Journal of fish biology最新文献

{"title":"Plastic contamination in fish digestive tracts in Amazonian rivers during a period of extreme low water.","authors":"Arvo Tuvikene, Helen Agasild, Adalberto Luis Val, Marina Haldna, Priit Zingel","doi":"10.1111/jfb.70021","DOIUrl":"https://doi.org/10.1111/jfb.70021","url":null,"abstract":"<p><p>Microplastics (MPs) are frequently detected in the gastrointestinal tracts of aquatic organisms worldwide. We studied the contamination with plastic in an aquatic environment and in the gastrointestinal tracts of fish in two Amazonian rivers waters, Rio Negro and Rio Solimões. The research was conducted in November/December 2023 during the low water season in a year of drastically decreased water level. We evaluated the abundance, shape, type, size as well as polymer type of the MPs and compared the contamination between fish species and feeding types. The amounts of MPs in the water were 0.25 ± 0.05 and 0.78 ± 0.19 pcs/L in the Prato canal and Vila do Janauacá, respectively. In total, 128 fish individuals belonging to different feeding types (piscivorous, planktivorous, herbivorous, invertivorous, detritivorous, omnivorous) were analysed in this study, with 84.0% and 87.4% of fish containing MPs caught from the Prato canal and Vila do Janauacá, respectively. We found no statistical relationship between the length/weight of the fish and the amount of MPs or the sizes of the plastic parts. MPs with dimensions of 0.04-5.0 mm were found in the digestive tracts of fish. There was an average of 3.3 ± 2.9 and 2.8 ± 2.1 plastic particles per fish in the study sites of the Prato canal and Vila do Janauacá, respectively. There was a statistical difference in the size of the MPs between the river sites that was correspondingly reflected in fish. In the digestive tracts of Solimões fish, plastics were on average larger than in the Rio Negro study site. At the Vila do Janauacá study site, predatory fish had the most MPs in their digestive system, while in the Prato canal, plankton-eating fish had the most MPs. Regarding the shape of MPs ingested by fishes, most were filaments, followed by fragments. The majority of the fibres were determined to be polyamide (nylon), polyethylene terephthalate and polypropylene. Our results indicate that even the remote aquatic environments may be impacted with intensive MP infestation. At the same time, with higher rainfall and higher water levels, a higher concentration of MPs is expected and this, in turn, can lead to greater contamination of fish with MPs. It has been observed that when water has a higher plastic content, more MPs end up in fish, especially in visual foragers.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710030","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":"Life history of sprat (Sprattus sprattus) in the Black Sea under warming and fishing: current state and patterns of variability.","authors":"Dmitry Kutsyn","doi":"10.1111/jfb.70026","DOIUrl":"https://doi.org/10.1111/jfb.70026","url":null,"abstract":"<p><p>Sprat Sprattus sprattus (Linnaeus, 1758) is one of the most significant commercial fish species in the Black Sea. This study examines the sex ratio, size-age structure, growth, and mortality of sprat in the waters of Crimea from 2021 to 2023. The paper discusses the geographic variability and the influence of temperature, food availability, and fishing pressure on the life history of this species. In total, 2113 individuals from commercial catches were examined. The sex ratio was slightly skewed towards females (1:0.83). The maximum total length for both males and females was 10.0 cm, with a maximum weight of 8.51 g for females and 6.73 g for males. The lifespan for both sexes was 4 years. The Bertalanffy growth equation parameters were calculated, with L_∞ = 13.79 cm, W_∞ = 16.3 g, K = 0.237 year^-1 and t₀ = -1.53 year. The exponent value in the length-weight relationship was 3.14 (positive allometric relationship). The total, natural and fishing mortality coefficients for both sexes were 2.13, 0.65 and 1.48 year^-1, respectively, and the exploitation ratio was 0.70, indicating excessive fishing pressure. It was determined that sprat from lower latitudes had smaller sizes, slower growth rates and shorter lifespans compared to sprat from higher latitudes. A strong negative correlation was found between the size and lifespan of sprat and sea surface temperature. Excessive fishing pressure against the backdrop of climate warming was identified as the cause of the reduction in lifespan and size of sprat in the Black Sea, therefore it is recommended to reduce the volume of sprat fishing and increase its minimum landing size to preserve the population of sprat in the Black Sea.