumgartner, F Langeani
This study investigated the morphology, morphometric and meristic characters of 117 larval Pimelodus britskii showing early development of head, eye, barbel and snout. Body and mouth pigmentation increased throughout development; the mouth was ventrally situated in the yolk-sac stage, becoming subterminal afterwards, and an embryonic fin was visible in all four stages observed. Post-flexion larval P. bristskii are distinguished from larval P. ortmanni by having 47-50 myomeres (v. 36).
December 11, 2018: Journal of Fish Biology
Julian Döring, Carola Wagner, Maik Tiedemann, Patrice Brehmer, Werner Ekau
The gross energy content of spawning batches and the microchemistry of sagittal otoliths in individual female bonga shad Ethmalosa fimbriata were compared between contrasting sampling sites at the Senegalese south coast and inside the hypersaline Sine Saloum Estuary. Results show that females spawning in the estuary's middle reaches invested almost three times more energy into reproduction (115 ± 65 J g-1 body mass) than their neritic counterparts (39 ± 34 J g-1 body mass). Also, female otolith levels of Ba:Ca, Sr:Ca and Zn:Ca either differed significantly between study sites or could be linked to heterogeneous environmental variables...
December 11, 2018: Journal of Fish Biology
J M Maxfield, K S Cole
This study documents changes in gonadal structure for the serial hermaphrodite (or bidirectional sex changer) divine dwarfgoby Eviota epiphanes (family Gobiidae) as individuals transition in both directions. To evaluate transitional gonad morphology, individuals actively producing the same gamete type (oocytes or sperm) were set up into pairs and euthanised over a period of 14 days to get a time series of morphological changes during gonad transformation. Results from this study show that rapid changes in the gonad take place at a structural level as individuals change their reproductive function and gamete production...
December 7, 2018: Journal of Fish Biology
Brooke J Vetter, Loranzie S Rogers, Allen F Mensinger
Non-physical barriers, including the use of underwater strobe lights alone or paired with sound or bubbles, are being considered as a means to prevent the upstream migration of invasive silver carp Hypophthalmichthys molitrix and bighead carp H. nobilis. To optimize potential optical deterrents, it is necessary to understand the visual sensitivity of the fishes. Dark-adapted H. molitrix and H. nobilis were found to possess broad visual sensitivity between 470 nm to 620 nm with peak spectral sensitivity at 540 nm for H...
December 7, 2018: Journal of Fish Biology
P Hedberg, F Tomband, M Gullström, N S Jiddawi, M Winder
Fish larvae abundances, diversity and trophic position across shallow seagrass, coral reef and open water habitats were examined to characterize their distribution in coastal East Africa. Larvae were identified to family and analysed for abundance differences between sites and habitats, trophic level using stable-isotope analysis and parental spawning mode. Abundances differed greatly between sites with the highest numbers of larvae occurring in the open-water habitats. Larval fish diversity was high across habitats with 51 families identified with small differences between sites and habitats...
December 4, 2018: Journal of Fish Biology
C L Nieman, S M Gray
The objectives of this study were to determine the effects of different forms of elevated turbidity on the visual acuity of two native Lake Erie fishes and to assess the response of fishes from different trophic levels to elevated turbidity. Additionally, the role of visual morphology (e.g., eye and optic lobe size) on visual acuity was evaluated across visual environments. Reaction distance, a behavioural proxy for measures of visual acuity, was measured for a top predator, walleye Sander vitreus and a forage fish, emerald shiner Notropis atherinoides...
December 3, 2018: Journal of Fish Biology
A Sun, H Zhu, Y Dong, W Wang, H X Hu
In this study, a cell line, designated as ART, was successfully established from testis tissues of the sterlet Acipenser ruthenus and characterized by studying and comparing the expression of specific genes between the cell line and the parent gonad tissues. The results suggested that the developed ART cell line was composed of a mixture of germ cells and somatic cells. Ploidy analysis indicated that the cell line exhibited a high degree of genetic stability and that the cells remained in a good proliferating state after being subcultured to passage 80...
November 28, 2018: Journal of Fish Biology
Liangming Chen, Rong Huang, Denghui Zhu, Cheng Yang, Libo He, Yongming Li, Lanjie Liao, Zuoyan Zhu, Yaping Wang
This research identified 169 known microRNAs (mirNA) mirNAs, 380 novel mirNAs, and 30,538 targets in 11 tissues (blood, brain, derma, gill, heart, intestine, kidney, liver, muscle, pronephros, and spleen) from grass carp Ctenopharyngodon idella with high-throughput sequencing (HTS). Transcripts per million (TPM) expression analysis detected 41 brain-enriched mirNAs (accounting for 61.19% of all tissue-enriched mirNAs). Real-time quantitative PCR (rt-qPCR) confirmed that 21 of 24 randomly selected tissue-enriched mirNAs from the TPM analysis were indeed tissue-enriched (P < 0...
