Journal of fish biology最新文献

{"title":"Morphological and functional analysis of saccus vasculosus of mandarin fish (Siniperca chuatsi).","authors":"Rahma Sakina Said Aly, Jiajie Fang, Keying Li, Xiao Ma, Jiong Gao, Meng Zhang, Xiaowu Chen, Yawei Shen","doi":"10.1111/jfb.70232","DOIUrl":"https://doi.org/10.1111/jfb.70232","url":null,"abstract":"<p><p>The saccus vasculosus (SV) is a specialized periventricular organ found in some species of teleost and elasmobranch fishes, located at the back of the hypothalamus and pituitary gland. However, its function remains incompletely understood. In this study, histological, transmission electron microscopy (TEM) and transcriptomic analyses were employed to investigate the SV of the mandarin fish (Siniperca chuatsi) to gain insights into its morphology, gene expression profile and function. Through histological staining techniques, different cell types within the SV can be identified and characterized. The SV is highly folded vascularized neuroepithelium and is deeply connected to blood vessels. TEM studies showed that the capillaries that produced the lumen formed complex narrow channels are linked to the third ventricle of the hypothalamus. The bright neuroepithelium is formed by coronet cells and supporting glial cells, interspersed with liquor-containing neurons, while the dark contrast is attributed to the presence of heavy elements such as calcium. We identified 28 specific genes in SV, which are most enriched in the purine metabolism pathway, including the genes of pde9al, pde9ac, pde6hl and sgc88el. Gene Ontology biological process analysis for the SV-specific genes showed that response to osmotic stress was the hub term according to the enrichment maps. Additionally, SV-specific genes opsin (opsin8b), photoreceptor (pcare1) and aquaporin (aqp4, aqp9l) of Siniperca chuatsi may indicate that they play a role as a sensor of season and are involved in osmoregulation. This study, the first on the Siniperca chuatsi, suggests that the SV may have unique physiological functions in teleost fish.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145091853","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":"Etmopterus westraliensis, a new species of lanternshark (Squaliformes: Etmopteridae) from Western Australia, with redescription of Etmopterus brachyurus.","authors":"Shing-Lai Ng, William T White, Kwang-Ming Liu, Shoou-Jeng Joung","doi":"10.1111/jfb.70162","DOIUrl":"https://doi.org/10.1111/jfb.70162","url":null,"abstract":"<p><p>Etmopterus westraliensis is described as a new species based on six specimens collected from Western Australia, eastern Indian Ocean. The new species is assigned to the Etmopterus lucifer group due to its slender, elongate anterior and posterior branches of the flank markings. It shares the following combination of morphological characters with two congeners, Etmopterus brachyurus and Etmopterus samadiae: dermal denticles hook-like, a naked area present on underside of snout, denticles present on dorsal fins in mature individuals, the origin of flank-marking base anterior to a vertical line through origin of the second dorsal fin, caudal-fin base marking thin and slender and a relatively short posterior caudal-fin marking. The new species differs from E. brachyurus in having a longer caudal-fin base marking, ventral portion of caudal-fin base marking much longer than wide, and differs from E. samadiae in having a longer mouth, different shape of the naked area on underside of snout, thinner posterior branch of flank marking, caudal-fin base marking tip tapering and more monospondylous centra. The new species is also distinguished from E. brachyurus and E. samadiae by the mean genetic distance for the NADH2 gene, that is, 0.028 and 0.040, respectively. E. brachyurus is redescribed here based on the holotype together with additional specimens collected from the northwestern Pacific.