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143700574","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":"Modelling fishing-induced evolution in pikeperch (Sander lucioperca) and vendace (Coregonus albula), Lake Oulujärvi, as template for ecosystem model.","authors":"Eevi Kokkonen, Tommi Perälä, Laura S Härkönen, Pekka Hyvärinen, Anna Kuparinen","doi":"10.1111/jfb.70028","DOIUrl":"https://doi.org/10.1111/jfb.70028","url":null,"abstract":"<p><p>Fishing-induced evolution can impact fish trait distributions, with previous studies highlighting declines in size and age at maturation. However, the effects on fish growth remain less understood, and different fishing methods may exert distinct selection pressures on populations. This study explores the impact of gillnetting on pikeperch (Sander lucioperca, Percidae) and trawling on vendace (Coregonus albula, Coregonidae) modelled using data-based normally distributed selection curves and the Allometric Trophic Network with Evolution model (Perälä & Kuparinen). Simulating evolutionary changes caused by fishing, we specifically examined the parameters of the von Bertalanffy model, including asymptotic length <math> <semantics> <mrow> <mfenced><msup><mi>L</mi> <mi>∞</mi></msup> </mfenced> </mrow> <annotation>$$ left({L}^{infty}right) $$</annotation></semantics> </math> and Brody's growth coefficient <math> <semantics> <mrow><mfenced><mi>k</mi></mfenced> </mrow> <annotation>$$ (k) $$</annotation></semantics> </math> . In the model we simulated a negative correlation (-0.7) between asymptotic length and Brody's growth coefficient. We investigated the effects of parameters related to genotypic and phenotypic variance and the amount of correlation between asymptotic length and Brody's growth coefficient in the model using sensitivity tests. Trawling induces evolution in C. albula towards smaller asymptotic length, whereas Brody's growth coefficient stays at intermediate levels. The results for C. albula were consistent across different levels of correlation. Gillnetting of S. lucioperca results in evolution in asymptotic length and Brody's growth coefficient in variable directions. Frequently, S. lucioperca evolved towards larger size and growth, but depending on parametrization, selection can also be disruptive, or S. lucioperca may evolve towards smaller size and growth. The amount of genotypic and phenotypic variance also influences these outcomes, whereas instantaneous fishing mortality impacts biomasses across the food web. This study underscores the significance of considering fishing-induced evolution, its impact on fish growth and food web-level effects, in addition to the densities of targeted species. Such insights are crucial for a comprehensive understanding of the ecological consequences of fishing practices.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143692243","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":"Nitrogen excretion and oxygen consumption under severe hypoxia in siluriform fishes from the Amazon.","authors":"Bernd Pelster, Chris M Wood, Adalberto Luis Val","doi":"10.1111/jfb.70022","DOIUrl":"https://doi.org/10.1111/jfb.70022","url":null,"abstract":"<p><p>Siluriform fishes collected from the Rio Negro and Rio Solimões proved to be highly resistant to aquatic hypoxia. In all four species analysed in this study, aquatic oxygen consumption significantly decreased from normoxic levels at water PO₂ values near 1 kPa. Air-breathing activity was observed only in Sturisoma sp. (Rio Negro). In this species, under severe hypoxia, oxygen uptake from the air dominated, but total oxygen uptake was significantly lower than that under normoxic conditions. In Anadoras weddellii (Rio Solimões), aquatic surface respiration was detected. However, the other species (Tympanopleura atronasus and three members of the family of Sternopygidae; Rio Solimões) showed no attempt to supplement aquatic oxygen uptake, even under severe hypoxia. In all species tested, neither ammonia nor urea-N excretion was affected by the decreasing water PO₂. At the lowest water PO₂ levels, the reduction in total oxygen uptake in the face of unchanged nitrogenous waste excretion resulted in extraordinary high nitrogen quotient (NQ) ratios. In normoxia, NQ ratios ranged from 0.16 to 0.34. Urea-N excretion contributed between 19% and 28% to total nitrogen excretion and appeared to be unrelated to natural diet as indicated by the gut length-to-fork length ratio or to plasma urea-N levels. Overall, our data underline the quantitative importance of urea-N for nitrogen excretion in siluriform fishes.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143633854","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":"Overwinter survival of an estuarine resident fish (Fundulus heteroclitus) in North Carolina salt marsh creeks.","authors":"Paul Joseph Rudershausen, Matthew J O'Donnell","doi":"10.1111/jfb.70020","DOIUrl":"https://doi.org/10.1111/jfb.70020","url":null,"abstract":"<p><p>The mummichog Fundulus heteroclitus is a trophically important fish inhabiting Atlantic coastal salt marshes, with few in situ estimates of overwinter survival throughout the species range. We estimated overwinter apparent survival rates of F. heteroclitus at the approximate mid-latitudinal species range [coastal North Carolina (USA)] in four tidal creeks that experience variable winter water temperatures. To estimate apparent survival, we fitted a Cormack-Jolly-Seber model to daily mark-resight data autonomously obtained from fish marked with passive integrated transponder tags. Creek, year, mean daily water temperature, change in mean daily temperature, fish length