Fisheries Research最新文献

Effects on catches of green and blue light emitting diodes at the frame lines of diurnally deployed estuarine penaeid trawls 河口拖网日布设框架线上绿色和蓝色发光二极管对渔获量的影响

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-24 DOI: 10.1016/j.fishres.2025.107565

Matt K. Broadhurst

{"title":"Effects on catches of green and blue light emitting diodes at the frame lines of diurnally deployed estuarine penaeid trawls","authors":"Matt K. Broadhurst","doi":"10.1016/j.fishres.2025.107565","DOIUrl":"10.1016/j.fishres.2025.107565","url":null,"abstract":"<div><div>Penaeid trawls are among the world’s least selective fishing gears. This characteristic has justified decadal attempts at resolution and most commonly via retroactively fitted ‘bycatch reduction devices’ in the posterior sections to promote fish escape. However, ideally unwanted species would never enter a trawl. This study sought to investigate if fish could be avoided in diurnally deployed estuarine penaeid trawls via light emitting diodes (LEDs) located at the frame lines (headline and footrope). The assumption of few confounding effects of attaching six inactive LEDs (i.e. structures) to the frame lines was validated (experiment 1) before separate experiments were done to assess the effects on catches due to six active blue or green LEDs on the footrope (experiment 2) and then on the headline (experiment 3). Catches of the targeted school prawns, <em>Metapenaeus macleayi</em> and some fish (across all sizes; 4–20 cm total lengths), including mulloway, <em>Argyrosomus japonicus</em>, southern herring, <em>Herklotsichthys castelnaui</em>, and painted stinkfish, <em>Eocallionymus papilio</em> were similarly and significantly lower in trawls with at least one active LED treatment, and with greater consistency when these were on the headline. Some loss of target catches would preclude the commercial use of LEDs on the frame lines of the tested trawls. However, evidence of strong responses among some fish and their known behavioural and swimming differences to penaeids might support testing LEDs at other locations, including inside trawls, to reduce bycatches while maintaining target catches.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"292 ","pages":"Article 107565"},"PeriodicalIF":2.3,"publicationDate":"2025-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145340542","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}

引用次数: 0

Supplementation of adult Atlantic salmon (Salmo salar) restores biofilm biomass and benthic metabolism 补充成年大西洋鲑鱼（Salmo salar）可恢复生物膜生物量和底栖生物代谢

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-18 DOI: 10.1016/j.fishres.2025.107556

Kurt M. Samways

{"title":"Supplementation of adult Atlantic salmon (Salmo salar) restores biofilm biomass and benthic metabolism","authors":"Kurt M. Samways","doi":"10.1016/j.fishres.2025.107556","DOIUrl":"10.1016/j.fishres.2025.107556","url":null,"abstract":"<div><div>Restoration of adult Atlantic salmon (<em>Salmo salar</em>) populations can restore key ecological functions in nutrient-limited freshwater ecosystems. This study assessed the effects of marine-derived nutrients (MDNs) from spawning salmon on biofilm biomass and benthic metabolism in two adjacent watersheds, the Upper Salmon River (USR) and Point Wolfe River (PWR), located in and around Fundy National Park, New Brunswick, Canada. Using a Before-After-Control-Impact (BACI) design, between 2015–2017 we monitored changes in biofilm growth, metabolism, and stable isotope signatures across upstream (reference) and downstream (treatment) sites in both rivers. Significant increases in biofilm biomass (up to 0.099 μg chlorophyll m<sup>−2</sup>) and net daily metabolism (up to 13.1 mg O₂ m⁻² d⁻¹) were observed at treatment sites in the USR where adult salmon were released. In contrast, no such increases occurred in reference sites, or the non-supplemented PWR. Stable isotope analysis confirmed MDN assimilation in biofilm and linked enriched δ¹ ³C and δ¹ ⁵N values to the presence of adult salmon. A mass balance nutrient model demonstrated that adult salmon, unlike juvenile stocking, deliver net nutrient gains to streams. This study provides the first empirical evidence for functional ecosystem recovery in Atlantic salmon rivers via adult supplementation, emphasizing the role of salmon as a keystone species and supporting their use in both demographic and ecological restoration efforts in the endangered inner Bay of Fundy population range.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107556"},"PeriodicalIF":2.3,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333263","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}

引用次数: 0

Evidences of formation of predominant calcite polymorphs in otoliths of the fishes of riverine environment 河流环境鱼类耳石中方解石多晶形成的优势证据

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-17 DOI: 10.1016/j.fishres.2025.107552

Lubna Yasmeen, Mohd Sadiq, Mohd Hammad, Ameer Hamza, Begum Raziya Nargis, Mohammad Afzal Khan