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145086186","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":"Transcriptomic study of muscle in response to heat in Triplophysa yarkandensis.","authors":"Xiyao Wang, Shengao Chen, Yaoyao Li, Haiguang Zhang, Dong Cui, Yimeng Liu, Yunguo Liu","doi":"10.1111/jfb.70184","DOIUrl":"https://doi.org/10.1111/jfb.70184","url":null,"abstract":"<p><p>Triplophysa yarkandensis is an economically important fish species native to the Tarim River of Xinjiang, China. Amid ongoing climate warming and rising temperatures in the Tarim River, T. yarkandensis has demonstrated a degree of physiological adaptation to heat stress. However, the underlying mechanisms of this thermal adaptation and the impact of high-temperature stress on gene expression profiles remain poorly understood. Investigating its heat tolerance genes can aid in protecting wild populations from the threat of endangerment due to ecological damage. Based on the optimal growth temperature and maximum heat tolerance of T. yarkandensis, 20°C was used as the normal temperature control group (NT20), while 27 and 34°C served as the heat treatment groups (HT27 and HT34). In this study, 9544 differentially expressed genes (DEGs) were identified, comprising 4823 upregulated and 4861 downregulated genes in muscle tissue. Several heat-related genes, such as hspa5, hsp70, hyou1, hsp40, atp2a and cacna1a, were identified. These genes were primarily enriched in pathways such as spinocerebellar ataxia, protein processing in endoplasmic reticulum and the legionellosis signalling pathway. Quantitative real-time PCR analysis was employed to verify the significantly expressed DEGs, and the results aligned with the trends observed in transcriptome analysis. Key genes including ire1, traf2, map3k5, map2k7, jnk, bax, bcl2 and capn1 enriched in protein processing in endoplasmic reticulum were quantitatively analysed. In this study, we employed transcriptomic analysis combined with bioinformatics approaches to explore the molecular responses of T. yarkandensis under heat stress. The findings contribute to the conservation of its germplasm resources, support the breeding of heat-tolerant strains, and provide a scientific basis for artificial propagation and stock enhancement efforts.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145086225","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":"Review of the southern African slender stonebashers, genus Heteromormyrus Steindachner 1866 (Teleostei: Mormyridae), with description of six new species.","authors":"Tadiwa I Mutizwa, Wilbert T Kadye, Pedro H N Bragança, Albert Chakona","doi":"10.1111/jfb.70191","DOIUrl":"https://doi.org/10.1111/jfb.70191","url":null,"abstract":"<p><p>Recent molecular studies have advanced our knowledge of the taxonomic diversity and generic placement of the slender stonebashers, previously placed in the genus Hippopotamyrus, in southern Africa. These fishes were recently transferred to the genus Heteromormyrus whose range encompasses the Kwanza, Kunene, Okavango, Zambezi, Pungwe and Buzi River systems in southern Africa, as well as the southern tributaries of the Congo River system. The present study builds on previous research that identified at least eight candidate species within the Heteromormyrus ansorgii species complex by providing formal descriptions for six new species and redescriptions of Heteromormyrus pauciradiatus and H. ansorgii s.s. The Kwanza River system is peculiar because it currently has five known species in this genus, some of which are co-distributed, whereas the other river systems have only one or two species in this genus. Two of the new species, Heteromormyrus dolichorhynchus sp. nov. and Heteromormyrus angusticaudata sp. nov., are endemic to the Kwanza River system. Heteromormyrus xanekweorum sp. nov. is confined to the Okavango River system, Heteromormyrus chilembwei sp. nov. occurs in the Ruo River (lower Zambezi River system), Heteromormyrus tangwenai sp. nov. is endemic to the Pungwe River system and Heteromormyrus ndauorum sp. nov. is endemic to the Buzi River system. Species in this genus exhibit high morphological similarity, but they can be separated by a combination of characters, including scale counts, dorsal- and anal-fin ray counts, vertebral counts, caudal peduncle depth, position of nostrils, head shape and variation in colour pattern. Taxonomic diversity within this genus is likely to be higher than currently known, and future studies, particularly in the Kwanza and upper Zambezi rivers, are anticipated to uncover additional new species.