Fisheries Research最新文献

{"title":"Rearing endangered atlantic salmon (Salmo salar) in modified marine aquaculture systems for population conservation in Eastern Canada","authors":"Corey N. Clarke ,&nbsp;John M. Whitelaw ,&nbsp;John W. Robinson ,&nbsp;Matthew J. Ingersoll","doi":"10.1016/j.fishres.2025.107553","DOIUrl":"10.1016/j.fishres.2025.107553","url":null,"abstract":"<div><div>We document the first known marine aquaculture farm established and dedicated to rearing wild-origin Atlantic salmon (<em>Salmo salar</em>) for population restoration. Juvenile salmon of a common lineage were collected from the wild in Fundy National Park, in Eastern Canada and reared in a captive marine environment using modified commercial aquaculture systems. Each year from 2015 to 2024, cohorts of mature fish were tagged at the marine farm and transferred by truck for release back into to the Upper Salmon River in Fundy National Park, at the time they would be naturally returning from sea to spawn the next generation. Our rearing and release strategy avoided high mortality during the marine life stage, which is the factor most limiting population recovery. Post-released adult salmon were observed returning naturally in subsequent years from 2016 to 2024. This work contributed to our objective to increase counts of returning adult salmon, which were otherwise absent from 1995 to 2007, following a population collapse. The scale of benefits from released and returning salmon require further quantification, but the current study provides a promising template for consideration and implementation by other jurisdictions that are facing futures without salmon, and the associated loss of benefits to ecosystems, community, and culture that follow.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107553"},"PeriodicalIF":2.3,"publicationDate":"2025-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integration of fisheries and ecological data to support spatial management: The case of blackspot seabream (Pagellus bogaraveo) in the western Mediterranean Sea","authors":"Diego Panzeri ,&nbsp;Juan Gil Herrera ,&nbsp;Cristina García-Ruíz ,&nbsp;Lucia Rueda ,&nbsp;Meryem Benziane ,&nbsp;Mohammed Idrissi Malouli ,&nbsp;Pilar Hernández ,&nbsp;Simone Libralato","doi":"10.1016/j.fishres.2025.107549","DOIUrl":"10.1016/j.fishres.2025.107549","url":null,"abstract":"<div><div>Spatial measures are often used to support fisheries management. The European Union, for example, has emphasized the importance of the spatial aspect to protect overfished stocks and to find a better approach to fisheries management. Nevertheless, careful selection of which marine areas to manage with greater precaution is essential to optimize their benefits. In this work, we estimated hot spots of aggregation using a species distribution model developed with template model builder (sdmTMB) on density indices (number of individuals/km²) for blackspot seabream (<em>Pagellus bogaraveo</em>) for two length ranges (&lt; = 20 cm and &gt; 20 cm). We applied the model to scientific bottom trawl surveys conducted in the Alboran Sea (western Mediterranean) and to a dataset of georeferenced commercial catches (CPUE, Catch Per Unit Effort or fishery-dependent data) in the Strait of Gibraltar. In addition, the effects of oceanographic variables on the distribution of species was tested. The identified best distributions for both length ranges are used to determine hot spots of aggregation for the two size classes from 1994 to 2021 in northern Alboran Sea, from 2018 to 2021 in southern Alboran Sea and from 2005 to 2009 in the Strait of Gibraltar area. Identified persistent hot spots (as an hotspot area across all years of the time series) represent key ecological areas for the species that might be considered in future management plans. In the Northern Alboran Sea, 5 ecologically important areas were identified for smaller size individuals and 2 for the larger sized individuals. The overlap with the current effort estimates revealed two areas (one for smaller and one for larger specimens) off Cabo de Gata and Almeria that could have significant ecological impacts with minimal socio-economic disadvantages if further protected. These could be two future management areas (e.g. Fisheries Restricted Area - FRA) that could be important for stock dynamics. The results confirm the ecological preferences of the species that were disentangled by Species Distribution Models (SDMs) as well as its useful contribution to support the management of this depleted species in the Mediterranean sea.