Journal of fish biology最新文献

{"title":"Environmental salinity differentially impacts branchial and hepatic carbohydrate metabolism in tilapia.","authors":"Ryan J A Chang, Fritzie T Celino-Brady, Jason P Breves, Andre P Seale","doi":"10.1111/jfb.70095","DOIUrl":"https://doi.org/10.1111/jfb.70095","url":null,"abstract":"<p><p>In response to changes in environmental salinity, euryhaline fishes mobilize energy to support the active transport of ions across osmoregulatory epithelia. Glycogen synthase (GS) and glycogen phosphorylase (GP) are key controllers of carbohydrate metabolism due to their roles in promoting glycogenesis and glycogenolysis, respectively. However, the coordinated responses of GS, GP and glucose transporters (GLUTs) in the liver and gill to changes in salinity remain unresolved. In this study, we initially subjected Mozambique tilapia (Oreochromis mossambicus) to unidirectional transfers, either from fresh water (FW) to seawater (SW) or from SW to FW. We then transferred FW- and SW-acclimated tilapia to a tidal regime (TR) where salinity alternated between FW and SW every 6 h. Our goal was to characterize how carbohydrate metabolism is affected by unidirectional and tidal changes in salinity. Whether fish were transferred from SW to FW in a unidirectional manner or to a TR, glucose levels increased after transfer to FW or during the FW phase of the TR (TF). Conversely, hepatic glycogen levels were higher in fish in SW and the SW phase of the TR (TS) than in TF. In both FW and TF, branchial expression of the gill-specific isoform of GP (gpg) was downregulated, while gs was upregulated. Branchial gpg was upregulated in fish unidirectionally transferred from FW to SW or sampled during TS. Hepatic gp and gs expression increased following transfer from SW to FW. Thus, we consistently found that increases in salinity promoted branchial glycogen breakdown, while decreases in salinity led to hyperglycaemia. Moreover, while branchial glucose transporter 1 (glut 1) expression was downregulated after transfer from FW to SW, glut1 was transiently upregulated in the liver. In both liver and gill, glut1 expression was higher in fish in TF compared to TS. Gill filament explants incubated with cortisol exhibited reduced glut1 expression regardless of medium osmolality. Our collective data indicate that salinity differentially regulates hepatic and branchial carbohydrate metabolism.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144180315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low genetic variation and strong genetic structure across a range of geographical scales in European smelt (Osmerus eperlanus L.).","authors":"Niall J McKeown, Alix N Taylor, Niklas Tysklind, Amy J E Healey, Martin I Taylor, Andy R Beaumont, Ian D McCarthy","doi":"10.1111/jfb.70093","DOIUrl":"https://doi.org/10.1111/jfb.70093","url":null,"abstract":"<p><p>Populations of anadromous European smelt (Osmerus eperlanus L.) are declining across its range with mitigation efforts for this ecologically important species hindered by a lack of demographic information. Here, mitochondrial DNA (mtDNA) and microsatellite analyses were used to describe historical and recurrent demographics for the species across a large part of its range. mtDNA revealed a shallow phylogeographic structure indicating a cohesive ancestral population, low overall haplotype and nucleotide diversities. However, microsatellites revealed unexpectedly high genetic structuring (F_ST = 0.15; p < 0.0001), including (i) isolation by distance effects over various scales, (ii) separation between Baltic and Atlantic samples and (iii) the highest interpopulation divergence and the lowest intrapopulation variation among UK sites. The results indicate that despite considerable dispersal potential, there is strong structuring among rivers, which should be recognised as separate management units. Furthermore, individual clustering analyses revealed further population separation within waterways and the need to resolve isolating mechanisms. Overall levels of genetic variation were found to be lower than those reported for other osmerids, with evidence suggesting that a considerable portion of ancestral variation has been eroded. As such, low genetic variation may limit resilience to environmental change. Proactive management strategies are discussed, with the prioritisation of UK populations recommended.