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145075078","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":"Uncovering the lazybones of the shark world","authors":"William Bernard Perry","doi":"10.1111/jfb.70230","DOIUrl":"10.1111/jfb.70230","url":null,"abstract":"&lt;p&gt;Our ability to reconstruct the biology of organisms from inanimate objects has a magical quality to it – be it their ecology, physiology or behaviour. I think this partially explains the allure of dinosaurs. Palaeontologists use science, along with lifeless fossilized remains, to open windows into the past, shedding light on how these incredible creatures once lived. However, not all the fun and awe are reserved for those studying dinosaurs. Ichthyologists also wield these powerful tools, which give us unprecedented insights into the life of fish. There is, of course, the enviable group that falls in the middle of this Venn diagram who study the fish fossil record (Bell, &lt;span&gt;2009&lt;/span&gt;; Cooper et al., &lt;span&gt;2023&lt;/span&gt;; Maisey et al., &lt;span&gt;2021&lt;/span&gt;; Paillard et al., &lt;span&gt;2021&lt;/span&gt;), including celebrities like the &lt;i&gt;Otodus megalodon&lt;/i&gt; (Cooper et al., &lt;span&gt;2022&lt;/span&gt;).&lt;/p&gt;&lt;p&gt;Coming back to the present-day and extant (for now) fish species, researchers have utilized an array of hard structures in fish that act as archives to understand more about their study organism. Be that scales to determine age (Horká et al., &lt;span&gt;2010&lt;/span&gt;), otoliths and chemical analysis to determine habitat use (Antunes et al., &lt;span&gt;2025&lt;/span&gt;) or the length of consumed pectoral spines to understand the size of prey (Glade et al., &lt;span&gt;2025&lt;/span&gt;). Perhaps one of the most illuminating methodologies, however, is stable isotope analyses, which, from just an otolith or scale, can be used to infer information on location of origin (Willmes et al., &lt;span&gt;2024&lt;/span&gt;), migration (Mainguy et al., &lt;span&gt;2023&lt;/span&gt;) and feeding patterns of fish (Feeney et al., &lt;span&gt;2024&lt;/span&gt;).&lt;/p&gt;&lt;p&gt;Although teleosts by definition have a large number of calcified structures which can be used as stable isotope archives through time, these same principles can also be used on chondrichthyan skeletons, because while they are cartilaginous, vertebrae, jaws and teeth which need extra strength are commonly mineralized. Indeed, shark vertebrae have been successfully used, alongside mass spectrometry, to identify lifetime habitat use across salinity gradients (Grant et al., &lt;span&gt;2023&lt;/span&gt;).&lt;/p&gt;&lt;p&gt;In this issue, the value of chondrichthyan calcified cartilage is further explored by Díaz-Delgado et al. (&lt;span&gt;2025&lt;/span&gt;) who use stable isotopes to understand metabolic rate in 13 different species of shark, ray and chimaera. What they found is that the light isotope of carbon, which is particularly abundant in metabolic carbon sources, was more strongly included in calcified cartilage from highly active thunniform species compared to less active species. This is the same as seen in teleost otoliths, where higher metabolic rates lead to more metabolic carbon included in the otolith. The stable isotope composition of carbon in shark mineralized cartilage is reflective of metabolic rate. Because measuring metabolic rate is so difficult in large chondrichthyans like these, this metho","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":"107 3","pages":"683-684"},"PeriodicalIF":2.0,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jfb.70230","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145080981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The presence of substrate as a means of environmental enrichment does not improve the welfare of the laboratory rare minnow (Gobiocypris rarus).","authors":"Chunsen Xu, Yunwen Cui, Xinhua Zou, Fandong Yu, Miaomiao Hou, Zhijun Xia, Jianwei Wang","doi":"10.1111/jfb.70207","DOIUrl":"https://doi.org/10.1111/jfb.70207","url":null,"abstract":"<p><p>Increasing the complexity of physical structure is a common means of environmental enrichment, and it is possible to improve the welfare level of fish by improving their biological function. Although laboratory fish play an important role in the field of life sciences, their rearing environment usually does not have any enrichment measures. In this study, sand was added to the bottom of the rearing tank as the treatment group and its effect on the laboratory rare minnow (Gobiocypris rarus) was comprehensively assessed through growth, behaviour and physiological indexes. The results showed that there were no significant differences in growth, anxiety-like behaviour or dopamine, serotonin and their metabolites between the control group and the treatment group. In general, no obvious benefits were found from the presence of sand substrates, and it is not recommended as a measure to enrich the environment of the laboratory rare minnow.