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107549"},"PeriodicalIF":2.3,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploitation rates of Atlantic salmon and sea trout in recreational fisheries in western Norwegian rivers","authors":"Helge Skoglund ,&nbsp;Knut Wiik Vollset ,&nbsp;Marius Kambestad ,&nbsp;Robert James Lennox ,&nbsp;Bjørn Torgeir Barlaup","doi":"10.1016/j.fishres.2025.107557","DOIUrl":"10.1016/j.fishres.2025.107557","url":null,"abstract":"<div><div>Information on fish population abundance and the factors affecting fisheries exploitation rates is crucial for sustainable fisheries management. However, this knowledge is often challenging for managers to obtain. We evaluated a novel approach to this problem using data from drift diving surveys where Atlantic salmon and sea-run brown trout were counted across 63 rivers and over a period of 20 years in western Norway together with catch data to estimate exploitation rates of the two species. The average exploitation rate was 33.5 % for salmon and 13.9 % for sea trout. For both species, the exploitation rate depended on the duration of the fishing season and the management regulations imposed through catch restrictions and quotas. For salmon, the exploitation rate also varied among size groups, being greater for small (&lt; 3 kg: 35.6 %) than for large salmon (&gt; 7 kg: 31.7 %) and medium sized salmon (3–7 kg: 31.5 %). There were also indications of exploitation rates being negatively associated with fish density, at least in some rivers, raising concern that populations may be susceptible to overexploitation when densities are low. The total catch rates including catch and release were 41.6 % for salmon and 21.4 % for sea trout, and increased significantly with the proportion of released fish, suggesting that some fish may have been caught and reported several times. The study highlights the importance of population monitoring surveys for evaluating and adapting management strategies in response to the critical situation for anadromous salmonid fishes.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107557"},"PeriodicalIF":2.3,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fecundity and egg size trade-offs in Triplophysa strauchii: Reproductive adaptations in Sayram Lake","authors":"Zhengwei Wang ,&nbsp;Yinsheng Chen ,&nbsp;Yichao Hao ,&nbsp;Jinqiu Wang ,&nbsp;Shouyi Zuo ,&nbsp;Jie Wei ,&nbsp;Zhulan Nie","doi":"10.1016/j.fishres.2025.107558","DOIUrl":"10.1016/j.fishres.2025.107558","url":null,"abstract":"<div><div>Reproductive strategies of fish in alpine lake ecosystems are critical for adapting to extreme environments such as low temperatures and oligotrophy. This study investigated the reproductive characteristics of <em>T. strauchii</em>, a cold-water fish endemic to Sayram Lake in Xinjiang, by analyzing fecundity, egg diameter, and their relationships with morphological indices. A total of 131 individuals were collected in April 2025, with 57 mature female specimens at gonadal development stage IV selected for detailed analysis. Results showed that absolute fecundity (<em>F)</em> ranged from 6000 to 22,823 eggs (mean=11,202 ± 3510.24 eggs), which was significantly positively correlated with body mass, ovarian mass, and age (<em>p</em> &lt; 0.01). The 2-year-old age group dominated the reproductive population (77.19 % of individuals) and contributed 72.35 % to total fecundity, reflecting an adaptive strategy to high-altitude environments characterized by low growth rates and high mortality. Egg diameter averaged (0.67 ± 0.07) mm and exhibited a positive linear relationship with absolute fecundity (<em>y</em> = 37356<em>x</em> − 14057, <em>R</em>² = 0.5330, <em>p</em> &lt; 0.001), indicating that larger eggs provide enhanced nutrient reserves for larval survival in cold water. The gonadosomatic index (<em>GSI</em>) averaged 25.06 ± 3.74, significantly higher than that of low-altitude fish species, highlighting intense energy investment during the strictly seasonal breeding period in April. Comparative analysis with other <em>Triplophysa</em> species revealed distinct reproductive strategies; for example, <em>T. yarkandensis</em> exhibits higher absolute fecundity in turbid environments. This study provides preliminary baseline data on the reproductive traits of <em>T. strauchii</em> (e.g., fecundity, egg diameter, and gonadal development) during its April spawning period in Sayram Lake. The observed traits—including juvenile-dominated reproduction (2-year-olds as the core cohort), medium egg size, and high reproductive energy investment—offer initial insights into potential adaptive strategies for alpine cold-oligotrophic environments, though conclusions about its full annual reproductive cycle remain preliminary due to the single sampling period.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107558"},"PeriodicalIF":2.