{"title":"Evidences of formation of predominant calcite polymorphs in otoliths of the fishes of riverine environment","authors":"Lubna Yasmeen, Mohd Sadiq, Mohd Hammad, Ameer Hamza, Begum Raziya Nargis, Mohammad Afzal Khan","doi":"10.1016/j.fishres.2025.107552","DOIUrl":"10.1016/j.fishres.2025.107552","url":null,"abstract":"<div><div>Fish otoliths record biological and environmental history through a metabolically driven biomineralization process. The otolith's crystalline structure is due to the presence of calcium carbonate polymorphs that may influence trace element chemistry; thus, understanding otolith polymorphs is essential. This study employs confocal micro-Raman spectroscopy to investigate the crystalline polymorphs in otoliths of three freshwater fishes (<em>Heteropneustes fossilis</em>, <em>Channa punctata</em>, and <em>Labeo bata</em>) from the River Ganga. In all three fishes, Raman signals showed the strong calcite band intensities of <em>v</em><sub><em>1</em></sub> stretching mode at 1087 cm<sup>−1</sup> and weak signals of lattice mode at 154.9 cm<sup>−1</sup>, aragonite band intensities of <em>v</em><sub><em>4</em></sub> vibrational mode at 707 cm<sup>−1</sup> and lattice mode at 208 cm<sup>−1</sup>. The vaterite band intensities of the lattice mode were recorded in <em>L. bata</em> and <em>C. punctata.</em> The mean baseline-corrected Raman intensities were highest for calcite in all three fishes. The results suggested that calcite is the predominant polymorph in the selected fish species. The replacement of calcium by barium was mapped as witherite (BaCO<sub>3</sub>) in <em>H. fossilis</em> and <em>C. punctata</em>. The Kruskal-Wallis and <em>post hoc</em> Dunn’s test revealed significant differences among nearly all polymorph intensities. The findings can help to understand the biological processes involved in otolith formation and growth. Further detailed research is warranted to decipher the ecological factors that could have led to the relative abundance of calcite polymorphs in the target fish species.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107552"},"PeriodicalIF":2.3,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333181","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}

引用次数: 0

Effect of FAD closure on the energy efficiency of the purse seine fishery: FAD vs free swimming school strategy 围网渔场关闭对围网渔场能源效率的影响：围网渔场与自由游泳学校策略

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-17 DOI: 10.1016/j.fishres.2025.107563

Joseba Castresana, Oihane C. Basurko, Maitane Grande, Nagore Cuevas, Gorka Gabiña, Josu Santiago

{"title":"Effect of FAD closure on the energy efficiency of the purse seine fishery: FAD vs free swimming school strategy","authors":"Joseba Castresana, Oihane C. Basurko, Maitane Grande, Nagore Cuevas, Gorka Gabiña, Josu Santiago","doi":"10.1016/j.fishres.2025.107563","DOIUrl":"10.1016/j.fishres.2025.107563","url":null,"abstract":"<div><div>Tropical tuna purse seine fishing is one of the most important fisheries in the world, employing two strategies to fish: fish aggregating devices (FAD) and free-swimming school (FSC). International tuna management commissions have regulated the use of FADs to make the fishery more sustainable, by means of temporal FAD usage prohibitions, but the viability of these management measures is under debate. This study aims to (i) evaluate the energy efficiency, based on the fuel use intensity (FUI), carbon footprint and profitability (€<sub>catch</sub>/€<sub>fuel</sub>) of the tropical purse seine fishery, and (ii) determine the differences between fishing strategies, FAD versus FSC, in the Atlantic Ocean during FAD closure and non-closure periods by assessing, for the first time, the effect of FAD closure regulations in the energy efficiency and carbon footprint of the fishery. Data from 73 fishing trips (2019–2022) from 7 vessels were analysed, including vessel specifications, trip details, fuel usage, and catch data. FAD trips were more energy efficient, with lower carbon footprints and higher profitability (456 L/t; 1241.4 kgCO2/t; 2.93 €catch/€fuel) compared to FSC trips (1810 L/t; 4932.3 kgCO2/t; 2.54 €catch/€fuel) and mixed trips (588 L/t; 1602.0 kgCO2/t; 2.52 €catch/€fuel). During FAD closure, FSC trips had higher FUI and lower profitability (2736 L/t; 1.75 €catch/€fuel) than non-closure periods (541 L/t; 2.76 €catch/€fuel). FAD closure impacts the energy efficiency, carbon footprint, and economic profitability of the tropical tuna purse seine fishery; without FAD sets, FSC results in high FUI and low profitability.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107563"},"PeriodicalIF":2.3,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333180","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}