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144181673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Description of a new liopropomine basslet, Liopropoma terecaudum, from northern Taiwan (Perciformes: Epinephelidae).","authors":"Chi-Ngai Tang, Nok-Wai Lai, Hsuan-Ching Ho","doi":"10.1111/jfb.70086","DOIUrl":"https://doi.org/10.1111/jfb.70086","url":null,"abstract":"<p><p>Liopropoma terecaudum sp. nov. is described based on 12 specimens collected off northern Taiwan. The new species most closely resembles two sympatric species, L. japonicum and L. dorsoluteum, but differs from both species and all other congeneric species of Liopropoma based on the following combination of morphological and colouration characters: caudal fin round; dorsal-fin elements VIII, 13 and lacking a distinct notch; lateral side of body with a broad red stripe; base of caudal fin with a large red blotch. Phylogenetic analysis of mitochondrial DNA barcode sequences places L. terecaudum in a clade with L. dorsolutum and L. japonicum. The average genetic divergences between L. terecaudum and L. dorsoluteum, and between L. terecaudum and L. japonicum, are measured to be 11.8% and 11.9%, respectively. The description of L. terecaudum brings the total number of Liopropoma in Taiwanese waters to 11.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144182168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular characterization of Serrasalmidae hybrid in the upper Paraná River floodplain using molecular markers.","authors":"Laura Ivana Ramos, Eloisa de Páris Paz, Lidiany Doreto Cavalcanti, Ricardo Massato Takemoto, Alessandra Valéria de Oliveira","doi":"10.1111/jfb.70101","DOIUrl":"https://doi.org/10.1111/jfb.70101","url":null,"abstract":"<p><p>This study reports the molecular identification of a tambacu-a hybrid of Colossoma macropomum and Piaractus mesopotamicus-in the floodplain of the upper Paraná River using molecular markers. The PCR-GEL method, based on the analysis of COI and TROP fragments, successfully characterized the hybrid, while PCR-SEQ, employing RAG2 and TROP markers, identified variable sites that differentiate the parental species and the hybrid.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144158718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intraspecific variation in the sexual pattern of red-belted anthias, Pseudanthias rubrizonatus.","authors":"Emma Hinako Moritoshi, Haruka Matsumoto, Midori Matsuoka, Shinich Dewa, Gen Kume","doi":"10.1111/jfb.70091","DOIUrl":"https://doi.org/10.1111/jfb.70091","url":null,"abstract":"<p><p>Recent studies indicate that the sexual patterns of some species can vary with local population size and density, suggesting that protogynous species may shift to gonochorism in larger populations. Red-belted anthias Pseudanthias rubrizonatus, a protogynous hermaphrodite, forms diverse-sized groups in Kagoshima Bay, Japan (31.58°N, 130.66°E), from typical polygynous medium-sized groups with a few males and several females, to an unusually large group exceeding 10,000 individuals. This study aimed to determine the sexual pattern of P. rubrizonatus in different-sized groups. The research was conducted from July 2019 to June 2022. This study revealed the process from sexual differentiation to maturation, and discovered primary males through gonadal histology and otolith growth analysis. All juvenile gonads developed an ovarian lumen before sexual differentiation. Most differentiated to mature females (38.0-77.0 mm standard length [SL], 0-3 years, n = 197), then changed sex (52.0-79.3 mm SL, 2-3 years, n = 14) to secondary males. Sex change occurred year-round. All mature males (50.2-95.1 mm SL, 1-5 years, n = 83) exhibited distinct dimorphic and dichromatic features. Some juveniles underwent bisexuality around 100 days post-hatching; spermatocytes were found with primary-growth stage oocytes (25.5-46.9 mm SL, ≤1 year, n = 24). Primary males (50.2-65.5 mm SL, 1 year, n = 9) were collected only in the large group. These findings indicate intraspecific variation in sexual pattern depending on the group sizes, with diandric protogyny in the large group and monandric protogyny in medium groups. Diandric protogyny is unprecedented in Anthiinae. Although primary males emerge as group size increases, protogyny remains consistently maintained in P. rubrizonatus in Kagoshima Bay, with no evidence of gonochorism observed.