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impacts of management measures to address skate bycatch in the Southern Ocean: Evaluating Whiteleg skate (Amblyraja taaf) abundance and fishing mortality trends in Crozet Islands","authors":"Johanna Faure ,&nbsp;Clara Péron ,&nbsp;Arnaud Grüss","doi":"10.1016/j.fishres.2025.107559","DOIUrl":"10.1016/j.fishres.2025.107559","url":null,"abstract":"<div><div>Skates are common bycatch species in the toothfish (<em>Dissostichus</em> sp.) fisheries operating in the Southern Ocean. While spatial density patterns and abundance trends are difficult to estimate for elasmobranch species due to a lack of data, this information is crucial to quantify fishing mortality and inform bycatch management. In this study, we developed a modelling framework consisting of fitting vector autoregressive spatio-temporal (VAST) models to catch rate data collected over the period 2007–2023 by scientific observers onboard longliners targeting toothfish in the Crozet region. We generated catch rates in number of fish per km² by calculating an area swept for each catch observation as the distance fished multiplied by a bait plume value. We employed the model predictions to map the spatial density patterns of Whiteleg skate <em>(Amblyraja taaf)</em> and reconstructed the annual abundance trends of the species. Using the predicted annual abundances of Whiteleg skate and recent post-release survival estimates, we quantified the annual bycatch mortality of Whiteleg skate in the Crozet region. Overall, our results indicated an enhancement in Whiteleg skate abundance over the study period, with significant increases in the early 2010s and post-2020. Bycatch mortality rates decreased over time, coinciding with the implementation of conservation and management measures in the toothfish fishery. Our modelling framework provided valuable insights into skate density patterns, abundance trends and fishing mortality, highlighting positive effects of bycatch management. This modelling framework can be adapted to other bycatch case studies where accurate catch data are available, including through observer programmes.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107559"},"PeriodicalIF":2.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the management of the pelagic tuna fisheries in China: Evolution, challenges and recommendations","authors":"Xiao-lin CHU","doi":"10.1016/j.fishres.2025.107550","DOIUrl":"10.1016/j.fishres.2025.107550","url":null,"abstract":"<div><div>The objective of this article is to analyze the current challenges associated with the management of pelagic tuna fisheries (PTF) in China by examining its evolution, and to provide corresponding recommendations for improvement. Data on tuna catch is presented to illustrate the variations in China's PTF, while content analysis is employed to investigate the regulations, policies and measures related to PTF management. Since 1988, China’s PTF has undergone four distinct periods, marked by two significant transitions: first, a transition from an emphasis on the expansion of fisheries to a more balanced approach between fishery development and resource conservation, and ultimately, a prioritization of sustainable fisheries. Currently, China has implemented four aspects of management measures to supervise the PTF, which include regulating fishing capacity, collecting and reporting fishing data, implementing a Monitoring, Control and Surveillance (MCS) system, and enhancing by-catch management. Nonetheless, China continues to face several emerging challenges in improving PTF management, including a significant shortage of crew members, an inefficient industrial structure, a high frequency of safe and illicit incidents, and the ineffectiveness of the MCS system. It is advisable to standardize the management of foreign crews, establish a comprehensive industry chain, intensify scientific research, and improve crew training, as well as to enhance the effectiveness of the MCS system in order to advance the PTF management in the future.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107550"},"PeriodicalIF":2.3,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of brown shrimp stock and fishery dynamics in the German Bight using a novel biomass index","authors":"Marc H. Taylor,&nbsp;Holger Haslob,&nbsp;Kim Hünerlage,&nbsp;Alexander Kempf","doi":"10.1016/j.fishres.2025.107547","DOIUrl":"10.1016/j.fishres.2025.107547","url":null,"abstract":"<div><div>The brown shrimp (<em>Crangon crangon</em>) stock of the Wadden Sea supports one of the most important fisheries in the region due to its high productivity and market price. Given the species' short life history and seasonal dynamics, fisheries-based indicators (i.e., landings per unit effort, LPUE) are used to monitor stock biomass; however, these indicators may be biased by fishing behavior and thus require further evaluation. Using survey data from the German Bight area of the Wadden Sea, this study presents a novel species distribution model to estimate annual stock biomass changes for different size fractions (‘small’, &lt;50 mm; ‘large’, &gt;50 mm; and ‘combined’, all sizes), which are compared to LPUE and catch per unit effort (CPUE, with modelled discards) to evaluate their use as indicators of biomass. The results indicate that changes in LPUE are well correlated with biomass changes, although CPUE is shown to have an even stronger relationship to the combined biomass index, representative of exploitable biomass. This relationship is used to reconstruct monthly historical stock dynamics and estimate fishing exploitation rates (monthly harvest rate and annual fishing mortality). Estimated fishing rates reflect changes in fishing effort, which varies seasonally, in response to recruitment and subsequent exploitable biomass dynamics, and interannually, relating to reductions in fleet size and shorter-term pauses in effort. The resulting time series serve as a basis for further stock assessment models that can provide more biologically-based advice for the stock. The methodology’s combination of survey and fisheries-dependent data should be of interest to other data-limited applications; particularly, short-lived species where seasonal dynamics of the stock and fishery are of importance.