and fish condition were considered for effects on the modelled parameters: apparent survival (Φ) (product of true survival and site fidelity) and detection probability (p). Modelling showed that water temperature and fish metrics were not related to Φ. Water temperature was directly related to p, indicating reduced fish activity and thus reduced detection probability or poor antenna detection performance at low temperatures. Creek was related to Φ and p, and the creek most open to its downstream estuary (lacking a culvert) had lower rates than the others. Greater loss (fish mortality plus emigration) in this one creek may more effectively transfer production of F. heteroclitus to larger waterbodies via emigration or predation. Conversely, lower Φ may reflect reduced detection efficiency. The results suggest that F. heteroclitus survival is insensitive to variable winter water temperatures typical of thermal dynamics in shallow estuaries in this region of its range. Median creek-specific overwinter Φ rates (range of median values, 2 × 10^-8, 0.04) were roughly equal to previously published rates for these creeks during the growing season (April-October). At these latitudes and with increasingly moderate winters, the results indicate that natural mortality could arise equally or more so from predation during the growing season than mechanisms such as starvation, direct mortality, thermal morbidity and stress-related susceptibility to predation resulting from intermittently low water temperatures during the overwinter season.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143624845","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":"Effects of enrofloxacin and povidone-iodine on immunity, the intestinal microbiome and transcriptome of juvenile grass carp (Ctenopharyngodon idella).","authors":"Zhilong Chen, Lixin Ma, Sien Chen, Yao Huang, Zhendong Qin, Li Lin, Fei Shi","doi":"10.1111/jfb.70018","DOIUrl":"https://doi.org/10.1111/jfb.70018","url":null,"abstract":"<p><p>Gut microbiota stability is crucial for maintaining fish health. In aquaculture, antibiotics and disinfectants are frequently used to manipulate the host gut microbiota, but the combined effects on asymptomatic fish remain unclear. We investigated the effects of single and combined treatments with antibiotics and disinfectants on grass carp (Ctenopharyngodon idella) gut health, immune response, microbiome dynamics and transcriptome profile. In a 2-week trial, grass carp were exposed to enrofloxacin (10 mg/kg) in the basal diet or povidone-iodine (0.05 mg/L) in fresh water. A 14-day treatment led to significant oxidative stress, as indicated by reduced catalase and total superoxide dismutase activities. Digestive enzyme activities, including amylase and lipase, were also significantly suppressed. Gut microbiota diversity decreased, with notable shifts in dominant bacterial phyla, including reduced abundances of Firmicutes and Bacteroidetes and increased Proteobacteria and Fusobacteria. Transcriptomic analysis revealed downregulation of immune-related pathways, including those linked to IgA production, and suppression of key immune-related genes, such as major histocompatibility complex 2 (MHC2) and tumour necrosis factor alpha (TNF-α). Histopathological analysis showed damaged intestinal villi, increased goblet cell numbers and significant apoptosis in intestinal epithelial cells, as confirmed by terminal deoxynucleotidyl transferase (TdT) dUTP Nick-End Labeling (TUNEL) staining and upregulation of caspase-3, caspase-8 and caspase-9. These findings demonstrate that enrofloxacin and povidone-iodine disrupt gut microbiota balance, impair mucosal immunity and induce apoptosis in grass carp.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143624838","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":"Mass stranding of common (weedy) seadragons (Phyllopteryx taeniolatus) in Sydney: impacts and implications.","authors":"David J Booth, Andrew Trevor-Jones, Selma Klanten, Giglia A Beretta","doi":"10.1111/jfb.70019","DOIUrl":"https://doi.org/10.1111/jfb.70019","url":null,"abstract":"<p><p>In April 2022, mass stranding of weedy (common) seadragons occurred, with a total of over 200 individuals washed ashore on beaches in the Sydney, Australia region, recorded by citizens. Causes of the stranding, which is unprecedented, were likely related to a series of east coast low storm events, leading to record wave heights, record coastal rainfall, and potential loss of critical food sources (schooling mysid crustaceans). A significant proportion of the local population was likely lost in this series of events, indicating a future threat to seadragons, with east coast low intensity predicted to increase under human-caused climate change.