引用次数: 0

Estimates and potential drivers of protected species bycatch in the California set gillnet fishery 加州刺网渔业中受保护物种副渔获的估计和潜在驱动因素

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-17 DOI: 10.1016/j.fishres.2025.107560

Yutian Fang , James V. Carretta , Christopher M. Free

{"title":"Estimates and potential drivers of protected species bycatch in the California set gillnet fishery","authors":"Yutian Fang , James V. Carretta , Christopher M. Free","doi":"10.1016/j.fishres.2025.107560","DOIUrl":"10.1016/j.fishres.2025.107560","url":null,"abstract":"<div><div>The identification of efficient management strategies that reduce protected species bycatch while also minimizing impacts on fishing livelihoods is a global conservation challenge. Identifying such strategies requires understanding levels of bycatch relative to management targets as well as the relationship between bycatch risk and potential management actions. In this study, we use ratio estimation to reconstruct bycatch of select marine mammal and seabird species in the California ≥ 3.5” set gillnet fishery from 1981 to 2022 and random forest models to identify potential drivers and hotspots of bycatch risk. We find that bycatch has dropped precipitously since the 1980s as a result of management-induced reductions in fishing effort, but at significant costs to fisheries participation and revenues. Recent marine mammal bycatch ranges from 0.1 % to 4.0 % of the potential biological removal and marine mammal populations are recovering. Spatial-temporal correlates of bycatch risk were more important than fishing-related correlates of risk, suggesting that spatial-temporal closures would reduce bycatch more reliably than mesh size or soak time restrictions. For each species, we identified 1–3 hotspots of bycatch risk as candidates for temporary seasonal closures. Bycatch risk for harbor seal (<em>Phoca vitulina</em>) and California sea lion (<em>Zalophus californianus</em>), the species with the greatest bycatch risk, is especially high from April 1st to June 15th, suggesting that hotspot closures during this 2.5-month time period could be particularly efficient. Our study also highlights the value of competing multiple sample balancing approaches to identify methods that best predict rare bycatch events.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107560"},"PeriodicalIF":2.3,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333267","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}

引用次数: 0

Long-distance migrations of catfishes in two large tropical rivers: The Ayeyarwady and Mekong rivers 两大热带河流：伊洛瓦底江和湄公河中鲶鱼的长途迁徙

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-17 DOI: 10.1016/j.fishres.2025.107562

An V. Vu , Lee J. Baumgartner , John Conallin , Zau Lunn , Nyein Chan , Ian G. Cowx , Martin Mallen-Cooper , Gregory S. Doran , Bronwyn M. Gillanders , Jason D. Thiem , Cameron M. Kewish , Karin Limburg

{"title":"Long-distance migrations of catfishes in two large tropical rivers: The Ayeyarwady and Mekong rivers","authors":"An V. Vu , Lee J. Baumgartner , John Conallin , Zau Lunn , Nyein Chan , Ian G. Cowx , Martin Mallen-Cooper , Gregory S. Doran , Bronwyn M. Gillanders , Jason D. Thiem , Cameron M. Kewish , Karin Limburg","doi":"10.1016/j.fishres.2025.107562","DOIUrl":"10.1016/j.fishres.2025.107562","url":null,"abstract":"<div><div>Understanding fish migration ecology is crucial for fisheries management. In this study, trace element and strontium isotope ratios were analysed in otoliths (ear-stones) of four economically important catfish species (Pangasiidae): <em>Pangasius krempfi</em> and <em>P. mekongensis</em> in the Mekong River, and <em>P. pangasius</em> and <em>Pangasius</em> sp. in the Ayeyarwady River to understand their migratory behaviour. Our findings showed that all four catfish species exhibited long-distance migrations: specifically, growth occurred in marine and brackish environments but migrations to fresh water were undertaken for spawning (anadromy). We identified cyclical variation in otolith elemental concentrations, suggesting these catfishes either migrated repeatedly between brackish and marine environments, or remained in estuarine areas where water chemistry varied seasonally. Additionally, evidence of multiple migration strategies was found among these catfishes. Regardless of species or river system there was consistent evidence supporting long-distance migrations that extended up to 3000 km on a return trip between feeding (marine) and spawning grounds (freshwater). To maintain viable populations of these long-distance migratory catfishes, ensuring river-to-sea connectivity is essential for the completion of their life cycles. Local and regional management plans should be developed to regulate anthropogenic pressures (e.g. dams and fishing) along their migration routes and current or planned water infrastructure should address the requirement for unimpeded bi-directional movement.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107562"},"PeriodicalIF":2.3,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333184","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}

