Journal of fish biology最新文献

{"title":"Size-dependent preference for low water temperature in juvenile chum salmon (Oncorhynchus keta) during the migration period.","authors":"Arimune Munakata, Saori Kato, Ryoka Araya","doi":"10.1111/jfb.70045","DOIUrl":"https://doi.org/10.1111/jfb.70045","url":null,"abstract":"<p><p>Recently, sea surface temperature (SST) has increased around Japanese coastal areas, and it has been pointed out that the survival rate of hatchery-released chum salmon (Oncorhynchus nerka) has decreased, partly due to the influence of high SST. To investigate the characteristics of juveniles that prefer low water temperatures, potentially indicating an active northward migration in Japan's coastal waters, we examined the relationship between low water temperature preference and body shape in juvenile chum salmon. Behavioural experiments were conducted between 11 and 18 May using tanks that allowed juveniles to move freely and choose between low- and high water temperature areas. A total of 158 juveniles were tested across five trials, with 35 individuals in four trials and 18 individuals in an additional trial, randomly selected for each experiment. The selection rate for low water temperature areas, as well as the average standard length (Ls) and body mass (M), increased with the number of trials. Juveniles that preferred low water temperatures exhibited greater Ls and M but a lower condition factor (K) compared to those selecting the high water temperature area. Following the behavioural experiments, both groups were reared separately at an intermediate temperature, and their Ls and M were measured every 13-17 days. Growth rates appeared to be maintained in both groups, as Ls and M, but not K, continued to increase between 18 May and 16 June. These findings suggest that well-growing juveniles with lower K values may actively show water temperature preferences. This preference for lower temperatures may drive fish to migrate northward in search of cooler waters in the North Pacific Ocean.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144753540","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":"Effect of flow velocity variation on individual behaviour and collective cohesion of two fish species.","authors":"Chenyang Cao, Dongqiu Li, Shikang Liu, Yuqian Xi, Hao Zheng, Guoan Yu, Xiaoming Yan, Lijian Ouyang, Weiwei Yao","doi":"10.1111/jfb.70156","DOIUrl":"https://doi.org/10.1111/jfb.70156","url":null,"abstract":"<p><p>Proper recognition of fish swimming and collective behaviours hold great significance in the development of fish conservation. The influence mechanism of hydrodynamic parameters on fish collective and swimming behaviours remains incompletely established. This study investigated the individual and collective behaviours of juvenile Hemibarbus maculatus Bleeker and Dabry's sturgeon (Acipenser dabryanus) under various flow velocities [≈1-7 body length (BL/s)] from laboratory experiments and video analysis. Fish individual behaviours were quantified using tail-beat kinematics, and five collective metrics were used to evaluate fish collective behaviour. The results demonstrated that increasing flow velocity had a significant impact on the tail-beat movement of fish individuals, and collective behaviour had the potential to reduce swimming energy expenditure of fish individual in shoals. Meanwhile, the two species exhibited significant collective differences, and enhancing flow velocity can promote fish collective effects for both species with an upper limit. Various configurations and formations were adopted by fish shoals to cope with different flow velocities and optimize swimming efficiency. The results of this work contribute to fish conservation and a deeper understanding of collective behaviour in fish.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144753538","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":"Liver transcriptome profiling of the largemouth bass (Micropterus salmoides) suggests host immunoregulatory mechanism in response to Edwardsiella tarda infection.","authors":"Huijuan Chen, Can Feng, Qiyi Zhang, Qinghuan Zhang, Yufan Huang, Xiangning Chen, Yingli Gao, Huan Gao, Huanzhang Liu","doi":"10.1111/jfb.70138","DOIUrl":"https://doi.org/10.1111/jfb.70138","url":null,"abstract":"<p><p>As a non-native species, largemouth bass (Micropterus salmoides) has become an important economically farmed fish in China. In recent years, although the aquaculture industry has suffered significant commercial losses