Journal of fish biology最新文献

{"title":"Community science datasets identify the spatial occurrence and hotspots of flapper skate (Dipturus intermedius).","authors":"Danielle L Orrell, Ciara Wögerbauer, Shane O'Reilly, Thomas K Doyle, William Roche","doi":"10.1111/jfb.70248","DOIUrl":"https://doi.org/10.1111/jfb.70248","url":null,"abstract":"<p><p>The flapper skate, Dipturus intermedius (Parnell, 1837), is a large-bodied, slow-growing and late-maturing, Critically Endangered elasmobranch with a constrained population distribution. Here, we use two longitudinal community science datasets to investigate the occurrence of flapper skates in Irish waters. The two datasets are as follows: the Inland Fisheries Ireland mark-recapture tagging programme (1972-2021; n records = 1188) and Irish Specimen Fish Committee records (1958-2022, n records = 489). Of the 1677 records, 767 were identified as mature based on size-based thresholds (n males = 418, n females = 349). Hotspots of immature and mature individuals were identified across the south, southwest, north and northwest coasts of Ireland. Flapper skates were predominantly caught within 12 NM of the coast in the summer to early autumn (June-October). Time at liberty ranged from 0 to 11.5 years [mean years ± standard deviation (SD) = 1.5 ± 1.6]. Recapture events were typically <50 km from their initial capture location (93% of individuals), with dispersal distances of up to 171 km recorded. This study demonstrates that mature female and male flapper skate immature female flapper skate exhibit interannual site fidelity with short dispersal distances and move within existing ICES stock management areas.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145251488","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":"Bull trout (Salvelinus confluentus) exhibit binge-feeding and digestive flexibility during seasonal resource pulses associated with salmon migrations.","authors":"Adam M Kanigan, Scott G Hinch, Andrew G Lotto, Patrick Zubick, Nathan B Furey","doi":"10.1111/jfb.70242","DOIUrl":"https://doi.org/10.1111/jfb.70242","url":null,"abstract":"<p><p>Resource pulses are infrequent, ephemeral events of resource hyperabundance that can represent important feeding opportunities for consumers. To capitalize on pulsed resources, consumers can exhibit behavioural and physiological traits including binge-feeding and phenotypic plasticity of digestive physiology, although expression of these traits has not been observed simultaneously. Further, past studies of binge-feeding have largely focused on times and locations where resources were highly concentrated, ignoring potential temporal and spatial variation in consumer responses. We investigated these traits in bull trout Salvelinus confluentus that experience seasonal resource pulses associated with the spring migration of sockeye salmon Oncorhynchus nerka smolts and their fall spawning migrations in a large lake-river system. We also examined spatial variation in S. confluentus diet and feeding behaviour within seasons to explore associations with proximity to aggregated salmon. To do this, we collected S. confluentus stomach contents and analysed consumption rates across seasons and capture locations. We also investigated if the size of digestive organs changed with season. In the spring and fall, S. confluentus consumed O. nerka smolts and eggs, respectively, at high rates, with consumption often exceeding theoretical daily maximums by up to 21.50-fold in the spring and 7.69-fold in the fall. The degree of binge-feeding was correlated with proximity to the lake outlet where smolts and spawning salmon congregate, increasing by 1.21-fold in the spring and 2.78-fold in the late fall for each ~13-km shift in capture location towards the outlet. Salvelinus confluentus also exhibited larger digestive organs during the spring and fall, while the same organs were atrophied during the summer. Our results indicate that a single consumer population can exhibit both behavioural and physiological responses to resource pulses, and that exploitation can vary along a spatial gradient of presumed resource availability. These responses emphasize the importance of resource pulses to consumers and the potential for intra-population differences in consumer responses to transient feeding opportunities.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145251445","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":"Spectral characteristics of visual pigments in two mullet species (Pisces, Mugilidae).","authors":"Sergei L Kondrashev, Nina E Lamash","doi":"10.1111/jfb.70252","DOIUrl":"https://doi.org/10.1111/jfb.70252","url":null,"abstract":"<p><p>The spectral properties of photoreceptors in two closely related fish species of the family Mugilidae, differing in their preferred salinity habitat, were subjected to a comparative study using microspectrophotometry and liquid chromatography. The results have shown that both species are tetrachromats and possess two classes of single cones and two classes of double cones, with paired elements containing visual pigments with the same absorption