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081055","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":"Growth strategies across life-history stages and generational turnover of cryptobenthic coral reef fishes of the genus Trimma.","authors":"Nisha C Goldsworthy, Maya Srinivasan, Patrick Smallhorn-West, Geoffrey P Jones","doi":"10.1111/jfb.70224","DOIUrl":"https://doi.org/10.1111/jfb.70224","url":null,"abstract":"<p><p>Somatic growth influences survival and reproduction, with flow-on effects on population dynamics and energy fluxes within ecosystems. Small-bodied cryptobenthic reef fishes may contribute significantly to productivity due to their life-history traits, including growth rates and rapid generational turnover. However, comprehensive studies on growth that encompass all stages of life are rare. This study aimed to investigate growth patterns across life-history stages and generational turnover rates in three Trimma species that are abundant on coral reefs in the Pacific: Trimma benjamini, Trimma capostriatum and Trimma yanoi. The Trimma species examined exhibited small body sizes of <25 mm and short life spans of <140 days, potentially enabling them to produce over three generations annually. Three growth models were compared (Modified Fry model, Body Proportional Hypothesis, and the Biological Intercept model) to back-calculate growth at ages prior to capture, and the Body Proportional Hypothesis performed the best in each species, indicated by the lowest residual sum of squares and mean squared error of the model. Each species displayed similar growth patterns, with growth rates varying across different life-history stages. Growth was most rapid during the pelagic larval phase, averaging 0.2 mm per day. The size at settlement was small, ranging from 7.6 to 8.4 mm. Growth was initially rapid post-settlement but gradually slowed, averaging 0.16 to 0.17 mm per day during the juvenile stage. In the adult phase, growth was non-asymptotic, averaging approximately 0.15 mm per day, with 31.3%-37.0% of total growth occurring during this stage. Growth decreased by 8.6%-11.7% following maturation, which is minor compared to the patterns observed in larger fish species. These findings support the expanding literature, suggesting cryptobenthic reef fishes exhibit unique life-history traits that could be associated with their small maximum body size.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145075451","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":"Long-term shifts in pikeperch, Sander lucioperca, diet composition in a changing reservoir.","authors":"Karlos Ribeiro de Moraes, Million Tesfaye, Daniel Bartoň, Petr Blabolil, Jakub Brabec, Marek Brabec, Vladislav Draštík, Marie Prchalová, Josef Matěna, Milan Muška, Michal Tušer, Tomáš Jůza, Luboš Kočvara, Zuzana Sajdlová, Katerina Soukalová, Allan T Souza, Marek Šmejkal, Radka Symonová, Milan Říha, Mojmír Vašek, Jan Kubečka","doi":"10.1111/jfb.70225","DOIUrl":"https://doi.org/10.1111/jfb.70225","url":null,"abstract":"<p><p>As a significant piscivorous predator, the pikeperch (Sander lucioperca) plays a critical role in regulating aquatic ecosystems. Understanding its size-related feeding behaviour is thus vital for assessing its impact. To evaluate its role in the ecosystem, stomach content analysis provides useful insights into predator-prey dynamics. This study investigated the stomach content and dietary patterns of pikeperch in the Lipno Reservoir, Czech Republic, across two distinct time periods: the 1966-1970 (19's) and the 2010-2022 (20's). We analysed the stomach contents of 875 pikeperch specimens and revealed a notable shift in diet composition over time. The results demonstrated a significant decrease in overall prey consumption and a marked increase in the proportion of cyprinids in the diet, whereas the percentages of perch (Perca fluviatilis) and ruffe (Gymnocephalus cernua) decreased. Cannibalism was observed in the 20's dataset, suggesting a reduction in prey abundance in the reservoir or a shift in community structure. The predator-prey length ratio (PPR) decreased as pikeperch grew larger. The PPR values in Lipno Reservoir were lower than those reported in other studies, indicating potentially slower growth rates in this fish. Although percids were the main prey of pikeperch, the electivity index showed positive values only for pikeperch as the prey. Overall, this study highlights long-term changes in pikeperch diets, both in the numbers and species of prey and in PPR.