Journal of fish biology最新文献

{"title":"Giants in the cold: Morphological evidence for vascular heat retention in the viscera but not the skeletal muscle of the basking shark (Cetorhinus maximus).","authors":"C Antonia Klöcker, Axel Schlindwein, Martin C Arostegui, Ingrid M Bruvold, Joel V Wernström, Montserrat Martin-Armas, David W Sims, Nicolas Straube, Andreas Altenburger, Claudia Junge","doi":"10.1111/jfb.70052","DOIUrl":"https://doi.org/10.1111/jfb.70052","url":null,"abstract":"<p><p>Fewer than 50 of the over 30,000 extant species of fishes have developed anatomical specializations facilitating endothermy in specific body regions. The plankton-feeding basking shark (Cetorhinus maximus), traditionally classified as an ectotherm, was recently shown to have regionally endothermic traits such as centralized red muscle (RM) along its body trunk and elevated (white) muscle temperatures. However, key anatomical features essential for classification as a regional endotherm, such as the presence of vascular rete mirabile, could not be confirmed in this cold-water giant. This study compared the morphology of heat-generating and heat-retaining tissues - associated with skeletal RM, the cranium and viscera - in the basking shark with those of a confirmed regional endotherm, the porbeagle (Lamna nasus), and a polar ectotherm, the Greenland shark (Somniosus microcephalus). Despite the presence of more medial RM in the basking shark's trunk, the absence of paired lateral vessels and a perfusing rete strongly suggests a lack of RM endothermy in this species. However, the presence of small arterial plexuses in the orbit, along with the discovery of visceral retia associated with the stomach, spleen and valvular intestine, in addition to distinct vascular arrangements in the liver and kidney, indicates potential for cranial and, particularly, visceral endothermy in C. maximus. These specializations, combined with reduced conductive heat loss from partial RM internalization and large body size, may enable C. maximus to maintain regionally elevated body temperatures, facilitating their active lifestyle also in cold-water environments. Enhanced sensory perception and digestive efficiency may aid prey acquisition and processing in the dimly lit meso- and bathypelagic zones, as well as high-latitude regions. Our findings provide initial insights into the thermal adaptations of these circum-globally distributed, highly migratory ram filter feeders. Further research is needed to better understand the eco-physiological implications of these adaptations, especially in the context of rapid ocean warming across their range, including Atlantification in the Arctic, and other anthropogenic pressures in the Anthropocene.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144013525","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":"Age and growth of the Pacific goliath grouper (Epinephelus quinquefasciatus), the largest bony reef fish of the Tropical Eastern Pacific.","authors":"Carolina Chong-Montenegro, Matthew T Craig, Gustavo A Castellanos-Galindo, Brad Erisman, Peter G Coulson, Uwe Krumme, Rodrigo Baos, Luis Zapata, Angel Vega, D Ross Robertson","doi":"10.1111/jfb.70078","DOIUrl":"https://doi.org/10.1111/jfb.70078","url":null,"abstract":"<p><p>We examined the age and growth of the Pacific goliath grouper (Epinephelus quinquefasciatus) from 210 samples collected from the main fish markets in Panama and Colombia. Ages from otoliths ranged from young-of-the-year to 13 years, predominantly between 1 and 4 years. The von Bertalanffy growth parameters were L∞ = 207 cm, k = 0.13 year^-1 and t₀ = -1.87 years. Instantaneous mortality rates (Z) were estimated at 36% in Colombia (ages 2-11) and 26% in Panama (ages 2-13).</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144012234","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":"Hormonal regulation and expression dynamics of Bmp4 in the reproductive cycle of Pampus argenteus.","authors":"Yi Wang, Changyuan Wang, Tingqian Guo, Chang Li, Kai Zhang, Xubo Wang, Shanliang Xu, Danli Wang, Chunyang Guo","doi":"10.1111/jfb.70053","DOIUrl":"https://doi.org/10.1111/jfb.70053","url":null,"abstract":"<p><p>As a member of the bone morphogenetic protein (BMP) family, Bmp4 plays a crucial role in bone formation, early developmental stage and the regulation of gonadal development. This study aims to investigate the expression patterns and potential functions of the Bmp4 in Pampus argenteus during its reproductive cycle. A systematic evolutionary analysis of the Bmp4 was performed, and its expression was quantified and localized using real-time polymerase chain reaction (PCR), Western blotting and immunohistochemistry. Additionally, the effects of various hormones on hormone-related genes were analysed in vitro using cultured testes, ovaries and oocytes. The results revealed that Bmp4 is evolutionarily conserved and broadly expressed across tissues. Notably, its expression significantly increased at 4 and 13 days post-hatching (dph), with no significant differences observed at other developmental stages. Western blotting identified a specific Bmp4 target band in Stage III ovaries, and immunohistochemistry localized Bmp4 expression in oogonia, oocytes and spermatogonia. In