due to Edwardsiella tarda infection, knowledge of the interactions between E. tarda and this fish species is still limited. This study conducted RNA sequencing in the liver of largemouth bass at 1 day post-infection with E. tarda to investigate the associated immunoregulatory mechanisms. Compared to the control group, 3198 differentially expressed genes (DEGs) were identified, including 1765 upregulated and 1433 downregulated genes, which were enriched in 874 gene ontology (GO) terms and 160 Kyoto Encyclopaedia of Genes and Genomes (KEGG) pathways. Further annotation and enrichment analysis revealed significant changes in pattern recognition receptor (PRR)-mediated signalling pathways, pro-inflammatory cytokines, phagosomes, lysosomes, adaptive immunity-related genes and metabolism-related pathways, suggesting that largemouth bass infected with E. tarda elicited a robust innate immune response, accompanied by antigen-specific T/B cell activation and metabolic dysregulation. This research provides new insights on the immunoregulatory mechanism of largemouth bass in response to E. tarda infection, offering a valuable foundation for future research.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144753539","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":"Application of MobileNet and Xception neural networks to identify Sillago sihama populations in Vietnam's coastal waters based on otolith morphology.","authors":"Quyet Thanh Vu, Tan Dung Pham","doi":"10.1111/jfb.70130","DOIUrl":"https://doi.org/10.1111/jfb.70130","url":null,"abstract":"<p><p>Classification of Indo-Pacific whiting (Sillago sihama) from three coastal regions of Vietnam revealed distinct population structures using otolith morphology. All three analytical approaches - traditional morphometrics using basic dimensional parameters and shape indices (BDP-ShI), elliptic Fourier descriptors (EFD) and deep learning models - consistently identified the presence of three distinct populations along the Vietnamese coast. EFDs and traditional shape indices achieved moderate performance, with BDPs-ShIs and EFD reaching average accuracies of 65.92% and 84.67%, respectively. Deep learning models significantly improved classification: MobileNet and Xception achieved 90.50% and 90.33% accuracy, respectively. Linear discriminant analysis confirmed greater overlap between Son Cha and Cat Ba samples, suggesting intermediate morphological characteristics. These results demonstrate that deep learning models better capture complex otolith shape variation and offer scalable tools for fish population identification.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144742250","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":"Comparison of growth performance and non-specific immunity of Nile tilapia (Oreochromis niloticus) fed with non-germinated and germinated faba bean.","authors":"Xi Xie, Meiyan Chen, Qingqing Li, Ling Yang, Zhendong Qin, Lijuan Zhao, Shaowen Liang, Li Lin","doi":"10.1111/jfb.70121","DOIUrl":"https://doi.org/10.1111/jfb.70121","url":null,"abstract":"<p><p>Faba bean (Vicia faba L.) has garnered interest from the aquatic feed industry as a plant-based ingredient that may enhance muscle hardness and crispness in tilapia. However, faba beans contain numerous anti-nutritional factors (ANFs) that could affect animal growth and health through their metabolic products. Germination effectively reduces the content of ANFs in faba beans; however, the effects of germinated faba beans on tilapia growth and non-specific immunity remain unclear. In this study, the growth parameters, antioxidant activity, carbon metabolic enzyme activity and immune-related gene expression profiles of tilapia fed with germinated faba beans (FB1 and FB5 groups) and non-germinated faba beans (FB0 group) were compared. The FB1 and FB5 groups exhibited heavier body weight (514.39 ± 111.66 g and 546.87 ± 98.16 g) compared to the FB0 group (392.53 ± 78.34 g) on day 80 (p < 0.05). A reduction in oxidative damage to the hepatopancreas was observed in the FB1 and FB5 groups compared to the FB0 group; FB5 showed significant lower levels of malondialdehyde (FB5: 5.84 ± 0.28 nmol/mg protein, FB0: 10.88 ± 0.72 nmol/mg protein), catalase (FB5: 45.51 ± 7.13 U/mg protein, FB0: 178.71 ± 4.53 U/mg protein), superoxide dismutase (FB5: 38.42 ± 1.42 U/mg protein, FB0: 38.42 ± 1.42 U/mg protein) and glucose-6-phosphate dehydrogenase (FB5: 16.78 ± 1.93 nmol/mg protein, FB0:6.31 ± 1.01 nmol/mg protein) activities in serum on day 80. Lower carbon metabolic enzyme activities were observed in the FB1 and FB5 groups than in the FB0 group. The immune-related gene expression levels of interleukin-1 beta (IL-1β), C-C motif chemokine ligand 3 (CCL3) and tumour necrosis factor-alpha (TNF-α) were downregulated initially and then gradually upregulated by day 80. Expression of heat shock protein 70 (Hsp70) upregulated in the FB1 and FB5 groups relative to that in normal tilapia (control). These findings suggest that incorporating faba beans into tilapia feed may reduce oxidative stress and modulate immune responses in tilapia cultures.