maximum (λ_max). In the flathead grey mullet (Mugil cephalus), a predominantly marine species, the rods and the single (two classes) and double cones (two classes) contain rhodopsins with λ_max = 506, 464, 518, 560 and 574 nm, respectively. In the so-iuy mullet (Planiliza haematocheilus), with a freshwater life-history stage, the photoreceptors contain a mixture of rhodopsin and porphyropsin in different proportions. In different P. haematocheilus individuals, values of λ_max of the rods and the single and double cones vary in the following ranges: 501-522, 462-470, 518-539, 573 and 570-620 nm, respectively. The set of visual pigments indicates the identity of opsins in both species, whereas the long-wave shift in the spectral sensitivity in P. haematocheilus is due to a changed composition of the pigment mixture with a greater proportion of porphyropsin that utilizes the same opsins as in M. cephalus. The conclusion about the consistency of our results with the previously found correlation between the supposed connections of horizontal retinal cells and individual chromatic classes of photoreceptors in mullets is made based on literature data. The present study, in combination with studies on the molecular genetics structure of photopigments, can contribute to further development of views on the evolution of visual pigments.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145244459","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":"Acclimation effect on fish migratory characteristics: determination of appropriate acclimation period for Chinese sturgeon, Acipenser sinensis.","authors":"Yanhua Li, Jia Hu, Kelei Zhang, Yinlin Xiong, Zhen Wei, Hao Du, Li Shen","doi":"10.1111/jfb.70250","DOIUrl":"https://doi.org/10.1111/jfb.70250","url":null,"abstract":"<p><p>The acclimation period is a crucial and controllable factor in managing fish stress prior to behavioural observations. However, research in this area-particularly regarding its effects-remains limited. In the present study, we investigated the effect of acclimation duration (up to 265 min during the day and up to 525 min at night) on the migratory characteristics of juvenile Chinese sturgeon (Acipenser sinensis). The appropriate acclimation period for juvenile Chinese sturgeon was determined based on two observational indicators (migratory speed and activity intensity) and one statistical core (coverage probability). Our results indicate that the appropriate acclimation period was not influenced by the observational indicators or social community relationships (one-tailed vs. group), but was significantly affected by circadian rhythms (day vs. night). Specifically, the minimum acclimation period required for juvenile sturgeon to adjust their activity to a more stable level is 1 h during the day and approximately 3 h at night. These significant circadian differences may be attributed to the physiological stress experienced by the fish due to dark adaptation, suggesting that dark adaptation and acclimation duration are critical for managing fish stress prior to behavioural observations. This study not only clarifies the ecological or anthropogenic factors influencing fish acclimation periods but also establishes a standardized method for determining the acclimation period. Although the behavioural indicators may not be applicable to non-migratory fish, the novel methods and findings provide valuable references for fish acclimation research. Furthermore, this research offers a new solution for standardizing animal behavioural studies, including those involving fish, thereby enhancing the stability and reliability of behavioural data and promoting effective animal stress management.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145238748","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":"Phylogeography of the widely distributed John Dory (Zeus faber, Actinopterygii: Zeiformes) reaffirms the prevalence of at least two deeply divergent clades.","authors":"João Tadeu Fontes, Kenza Mokhtar-Jamaï, Zakariya Nchioua, Jean-Dominique Durand, Monica Landi, João Meira, Luís Machado, Ayoub Baali, Ignacio Sobrino, Iça Barri, Emmanuel Kouamé, Béatrice Abouo Adepo-Gourène, Mamadou Diop, Néné Gallé Kidé, Austin Saye Wehye, Zacharie Sohou, Miguel Carneiro, Rogélia Martins, Pedro Soares, Filipe Oliveira Costa","doi":"10.1111/jfb.70245","DOIUrl":"https://doi.org/10.1111/jfb.70245","url":null,"abstract":"<p><p>The John Dory Zeus faber is a commercially exploited demersal fish species with a known distribution ranging from the Northeast Atlantic to parts of the Indian and Pacific oceans. A previous genetic survey using cytochrome c oxidase subunit I (COI) DNA barcodes suggested the presence of two geographically segregated taxonomic units within Z. faber. We revisit this hypothesis by expanding the number and geographic coverage of DNA barcodes, addressing a major data gap along parts of the Atlantic coast of Africa and conducting a comprehensive phylogeographic analysis. Our findings consolidated the existence of two highly divergent mitochondrial clades, Clade A and Clade B (mean K2P distance: 