vitro hormonal treatments demonstrated that oestradiol (E2) significantly upregulated bmp4 expression in both testes and ovaries, with expression levels being notably higher in ovaries. In immature vitellogenic oocytes cultured in vitro, sex hormone treatments did not significantly affect the expression of bmp4, lhr, fshr and lhβ. However, under LH + hCG treatment (50 ng/mL and 5 IU/mL), the expression of fshβ was upregulated. In summary, our findings reveal that Bmp4 serves as a pivotal factor in the early development of the gonads and germ cells in P. argenteus. The expression of Bmp4 within the ovary is likely regulated by E2. During the early-stage development of the ovary, E2 and Bmp4 may jointly promote the early-stage development and differentiation of germ cells. This study offers a valuable theoretical foundation for addressing challenges in the breeding process.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143969063","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":"Genetic diversity in the American elephantfish (Chimaeriformes: Callorhinchus callorynchus) and among its congeners.","authors":"Cornelia P Erk, Francisco J Concha, Cynthia Awruch, Brittany Finucci, Franco Cristiani, Ana B Guzmán-Castellanos, Charlene da Silva, Ana Veríssimo","doi":"10.1111/jfb.70073","DOIUrl":"https://doi.org/10.1111/jfb.70073","url":null,"abstract":"<p><p>Understanding genetic population structure and connectivity is essential for effective species-specific management and conservation strategies. The American elephantfish Callorhinchus callorynchus is targeted and retained as incidental catch in commercial and recreational fisheries in Chile and Argentina. Its wide-ranging distribution across southern South America may require transnational co-operation to ensure sustainable use, but its current population structure is not known. In this work, we analysed the levels of genetic diversity and differentiation within C. callorynchus in South America using two mitochondrial markers, the control region (CR) and the cytochrome oxidase subunit I gene (CO1). Moreover, we assessed levels of genetic diversity within, and divergence among, the three extant callorhinchids (genus Callorhinchus), a group that exhibits allopatric geographical distributions in the southern hemisphere. Overall, sequence analyses of the mitochondrial CR and the CO1 revealed extremely low levels of sequence variation both within and among Callorhinchus species. Genetic homogeneity was found throughout the range of C. callorynchus coupled to low-frequency haplotype sharing across spatially distant locations in Chile and Argentina, suggesting gene flow along the South American coast. Moreover, our analyses supported a scenario of recent population expansion of the species in South America. Given the absence of dispersive eggs or juvenile stages in chondrichthyans, gene flow is mainly mediated by actively swimming adults. Based on the available data, gene flow in callorhinchids appears to occur along continuous coastal regions, with deep oceanic waters serving as strong barriers. Findings here provide an important baseline for future research on dispersal and gene flow in holocephalans.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144022756","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":"The effect of early life thermal environment on morphology and growth of yellow perch (Perca flavescens).","authors":"Shamaila Fraz, W Andrew Thompson, Milena S Gallucci, Mariam Afridi, Mellissa Easwaramoorthy, Peyton Hartenstein, Lisa Laframboise, Ian Dworkin, Richard Manzon, Christopher M Somers, Joanna Y Wilson","doi":"10.1111/jfb.70066","DOIUrl":"https://doi.org/10.1111/jfb.70066","url":null,"abstract":"<p><p>Early life development in fishes is a period of high phenotypic plasticity. Water temperatures during embryogenesis can lead to alterations in growth and metabolic and morphological phenotypic variations. This study aimed to characterize the effects of temperature on the growth and morphology of yellow perch throughout early development, a species of significant ecological and economic importance in North America. Yellow perch (Perca flavescens) embryos were incubated at either constant temperature (12, 15, or 18°C) or under an ambient seasonal regime, where temperature increased throughout embryogenesis until it reached 18°C. All groups were gradually warmed at hatch until they reached 18°C, and morphology was assessed. Inverse relationships between temperature, length and yolk-sac volume were found at the end of the embryonic period. Optimal embryonic growth was associated with the ambient seasonal regime. Fish reared at 15 or 18°C were larger and had higher growth rates when compared to those at 12°C following hatch. However, fish reared in cooler temperatures may possess more advantageous body shapes. Surprisingly, the ambient seasonal incubation had the lowest growth rate post-hatch, even though this most closely mimicked natural incubation for this species. Because suitable larval morphology is related to survival and successful recruitment, these data suggest that yellow perch may be vulnerable to climate change and thermal pollution, although further work is needed to better predict the ecological implications of the phenotypes.