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144731556","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":"Apristurus iterum, a new shark discovered based on egg case morphology and sequence data obtained from a formalin-fixed specimen.","authors":"William T White, Helen L O'Neill, Sahan A Jayasinghe","doi":"10.1111/jfb.70147","DOIUrl":"https://doi.org/10.1111/jfb.70147","url":null,"abstract":"<p><p>Apristurus iterum, a new species of deepwater catshark, is described from northeastern Australia. The new species is diagnosed through examination of its unique egg case morphology based on a single whole gravid female specimen and 10 egg cases deposited in different Australian ichthyological collections. This discovery prompted a more detailed investigation of Apristurus specimens collected off Queensland, northeastern Australia. The voucher of the gravid female with two egg cases, previously identified as 'Apristurus', collected off southeast Queensland, was designated as the holotype and used to describe the new species. The egg cases of A. iterum n. sp. differ from other Australian congeners by possessing distinct, weakly T-shaped, longitudinal ridges on the dorsal and ventral surfaces. A recently developed molecular approach was successfully applied to extract viable genetic material from the formalin-fixed holotype specimen. The extracted DNA underwent high-volume next-generation sequencing, and the resulting data were processed using a targeted mitochondrial genome alignment approach to generate a short, 160-nucleotide fragment of the cytochrome c oxidase subunit I (COI) gene, which was used for maximum likelihood phylogenetic analysis. The phylogenetic relationships and egg case morphology strongly support this species as being most closely related to Apristurus ovicorrugatus from northwestern Australia and Apristurus nakayai from New Caledonia and Papua New Guinea, with these three species representing a new subgroup within the Apristurus brunneus group.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144731600","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":"Riverward migration associated with food acquisition in adult Japanese seabass Lateolabrax japonicus: evidence from stable sulphur isotope ratios and otolith Sr:Ca ratios.","authors":"Ayano Medo, Kazuha Takai, Mari Kuroki, Hiromichi Mitamura, Manabu Kume, Keita W Suzuki, Daichi Kojima, Toshihiro Wada, Yoh Yamashita","doi":"10.1111/jfb.70137","DOIUrl":"https://doi.org/10.1111/jfb.70137","url":null,"abstract":"<p><p>The Japanese seabass (Lateolabrax japonicus) spawns offshore in winter, and certain adults exhibit riverward migration during the pre-spawning period (spring to autumn). However, the significance of this migration remains unclear. This study aimed to assess the dietary and migration histories of adult Japanese seabass between marine and riverine habitats using stable sulphur isotope ratios (δ³⁴S) and otolith strontium:calcium (Sr:Ca) ratios. In addition, we examined the effects of riverine prey consumption on body condition by comparing the δ³⁴S values with body condition factors. The δ³⁴S analyses of gonads and red blood cells estimated that riverine prey comprised 38.5% (95% credible interval = 24.2-64.3%) of the diet of Japanese seabass during 6 months before the spawning season. The δ³⁴S values of gonads tended to decrease as the number of otolith Sr:Ca ratios meeting the river residence criterion (4.4 × 10^-3) increased. In adult Japanese seabass, no significant relationship between the δ³⁴S values of gonads and body condition factors was observed, indicating that Japanese seabass with a high consumption rate of riverine prey could maintain a body condition similar to that of marine prey. The use of both marine and riverine habitats by adult Japanese seabass is likely to be a beneficial behaviour that increases feeding opportunities for the population.