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143624842","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":"Otolith ageing of white seabass (Atractoscion nobilis): Known-age validation, reader performance and sex-specific growth patterns.","authors":"Michael A Shane, Ruairi MacNamara, Lyall F Bellquist, Mark A Drawbridge","doi":"10.1111/jfb.70016","DOIUrl":"https://doi.org/10.1111/jfb.70016","url":null,"abstract":"<p><p>The sciaenid white seabass (Atractoscion nobilis) is stocked in California (U.S.) where it supports commercial and recreational marine fisheries. Despite its importance, age and growth remains incompletely understood (e.g., differences between females and males) and has not been validated using known-age fish. In this study, the sectioned sagittal otoliths of 196 hatchery-reared white seabass were analysed. These known-age fish, recaptured after up to 14 years at liberty, allowed reader age interpretation to be validated and reader performance to be quantified. Reader age was not biased relative to true age in hatchery-reared fish, and among-reader precision was high [74.5% agreement, 5.1% average coefficient of variation (ACV)]. Otoliths from wild white seabass were subsequently analysed to develop sex-specific von Bertalanffy growth models, showing that females (age 0-24, n = 355) grow faster and are older than males (age 0-15, n = 381). Otolith morphometric-true age regressions were developed from an expanded dataset of 365 hatchery-reared white seabass to assess an alternative age determination technique for wild conspecifics. Relative to reader age interpretation, age predicted from otolith morphometrics (weight, length, width and thickness) had highly variable agreement (9.5%-68.8%) and ACV (9.5%-44.2%), depending on the age range examined. This study is the first to provide validated, sex-specific age and growth for this moderately long-lived marine fish species, and demonstrates how stocking programmes can serve as an ecological tool to help manage wild populations.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143615389","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":"Morphological covariates of the ontogenetic shift from nauplii to copepodite prey in larval fish.","authors":"Pierre Pepin","doi":"10.1111/jfb.70014","DOIUrl":"https://doi.org/10.1111/jfb.70014","url":null,"abstract":"<p><p>Larval fish are active planktonic predators, with many species feeding initially on copepod nauplii and gradually shifting their selection to copepodites. This study evaluated whether it is possible to develop a general widely applicable empirical model to describe the transition from feeding on copepod nauplii to copepodites in relation to body length, maxilla length and eye diameter. The study also evaluated whether the switch to copepodites is linked to what prey are in the stomach or which copepodite species are replacing nauplii in the diet was also considered. The high degree of covariation among the three morphometric variables makes it difficult to establish statistical differences among predictive models. However, the highest overall fit to a logistic model and accuracy in the transition from nauplii to copepodites are achieved when eye diameter is used as a predictive variable. There are also fewer significant differences in the residuals among fish taxa in the case of eye diameter relative to the other morphometric variables. Fish taxa that shift their diet from copepod nauplii to prey on cyclopoid copepodites demonstrate a slower ontogenetic transition away from nauplii than taxa that shift to calanoid copepodites. Eye diameter may be a stronger predictor of the shift in diet because it contributes to most of the processes that make up the foraging sequence of larval fish prey-predator interactions.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605117","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":"Defining the water flow cues for navigation in migrating Atlantic salmon smolts.","authors":"Mikolaj E Kundegorski, Hannele M Honkanen, Alastair Stephen, Colin J Torney, Shaun Killen, Colin E Adams","doi":"10.1111/jfb.70004","DOIUrl":"https://doi.org/10.1111/jfb.70004","url":null,"abstract":"<p><p>For migratory species, successful navigation is critical to fitness. In Atlantic salmon, for example, there is evidence that during migration from natal streams to the sea, passage through waters with poorly defined or mixed water velocity patterns may constrain directional navigation, causing individuals to become trapped or delayed in lakes or other bodies with slowly flowing water. In this study, we determined the minimum water velocities needed to elicit a behavioural response, in this case a change in the direction of holding position, in both wild origin and domesticated salmon smolts. Smolts required a directional flow in excess of 8.9 cm s^-1 to exhibit effective directional orientation towards the current. Smolts of a domesticated farm origin exhibited a similar qualitative and quantitative response as wild fish. These results suggest that, in areas where the downstream migrating Atlantic salmon smolts pass through low-directional water flow, it may be possible to manipulate directional flows above this minimum threshold, at least temporarily, as a management tool to increase migration success. This is likely to be particularly true where smolts are passing through dams, reservoirs or other impounded waters.</p>","PeriodicalId":15794,"journal":{"name":"Journal of fish biology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605113","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}