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144022275","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":"Branchial localization of acid (A-type) and base (B-type) excreting ionocytes in Amazonian stenohaline freshwater Potamotrygon ray.","authors":"M W Rossi, C M Wood, A L Val, J M Wilson","doi":"10.1111/jfb.70060","DOIUrl":"https://doi.org/10.1111/jfb.70060","url":null,"abstract":"<p><p>The branchial epithelium of Potamotrygon-a member of the only strictly freshwater elasmobranch family Potamotrygonidae-was observed via immunohistochemistry, and two distinct forms of ionocytes were identified. The acid (A-type) and base (B-type) secreting cells with respective basolateral-apical localizations of Na⁺/K⁺-ATPase-Na⁺/H⁺ exchanger 3 in A-type and V-type H⁺-ATPase-pendrin Cl^-/HCO₃ ^- exchanger in B-type were detected and morphometric changes in response to acid-base disturbances (3 mmol/kg body mass acid [HCl] or base load [NaHCO₃] by intraperitoneal injection) were characterized. A-type cells were found in distinct follicular clusters in the interlamellar region, while B-type cells were found individually in both the filament and lamellar epithelia. Lamellar B-type cells were more abundant and larger, with greater fluorescence than their filament counterparts. The B-type cells responded to the base load by increasing in number in the filament and showed a more peripheral H⁺-ATPase distribution, indicative of activation by translocation to the basolateral membrane labyrinth. A-type cells decreased in size with the base load. In contrast, no changes in A-type or B-type cells were observed with the acid load compared to the sham group. Together, these results indicate that the stenohaline Potamotrygon rays have branchial ion uptake cells that allow them to effectively ionoregulate under the challenging ion-poor water conditions of the Amazon.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143999073","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":"Body size of male Atlantic salmon (Salmo salar L.) at introduction of a 5-week LD12:12 winter signal influences their decision to mature early or smoltify.","authors":"Enrique Pino-Martinez, Kristine F Staveland, Mitchell S Fleming, Pablo Balseiro, Cindy Pedrosa, Sigurd O Handeland","doi":"10.1111/jfb.70068","DOIUrl":"https://doi.org/10.1111/jfb.70068","url":null,"abstract":"<p><p>Sexual maturation of male Atlantic salmon post-smolts ('jacking') is undesired in aquaculture and seems to occur due to the intensification in modern facilities. Maturation depends on internal and external factors (temperature, photoperiod, feed availability, energy levels, body size, genetic background) that act on the brain-pituitary-gonad axis to trigger maturation. This study assessed the influence that the body weight at the time of the photoperiod manipulation performed to induce smoltification can have on early maturation or smoltification. For that, 900 parr (41.3 ± 3.7 g) were assigned to four size-photoperiod treatments: constant light (LL), a winter signal (5-week LD12:12) starting when fish was 70.0 ± 8.4 g (70WS), a similar winter signal at 114 ± 9.9 g (110WS) and at 182.9 ± 35.7 g (180WS). The trial took place in fresh water, except for the last 2 weeks in each treatment carried out in full seawater. Body weight and condition, gonadosomatic index and proportion of maturing males, gill Na⁺, K⁺, ATPase activity and blood parameters (chloride and sodium, cortisol, glucose and cholesterol) were measured to assess progression of smoltification or maturation. In addition, pituitary messenger RNA (mRNA) transcription of tshβb (a paralog of the thyrotropin thyroid-stimulating hormone) was analysed to investigate its potential role in the regulation of any of the two processes. Results evidenced that body size of male salmon was relevant for the developmental response to a winter signal, be it maturation or smoltification. An early winter signal (70WS and 110WS) induced clearer signs of smoltification (reduced condition factor, high energy mobilization and little stress response in seawater among others) and no tendency to mature early. In contrast, a late or no winter signal (180WS and LL) induced a strong stress response in seawater, poor morphological signs of smolting and energy mobilization, and a higher tendency to mature early. It was difficult to directly relate pituitary tshβb transcription with both smoltification or maturation, because this gene seemed to act primarily as a timekeeper displaying large upregulations in response to increases in daylength (irrespective of size) but no changes under constant light. These results evidence that an increase in daylength when salmon is large enough to have developed sufficiently or accrued energy resources may pose high risk that a proportion of them prioritize sexual maturation over smoltification. Producers may take this into consideration when optimizing protocols for post-smolt production.