7.4%), with the transition zone between them located along the Atlantic coast of Morocco. Clade A exhibited no phylogeographic structure, with haplotypes shared between Northeast Atlantic and Mediterranean populations. Conversely, four geographically structured subclades (mean K2P distance: 0.9%) were detected within Clade B, extending south and eastward from Morocco to Japan and New Zealand. Historical demographic events driving allopatric divergence, along with oceanographic and environmental factors, likely shaped the current geographic distribution of the two clades. These findings not only prompt the need to re-evaluate the taxonomic status of Z. faber but also highlight the probable existence of multiple evolutionarily significant units (ESUs) that must be considered in the scope of stock assessment, fisheries management and conservation purposes.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145232697","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":"New insights into Ituglanis (Siluriformes: Trichomycteridae) diversity in Bahia State, eastern Brazil: Description of a new species and conservation status reappraisal.","authors":"Paulo J Vilardo, Axel M Katz, Wilson J E M Costa","doi":"10.1111/jfb.70246","DOIUrl":"https://doi.org/10.1111/jfb.70246","url":null,"abstract":"<p><p>The northeastern Atlantic Forest of Brazil harbours a remarkable diversity of species of Trichomycteridae, many of which remain poorly understood. This study describes a new species of Ituglanis, endemic to the Ribeirão São Roque, a stream tributary of Rio Piabanha, an affluent of Rio Colônia basin, Bahia State, Brazil. The new species is distinguished from its congeners by a combination of the following characters: four pairs of ribs; 35 post-Weberian vertebrae, seven pectoral-fin rays; and a colour pattern consisting of irregular dark brown spots along the flanks and dorsal region. The specimens were encountered during field studies conducted in southern Bahia State aimed at collecting Ituglanis cahyensis and Ituglanis agreste. However, despite extensive efforts, neither of these species was found during surveys, suggesting potential population declines. Additionally, we reassess the conservation status of the species of Ituglanis from Bahia State, proposing status updates for three of the four previously described species based on recent field data and habitat assessments. The discovery of this new species underscores the urgent need for further exploration and collection in poorly sampled areas of the Atlantic Forest. Human activities, including deforestation and habitat degradation, continue to threaten these unique ecosystems. As demonstrated here, the description of new species contributes not only to a better understanding of biodiversity and evolutionary relationships within Ituglanis but also to conservation efforts in one of the most endangered biodiversity hotspots in the world.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145232676","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":"Do offspring characteristics reflect parental migration variation?","authors":"Madeleine Berry, Jan G Davidsen, Marie Nevoux, Kim Aarestrup, Carlos M Alexandre, Sara S Silva, Alexander Thorén, Anders Engstöm, Matilda Ahvenainen, Johan Höjesjö","doi":"10.1111/jfb.70247","DOIUrl":"https://doi.org/10.1111/jfb.70247","url":null,"abstract":"<p><p>Sea trout, Salmo trutta, display a wide range of migratory behaviours, and one aspect of variation comes from freshwater migration distance. The overall aim of this study was to determine if offspring of long- and short-distance migrants exhibited phenotypic differences relating to parental migration distance. For that purpose, we conducted several behavioural tests (dyadic contest, boldness scoring and open field test) and morphological analysis (relative pectoral-fin length) in multiple freshwater systems across the distribution range of the target species in Europe. It was expected that offspring of long-distance migrants would be more active, bold and dominant than those of short-distance migrants and would have longer pectoral fins relative to body length. Additionally, we investigated if boldness varied in relation to latitude. We showed that offspring of long-distance migrants were more dominant in two cases and more active in one case than those of short-distance migrants; however, there was no difference in swimming distance or velocity. Boldness and relative pectoral-fin length were significantly related to site of origin; however, the direction of this relationship differed between systems. Generally, we detected a decrease in boldness with declining latitude. In summary, we have detected variation among juveniles related to location within a stream; however, the drivers and processes behind these are likely more complex than purely parental migratory strategy. Our results can inform suitable management and conservation efforts directed to anadromous Salmo trutta. For example, habitat restoration and removal of migration barriers can increase the possible range of migration distances helping maintain the phenotypic diversity of offspring.