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144158198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A very picky eater: Species-level prey selection in the endangered Rhone streber [Zingel asper (L. 1758)].","authors":"Kurt Villsen, Emmanuel Corse, Gaït Archambaud-Suard, Vincent Dubut","doi":"10.1111/jfb.70083","DOIUrl":"https://doi.org/10.1111/jfb.70083","url":null,"abstract":"<p><p>Prey preferences are important drivers of predator-prey interactions and trophic network structure. We present a species-level selection analysis for the endangered Zingel asper (L. 1758) and its prey within the Baetis (Ephemeroptera) genus. By combining robust diet metabarcoding data with fine-scale prey community data, we revealed that Z. asper selected four Baetis species differently, despite being largely considered as ecologically similar species. Our results suggest that fine-resolution analysis of prey selection may be key for understanding trophic interactions and for improving the conservation and management of fish.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144142598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biology and ecology of the ubiquitous estuarine clupeid Gilchristella aestuaria from southern Africa.","authors":"Alan K Whitfield","doi":"10.1111/jfb.70087","DOIUrl":"https://doi.org/10.1111/jfb.70087","url":null,"abstract":"<p><p>The estuarine roundherring Gilchristella aestuaria is a well-studied southern African endemic fish species. This widespread and abundant clupeid is an important food source for piscivorous fish species and is a major component of the planktonic food web in all types of estuaries on the subcontinent. Although breeding only occurs in estuarine and certain fresh waters, genetic mixing of populations can occur by adults moving along the coast and entering adjacent estuaries. The morphometry of the species can vary considerably, often reflecting contrasting turbidity and trophic conditions pertaining to different estuaries. A wide variety of topics are reviewed, including G. aestuaria distribution, abundance, phylogeography, habitat utilization, gene flow, breeding biology, larval ecology, diet, food consumption, trophic status and predation. In addition, the recent identification of the negative impacts of harmful algal blooms on the larvae and juveniles of this species is noteworthy, particularly as excessive nutrient inputs and eutrophication are becoming an increasing South African and global problem for fishes in estuaries.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144150660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Opportunistic predation on juvenile angelsharks Squatina squatina: The greater amberjack Seriola dumerili as a potential threat.","authors":"Hector Toledo-Padilla, Tomas Bañeras-Bosh, David Jiménez-Alvarado, Joanna Barker, Lucy Mead, David Jacoby, Francisco Reyes, Eva Meyers","doi":"10.1111/jfb.70088","DOIUrl":"https://doi.org/10.1111/jfb.70088","url":null,"abstract":"<p><p>The first documented case of predation on a juvenile critically endangered angelshark Squatina squatina by a greater amberjack Seriola dumerili was observed in 2024 at Las Teresitas Beach, Tenerife, Canary Islands. The sequence shows a roughtail stingray Bathytoshia centroura initially attempting to predate on S. squatina, which briefly escaped before being captured by S. dumerili. This observation provides new insights into predator-prey dynamics of S. squatina, highlighting the critical role of these interactions in shaping conservation strategies for critically endangered species.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144136133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Description of a new troglophilic loach, Schistura densiclava (Teleostei: Nemacheilidae) from Meghalaya, northeast India.","authors":"D Khlur Baiaineh Mukhim, Kangkan Sarma, Hrishikesh Choudhury, Rajdeep Das, Rejani Chandran, Rajeev K Singh, Deisakee P Warbah, Wandalin Lyngdoh, Uttam Kumar Sarkar, Dandadhar Sarma","doi":"10.1111/jfb.70092","DOIUrl":"https://doi.org/10.1111/jfb.70092","url":null,"abstract":"<p><p>Integrative taxonomy reveals a new troglophilic species of Schistura, from a cave-dwelling population inhabiting stream draining (Barak-Surma-Meghna