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143969614","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":"Prematuration differences in male and female Atlantic cod: Investigating sex ratio, length and ecotype disparities in juveniles.","authors":"Sander Vollmerhaus Digre, Per Erik Jorde, Arild Folkvord, Jakob Hemmer-Hansen, Halvor Knutsen","doi":"10.1111/jfb.70070","DOIUrl":"https://doi.org/10.1111/jfb.70070","url":null,"abstract":"<p><p>Sexual size dimorphism (SSD) and skewed sex ratios are common in the animal kingdom, and marine fishes, such as the Atlantic cod (Gadus morhua), are no exception. This study utilized newly discovered sex-linked genetic markers to investigate young-of-the-year cod in the Skagerrak system, comprising approximately 2700 individuals from North Sea and fjord ecotypes. Overall, no significant difference in sex ratio was observed overall (51% females, 49% males), with consistent findings across 14 locations and three sheltering degrees. Although slightly more females were found in exposed areas, and slightly more males in sheltered regions, these differences were not significant. Size variation between female and male cod was generally negligible. These results indicate a likely purely genetic sex determination system in Atlantic cod and a lack of prematuration growth differences between sexes. This research enhances our understanding of the Atlantic cod, providing more insight into the Atlantic cod population in the Skagerrak and emphasizing the importance of genetic factors in sex determination.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144021685","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":"On the type locality of the Naso Stardrum Stellifer naso (Jordan 1889), and comments on morphological change over a century.","authors":"Jonas Andrade-Santos, Marcelo R Britto","doi":"10.1111/jfb.70072","DOIUrl":"https://doi.org/10.1111/jfb.70072","url":null,"abstract":"<p><p>Stellifer naso is known from the State of Bahia (Brazil), but there is a lack of an accurate definition of its type locality. Thayer's expedition (around 1865-1866), led by Louis Agassiz and staff from the Museum of Comparative Zoology (MCZ, Harvard University), intended to explore Brazilian fauna and flora, with most of its material housed in the MCZ and used to describe several species, including S. naso. Examination of specimens from the original description of that species, housed in the MCZ and the Smithsonian National Museum of Natural History, helped review the accurate point of origin for such specimens. A combination of data from reproductive biology and the history of the region further support the actual type locality of S. naso as Iguape Bay, with an error radius of 2.5 km. Damming in the Paraguaçu River in the early 1980s might have had an impact on the morphological variation over time recorded to this species.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144023379","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":"Movement behaviours of stocked and wild lake trout Salvelinus namaycush determined using acoustic telemetry.","authors":"Matthew H Futia, J Ellen Marsden","doi":"10.1111/jfb.70071","DOIUrl":"https://doi.org/10.1111/jfb.70071","url":null,"abstract":"<p><p>Hatchery practices are a critical tool of fisheries management to supplement diminished fish populations and restore extirpated species. However, stocking programs that successfully restore self-sustaining populations are rare. Unintentional artificial selection and domestication of hatchery-reared fish are potential limitations to the success of stocked individuals by selecting for behaviours that are poorly suited for natural conditions. Here, we compared seasonal movement behaviours between an established population of hatchery origin (stocked) and naturally produced (wild) lake trout (Salvelinus namaycush) in Lake Champlain at a range of sizes, including immature and mature fish. Fifty-six stocked and 34 wild lake trout were implanted with acoustic transmitters, including 45 transmitters with temperature and pressure (depth) sensors, to evaluate three-dimensional movement. Movement behaviours were assessed based on the number of distinct lake regions used, proportional time spent among lake regions, average daily distance travelled and depth distribution. Overall, horizontal and vertical movements were similar between stocked and wild lake trout across sizes, although individuals tended to occupy shallower depths at larger sizes. Seasonal differences in movement behaviours were observed and in some cases were dependent on origin. For all lake trout, average daily movement was greatest during fall and least during summer. Depth occupied, however, had an opposite trend, with the deepest average depths during summer and shallowest during fall and winter. The proportion of time spent among lake regions and variability in depth occupied also varied seasonally but only for wild fish, and included less time spent in individual regions and greater depth variability during fall compared to other seasons. While origin had insignificant effects in most models we evaluated, model predictions consistently suggested stocked lake trout had slightly smaller movements than wild fish. These results suggest that hatchery practices may have long-term, unintended effects on fish behaviour yet overall differences are likely subtle.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144010861","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}