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144707706","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":"Stress-linked morphological change associated with rearing techniques of hatchery-reliant endemic landlocked Atlantic salmon (Salmo salar m. sebago).","authors":"Aurora Hatanpää, Hannu Huuskonen, Jorma Piironen, Raine Kortet, William Bernard Perry","doi":"10.1111/jfb.70149","DOIUrl":"https://doi.org/10.1111/jfb.70149","url":null,"abstract":"<p><p>Domestication effects caused by hatchery rearing impact various traits in fishes. Lake Saimaa landlocked salmon (Salmo salar m. sebago) have been dependent on hatchery propagation for over 50 years. The population is therefore at risk of hatchery-induced phenotypes, which can be suboptimal in the wild, thus impacting the long-term viability of the already critically endangered population. To assess the impact of rearing techniques, one-summer-old landlocked salmon morphology and asymmetry (an indicator of stress) was compared between four different hatchery rearing backgrounds, with all fish originating from the same family groups. The first group was maintained under standard hatchery conditions, the second under enriched rearing conditions (varying water level, direction and velocity), the third in semi-natural hatchery conditions (outdoor stream ponds and natural prey) and the fourth group experienced wild conditions (stocked in the River Ala-Koitajoki as alevins in spring and electrofished in September). Fish were photographed from both left and right sides and morphology was compared between rearing types using classical linear measurements as well as geometric morphometrics. Results indicate that natural conditions produce more symmetrical fish that have longer pectoral fins than their hatchery conspecifics, whereas fish reared in semi-natural conditions show increased asymmetry. These results suggest that different rearing types elicit varying levels of stress, and that conservation efforts encouraging early-stage stocking in the wild could be recommended when natural reproduction is not possible.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144707707","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":"Early stakeholder cohesion in wild-capture freshwater ornamental fisheries can support conservation outcomes.","authors":"Josie South, Erin Cadley, Peter Liptrot, Fitri Sil Valen, Ahmad Fahrul Syarif, Darmawan Setia Budi, Heok Hui Tan, Veryl Hasan","doi":"10.1111/jfb.70154","DOIUrl":"https://doi.org/10.1111/jfb.70154","url":null,"abstract":"","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144707705","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":"Comparative study on ecosystem structure and energy flow in the middle Yangtze River, China.","authors":"Xiao Chu, Zhonglian Jiang, Huan Lei, Jianqun Guo","doi":"10.1111/jfb.70148","DOIUrl":"https://doi.org/10.1111/jfb.70148","url":null,"abstract":"<p><p>The ecosystem of inland river has been affected by frequent human activities. To assess the impact of waterway regulation projects on the ecosystem structure and energy flow in the middle reaches of the Yangtze River, ecological survey data were collected before and after Waterway regulation project (July 2011 and July 2015). An Ecopath model comprising 20 functional groups was constructed to quantify trophic levels (TL), ecotrophic efficiency (EE) and system-level parameters [total primary production/total respiration (TPP/TR), connectivity index (CI) and system omnivory index (SOI)], aiming to reveal the ecological disturbances induced by the waterway regulation projects. The results demonstrated that the trophic levels of the functional groups concentrated in the range of 1 to 3.3, among which the trophic level of Siniperca chuatsi was the highest (3.239 in 2011; 3.225 in 2015). Ecosystem energy flow mainly concentrated in trophic levels I and II, with level I energy flow accounting for 60.5% and 83.3% of the total in 2011 and 2015, respectively. The comparative study found that the TPP/TR value increased from 1.063 in 2011 to 3.410 in 2015, whereas the CI and SOI decreased by 0.003 and 0.015. It is concluded that the stability of the ecosystem in the middle reach of Yangtze River declined and entered an immature stage in the study period. The comparative study on ecosystem structure and energy flow would provide a guidance for the sustainable inland shipping in the Yangtze River.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144698714","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}