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145075414","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":"Size at sex change in the protandric hermaphrodite Patagonian blenny Eleginops maclovinus (Cuvier, 1830) in central-southern Chile.","authors":"Andrés Flores, Rodrigo Wiff, Donald I Brown","doi":"10.1111/jfb.70231","DOIUrl":"https://doi.org/10.1111/jfb.70231","url":null,"abstract":"<p><p>Hermaphroditic fish species show low resilience to fishing exploitation, as alterations in sex ratio or size at sexual transition have direct implications for population fitness. The Patagonian blenny is a protandric hermaphrodite of economic importance in Chile, where basic knowledge of its life-history traits remains scarce. Using individuals collected from the artisanal fishery, we estimated the proportion of females at length (P_F) for this species in Chile through histological analysis, and compared our findings with those of previous studies conducted in the southeast Pacific and southwest Atlantic. A total of 301 individuals were collected during March and from July to October 2022, of which 189 gonads were submitted to histological analysis. P_F was estimated using a generalised linear model with a binomial error distribution. Histological analysis indicated that females possess a group-synchronous gonadal development, whose reproductive season occurs during autumn-winter. The sexual transitional phase occurs between 30 and 40 cm in total length (L_T). The fitted ogive of P_F did not differ significantly between macroscopic and histological methods (p > 0.05). However, temporal and spatial variations in P_F were evident when compared to previous studies conducted on both the Pacific and Atlantic sides. In Chile, this study revealed a decrease in the size at sexual transition for this species from 41.6 cm L_T in 1974-1975 to 35.7 cm L_T in 2022, highlighting the need for a monitoring system and the implementation of appropriate management measures.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069743","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":"Period of the day drives distinctions in the taxonomic and functional structures of reef fish assemblages.","authors":"Marcos B Lucena, Thiago C Mendes, Cesar A M M Cordeiro, Carlos E L Ferreira","doi":"10.1111/jfb.70228","DOIUrl":"https://doi.org/10.1111/jfb.70228","url":null,"abstract":"<p><p>Circadian processes are key drivers of animal behaviour, influencing patterns of activity, resource partitioning and competition avoidance. Studies evaluating circadian changes on the structure of marine assemblages are lacking, especially for reef fish. Evaluating the changes imposed by the day-night cycle on the structure and functioning of these assemblages is of critical importance to understand the differences between the diurnal and nocturnal components, as well as the resources they exploit, to better model and manage them. Here, we assessed the fish fauna using an underwater visual census conducted at the same sites during both day and night on a subtropical rocky reef in the Southwestern Atlantic (SWA), aiming to evaluate differences in the community and functional structure of these assemblages. A total of 242 transects were conducted across three sites, with 104 during the day and 138 at night. Fish richness, density, biomass and functional richness were higher in the diurnal period, whereas nocturnal assemblages exhibited higher taxonomic distinctiveness and functional divergence. Both richness and density of nocturnal assemblage, as well as richness and taxonomic distinctness index of the diurnal assemblage, were influenced by depth. The species in each assemblage exhibited different combinations of traits. As expected, diurnal assemblages were richer and occupied a larger proportion of the multidimensional trait space. Body size was comparatively larger for the diurnal assemblage, evidencing niche partitioning based on ontogeny. These results indicate significant differences in the structure of diurnal and nocturnal reef fish assemblages, as expected, driven by resource use, space use and predator avoidance. Fish play a central role in many key processes within reef systems, in addition to their importance for human nutrition and cultural services. Therefore, understanding the components and diversity of nocturnal assemblages is essential to address the significant knowledge gap to understand their role in reef energetics and demand proper management.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145053869","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}