drainage) through the Krem (=cave) Mawjymbuin in East Khasi Hills of Meghalaya. Morphologically, the new species is easily distinguished from its congeners in having a combination of characters, including a unique colour pattern in the form of 14-20 greyish black to faint black bars overimposed to a black midlateral stripe on a greyish brown to pale beige (yellowish green in life); pre-dorsal bars thin, numerous, wider than interspaces, weakly contrasted, sometimes broken and/or incomplete; bars posterior of anal-fin base numerous and variable, mostly broken or incomplete, located on lower flank, weakly contrasted; a complete lateral line; presence of an axillary pelvic lobe; an uninterrupted thick black stripe along the base of the dorsal fin; an incomplete black basicaudal bar, dissociated, occupying median one-third of caudal-fin base; conspicuous black botch on the procurrent rays of the upper lobe of the caudal fin; and a type of sexual dimorphism: males with slender body, bars mostly irregular on flanks and slightly puffy cheek with greater lateral head length; females with regular-shaped bars and swollen body. Analysis of the mitochondrial cytochrome c oxidase I (COI) gene sequence of the new species shows significant genetic divergence with p distances ranging 4.5%-13.6% from its sister species found in northeast India, supporting its report as new species. Further, this finding is also validated by phylogenetic analysis and the species delimitation approaches, Assemble Species by Automatic Partitioning (ASAP) and Poisson Tree Processes (PTP), which clearly resolved that the Schistura densiclava sp. nov. is distinct from its sister species. Although the species has been sampled from the cave, it retains a fully pigmented body and functional eyes, which are not reduced when compared to other epigean Schistura, tentatively indicating it as a troglophile. Distribution of the new species is limited to the cave, which suggests an endemism in this cave system.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144136076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inter- and intraspecific variation in the degree of marine-derived resources of amphidromous fishes.","authors":"Ryosuke Tanaka, Taiga Kunishima, Kentarou Hirashima, Tamihisa Ohta, Chikage Yoshimizu, Ichiro Tayasu, Hiromi Uno, Takuya Sato","doi":"10.1111/jfb.70084","DOIUrl":"https://doi.org/10.1111/jfb.70084","url":null,"abstract":"<p><p>Migratory animals often transport allochthonous materials, energy or organisms from donor to recipient ecosystems, thereby affecting the dynamics of consumers, communities and ecosystems in the recipient systems. The biomass of migrants is commonly assumed to be equal to that of the allochthonous materials they transport, with the inherent assumption that migrant bodies are produced purely from allochthonous resources. However, the extent to which the body composition of many migratory animals consists of allochthonous materials [e.g., the proportion of total body mass consisting of allochthonous resources, hereafter degree of allochthony (DOA)] may gradually decrease if the animals consume autochthonous resources during their migration. Ignoring this process leads to an overestimation of the magnitude and temporal features of material subsidies. In this study, we quantified the DOA of nine amphidromous fish species that migrate from marine to rivers, using the sulphur stable isotope (δ³⁴S) analysis. The DOA varied substantially among species (11%-82%) and even within species (Sicyopterus japonicus had the highest DOA: 22%-97%). Species with larger body sizes tended to exhibit a lower DOA. This trend was also observed at the species level for six of the nine species, with five species showing an additional pattern of later migrating individuals with lower DOA. These results imply that quantifying DOA is important for accurately estimating material subsidies across ecosystems, owing to the upstream migration of amphidromous fish. Life-history studies of amphidromous fishes are crucial for elucidating the mechanisms behind inter- and intraspecific variation in DOA, which ultimately contributes to a better understanding of marine-river ecosystem linkages mediated by these fishes.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144110446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}