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145225121","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 new species of Peckoltia (Siluriformes, Loricariidae) from the rapids of the Rio Tocantins-Araguaia basin, Brazil.","authors":"Felipe Arian Andrade de Araújo, Marlon Felipe Chumber Ferreira, Aline Nascimento Silva, Wolmar Benjamin Wosiacki","doi":"10.1111/jfb.70235","DOIUrl":"https://doi.org/10.1111/jfb.70235","url":null,"abstract":"<p><p>Here, we describe a new species of Peckoltia (Loricariidae; Hypostominae) from the rapids of the Rio Tocantins-Araguaia basin, previously identified as Peckoltia vittata, using an integrative taxonomy approach. The new species is distinguished from congeners by ventral region presenting diffuse stripes on surface, not presenting spots or blotches on head and body, elongated odontodes on cheeks reaching the pectoral-fin spine when adpressed to body, space between the eyes not entirely covered by a blotch, parieto-supraoccipital moderately elevated, not forming an apparent crest, 14-26 teeth on premaxilla, 15-24 teeth on dentary, diminute plates with short odontodes on base of pectoral fins, and anterior part of urogenital opening, a less developed suspensorium, a prominent lateral wall of metapterygoid channel with sturdy base, including conspicuous ornated edges, adductor palatine crest forming a diminute roughly perceptible salient, diminute hyomandibula concave triangular shape. The phylogeny based on Cytb molecular marker recovered the new species placed with congener species, congruent with the morphological classification findings.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145225453","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":"Three new species of Poptella (Characiformes: Acestrorhamphidae: Stethaprioninae) from the Tocantins-Araguaia river system, central-northern Brazil.","authors":"James R Garcia-Ayala, Claudio Oliveira, Ricardo C Benine","doi":"10.1111/jfb.70218","DOIUrl":"https://doi.org/10.1111/jfb.70218","url":null,"abstract":"<p><p>Examination of extensive comparative material currently identified as Poptella compressa has enabled us to verify the existence of three new species. These three species are characterized by nine branched dorsal-fin rays. Poptella magnuspina sp.n has the following diagnostic characteristics: a longer predorsal spine, larger hooks, and a smaller pelvic fin in sexually mature males, and it is widely distributed in the Rio Tocantins-Araguaia basin of Brazil. Poptella spinula sp.n, distributed in the upper Rio Tocantins and middle and upper Rio Araguaia, is distinguished from all its congeners, with the exception of P. longipinnis, by the long first rays of the dorsal fin, a spot present on the upper lobe of the caudal fin, and a shorter predorsal spine. Finally, Poptella abathes sp.n is distinguished from congeners by having a comparatively larger mouth and a shallower body. This species is currently found only in the upper Rio Araguaia.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145206597","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":"FFM-ViT: an efficient fish species classification method based on deep features and transformers.","authors":"Yuwei Gao, Xiaoyong Li, Jian Xiang, Yunjie Xie, Chen Yang, Wan Xiang","doi":"10.1111/jfb.70213","DOIUrl":"https://doi.org/10.1111/jfb.70213","url":null,"abstract":"<p><p>Morphological identification of fish species plays a crucial role in the monitoring and management of fishery resources and biodiversity conservation. However, existing classification methods fail to meet practical needs when confronted with small fish data sets and high similarity. In this paper, we propose a novel deep learning method called feature fusion module vision transformer (FFM-ViT). The essence of FFM-ViT lies in abandoning the direct patch operation used in traditional vision transformer (ViT) and introducing Mobile Inverted Bottleneck Convolution (MBConv) and Fused Mobile Inverted Bottleneck Convolution (Fuse-MBConv) blocks to obtain more accurate high-dimensional information. To enhance feature extraction capability and channel feature fusion, we also introduce the channel spatial merge attention (CSMA) module. Furthermore, we have curated a dataset consisting of 78 categories named Oceanfish78. Our model achieves an impressive accuracy rate of 90.2% on this dataset, surpassing the 80.4% accuracy achieved by the ViT model without pre-trained weights significantly. Additionally, we conducted tests on several datasets, such as fish4knowledge and Fish31, while comparing our proposed method with other deep learning models, including shufflenet, convnext and swin transformer, through comprehensive empirical analysis. The results demonstrate that our proposed method outperforms existing approaches comprehensively, not only providing an effective solution for fish classification, but also offering valuable insights for approximate target recognition in other environments.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145199658","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}