November 24, 2018: Journal of Fish Biology
Alifa Bintha Haque, Sudipta Arka Das
In a study identifying the species composition of illegally traded elasmobranch products, evidence was collected of the presence of green sawfish Pristis zijsron in Bangladeshi waters of the Bay of Bengal. This is the first confirmed record of Pristis zijsron from this region, extending its known range >1000 km to the north-west. This is an important record in a region where sawfish have declined significantly and are now rarely sighted; it highlights the urgency of further regional species-specific studies within the Indian Ocean...
November 23, 2018: Journal of Fish Biology
Faye Moyes, Anne E Magurran
Marine fish are an irreplaceable resource, but are currently under threat through overfishing and climate change. To date, most of the emphasis has been on single stocks or populations of economic importance. However, commercially valuable species are embedded in assemblages of many species and there is only limited understanding of the extent to which the structure of whole communities has altered in recent years. Most assemblages are dominated by one or a few species, with these highly abundant species underpinning ecosystem services and harvesting decisions...
November 17, 2018: Journal of Fish Biology
J Reizenberg, L E Bloy, O L F Weyl, J M Shelton, H F Dallas
The Cape Fold Ecoregion (CFE) is a biodiversity hotspot with high levels of endemism in its freshwater fish fauna. This study examined inter and intra-specific variation in critical thermal maxima (TCmax ) for eight native species of freshwater fish from the CFE. Cape galaxias Galaxias zebratus, Breede River redfin Pseudobarbus burchelli, Berg River redfin Pseudobarbus burgi, Clanwilliam redfin Pseudobarbus calidus and fiery redfin Pseudobarbus phlegethon were the most thermally sensitive (TCmax = 29.8-32.8°C)...
November 17, 2018: Journal of Fish Biology
R L Putland, J C Montgomery, C A Radford
Underwater sound is directional and can convey important information about the surrounding environment or the animal emitting the sound. Therefore, sound is a major sensory channel for fishes and plays a key role in many life-history strategies. The effect of anthropogenic noise on aquatic life, which may be causing homogenisation or fragmentation of biologically important signals underwater is of growing concern. In this review we discuss the role sound plays in the ecology of fishes, basic anatomical and physiological adaptations for sound reception and production, the effects of anthropogenic noise and how fishes may be coping to changes in their environment, to put the ecology of fish hearing into the context of the modern underwater soundscape...
November 17, 2018: Journal of Fish Biology
C J Lee, G C Paull, C R Tyler
Environmental enrichment involves increasing the complexity of a fish's environment in order to improve welfare. Researchers are legally obliged to consider the welfare of laboratory animals and poor welfare may result in less robust data in experimental science. Laboratory zebrafish Danio rerio are usually kept in bare aquaria for ease of husbandry and, despite being a well-studied species, little is known about how laboratory housing affects their welfare. This study shows that environmental enrichment, in the form of the addition of gravel substratum and plants into the tank, affects survivorship, growth and behaviour in laboratory-maintained D...
November 15, 2018: Journal of Fish Biology
N N Hanson, G W Smith, S J Middlemas, C D Todd
Using tagged and recaptured Atlantic salmon Salmo salar (n = 106) the present analysis shows that the most commonly applied linear back-calculation method for estimating past length, the Dahl-Lea method, resulted in overestimation of the length of large smolts and underestimation of small smolts. A correction equation (y = 0.53x + 6.23) for estimating true smolt length (y) from lengths back-calculated from adult scale measures (x) to account for these systematic discrepancies is proposed.
November 15, 2018: Journal of Fish Biology
C S Austin, T E Essington, T P Quinn
Median bull trout Salvelinus confluentus breeding was 2 weeks earlier in a cool stream than in a proximate warmer stream, aligning with expectations for salmonids, followed by emergence timing calculated to be six weeks later in the cool stream than the warm stream. This pattern is consistent with both site-specific adaptation and thermal spawning threshold hypotheses for life-history event timing in this threatened species.
November 15, 2018: Journal of Fish Biology
J C Mangel, M Pajuelo, A Pasara-Polack, G Vela, E Segura-Cobeña, J Alfaro-Shigueto
Reports were compiled of sunfish (family Molidae) by-catch in Peruvian small-scale fisheries and sunfish by-catch rates were estimated using data from shore-based and onboard monitoring programmes. A total of 114 sunfishes were reported in the longline and gillnet fisheries along the Peru coast from 2005 to 2017. Systematic monitoring effort of small-scale gillnets leads to an estimate of between 23 and 352 individuals captured annually by the fleet fishing from the northern port of Salaverry and central ports of Ancón and Chorrillos and suggests that the actual number captured by the Peruvian gillnet fleet is in the thousands of individuals...
November 13, 2018: Journal of Fish Biology
M B S Svendsen, J L Johansen, P G Bushnell, P V Skov, T Norin, P Domenici, J F Steffensen, A Abe
This study investigated the oxygen consumption of the putative oxygen conformer marbled swamp eel Synbranchus marmoratus during progressive hypoxia. Earlier studies have not reached agreement on whether S. marmoratus is a conformer or regulator. Our results support the view that S. marmoratus is an oxygen regulator, like most bony fishes. This article is protected by copyright. All rights reserved.
November 12, 2018: Journal of Fish Biology
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