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107547"},"PeriodicalIF":2.3,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comment on Murphy et al. response to: Reassessing the drivers of capelin recruitment in Newfoundland since 1991","authors":"Kenneth T. Frank,&nbsp;William C. Leggett","doi":"10.1016/j.fishres.2025.107545","DOIUrl":"10.1016/j.fishres.2025.107545","url":null,"abstract":"","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107545"},"PeriodicalIF":2.3,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Productivity versus engineering-based approaches to measure effort creep over time","authors":"Trevor Hutton,&nbsp;Sean Pascoe,&nbsp;Denham Parker","doi":"10.1016/j.fishres.2025.107546","DOIUrl":"10.1016/j.fishres.2025.107546","url":null,"abstract":"<div><div>Most fisheries stock assessments rely on fishery dependent data to a large extent, with catch per unit effort a key indicator of changes in stock conditions. However, increases in fishing efficiency due to changes in technology and physical fleet attributes distort the relationship between observable effort (e.g., days or hours fished), catch and biomass. To compensate, a key component of fisheries stock assessment is the estimation of changes in fishing power over time to adjust catch rate information for this “effort creep”. Two approaches have developed in parallel for estimating changes in efficiency of fishing vessels over time. An approach commonly applied in stock assessment is engineering-based, focusing on changes in physical inputs. In contrast, economic based approaches have developed for assessing efficiency change that also capture non-physical inputs such as fisher skill, management changes and resulting behavioural change. We apply both of these approaches to the Australian Northern Prawn Fishery (NPF) and test the degree to which the derived efficiency time series agree. We find that the two series are highly correlated and cointegrated, suggesting that both provide a consistent measure of efficiency change over time. In the case of the NPF, this validates the current method used to adjust for effort creep in the stock assessments.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107546"},"PeriodicalIF":2.3,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating potential fish distributions in artificial and natural reefs using an optical method: Insights from subtropical offshore wind farms","authors":"Jialu Wang,&nbsp;Shigeru Tabeta,&nbsp;Katsunori Mizuno","doi":"10.1016/j.fishres.2025.107536","DOIUrl":"10.1016/j.fishres.2025.107536","url":null,"abstract":"<div><div>With the goal of achieving clean energy and green transition, offshore wind farms (OWFs) have been rapidly established worldwide. The underwater pile foundations in OWFs have shown potential to serve as artificial reefs. To explore the ecological benefits in subtropical ecosystems, fish distributions were investigated at selected sites: two OWFs, a nearby natural reef, and a shipwreck reef. A low-cost optical method was developed to collect fish data, followed by deep learning techniques to identify four target species from underwater videos. To reconstruct distribution patterns from the sea surface to the bottom, fish densities were calculated along the recording path based on the camera view. In the OWFs, fish aggregation was confirmed by the high densities of round scad (0.025–0.26 per m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>) and spinefoot (0.052–0.15 per m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>). The target fish groups were observed near the individual wind turbine foundations throughout the entire vertical water column, with higher aggregation in the mid-water layers. Black scrapers exhibited the highest density at the shipwreck reef (0.024 per m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>). Damselfish were dominant at the natural reef area (0.055–0.14 per m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>); however, they were rarely found at the nearby OWF or shipwreck reef, indicating that the ecological function of artificial reefs may not fully cover that of natural reefs. Multiple regression analysis showed that the fish may exhibit specific preferences for structural features and environmental variables. This study provides insights into potential fish distributions to inform local managers and fishing enthusiasts, while supporting sustainable OWF development and contributing to marine conservation efforts.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107536"},"PeriodicalIF":2.3,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}