引用次数: 0

Habitat connectivity and stock structure of the dog snapper (Lutjanus jocu) in the southwestern Atlantic 西南大西洋鲷的生境连通性和种群结构

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-16 DOI: 10.1016/j.fishres.2025.107551

Patrick Derviche , Michael Dance , Mario Condini , Eduardo Costa , Fabian Sá , Felippe Daros , Maurício Hostim-Silva , Marcelo Soeth

{"title":"Habitat connectivity and stock structure of the dog snapper (Lutjanus jocu) in the southwestern Atlantic","authors":"Patrick Derviche , Michael Dance , Mario Condini , Eduardo Costa , Fabian Sá , Felippe Daros , Maurício Hostim-Silva , Marcelo Soeth","doi":"10.1016/j.fishres.2025.107551","DOIUrl":"10.1016/j.fishres.2025.107551","url":null,"abstract":"<div><div>Although the dog snapper <em>Lutjanus jocu</em> has experienced population declines in the southwestern Atlantic due to overfishing and habitat quality loss, information on the contribution of distinct nursery habitats (NHs) to the exploited populations on adult grounds (AGs) is scarce. We assessed the connectivity among juvenile (n = 98) and adult (n = 69) dog snappers across three NHs and two AGs along over 400 km of a tropical coastline. By identifying otolith multi-elemental signatures using a Random Forest model, we achieved a good overall classification accuracy of 77.2 % (TSS = 0.716). Following a life history criteria in stock delineation, we identified two exploited dog snapper’ stocks that exhibited marked contrasts in nursery origin. The exploited stock from southern upwelling AGs predominantly originated from estuarine environments (84.0 %), suggesting a strong dependence on mangroves. In contrast, stock from northern warm-water AGs displayed a higher diversity in the habitat’s nursery origin, with most individuals coming from the marine environment (75.0 %). Of these, 68.2 % were from their own non-upwelling AGs, consisting of biogenic coral reefs, and 6.8 % from upwelling AGs, characterized by rocky reefs. Barium was the most important element in habitat discrimination, accounting for 31.0 % of the model performance, while other elements, such as Al, Cu, Zn, and Pb contributed less than 10 % each. In conclusion, our results support the existence of two stocks by exhibiting distinct life history traits, that managers may consider when implementing fisheries management measures or designing protected areas.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107551"},"PeriodicalIF":2.3,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333262","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}

引用次数: 0

Institutional context and methods of knowledge mobilization: The case of Marine Stewardship Council (MSC) – Certified fishery of Lagonoy Gulf, Bicol Region, Philippines 制度背景和知识动员的方法：海洋管理委员会（MSC）案例-菲律宾比科尔地区Lagonoy湾的认证渔业

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-16 DOI: 10.1016/j.fishres.2025.107543

Gideon Binobo , Ben Bradshaw , Ataharul Chowdhury

{"title":"Institutional context and methods of knowledge mobilization: The case of Marine Stewardship Council (MSC) – Certified fishery of Lagonoy Gulf, Bicol Region, Philippines","authors":"Gideon Binobo , Ben Bradshaw , Ataharul Chowdhury","doi":"10.1016/j.fishres.2025.107543","DOIUrl":"10.1016/j.fishres.2025.107543","url":null,"abstract":"<div><div>Knowledge mobilization is a key issue in fisheries governance and an instrument to leverage effective governance. There exists a significant research gap about how a certified fishery supports knowledge mobilization in the Philippines. To answer this gap, this study was tailored to investigate the relevance of knowledge mobilization in the context of Marine Stewardship Council (MSC)-certified fishery based in Lagonoy Gulf, Philippines. Specifically, this study was carried out to: analyze the institutional context of MSC-certified fishery based in Lagonoy Gulf; examine the level of awareness of small-scale fishers with respect to MSC certification program; determine whether the MSC certification program has facilitated the taking of adaptation pathways among small-scale fishers; and identify the most preferred method of knowledge mobilization among small-scale fishers. Data were collected through key-informant interviews, subject interviews, focus-group discussions and participant observation. Interview transcripts were uploaded to NVivo platform for data collation and were inputted to the Voyant tools for discourse analysis. Results of this study revealed that fisheries governance in Lagonoy Gulf is immersed in fragmented collaborative governance where hierarchical, market-based and participatory governance modes converge. Majority of small-scale fishers of Lagonoy Gulf were unfamiliar about MSC certification as a market-based program. MSC fisheries certification missed the opportunity to facilitate the fishers to take on adaptation pathways to deal with climate change and other stressors. To promote knowledge mobilization, ‘incentivized community meetings and seminars’ were identified as effective motivators. The limited understanding of fishers regarding MSC certification highlights a failure in knowledge mobilization.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107543"},"PeriodicalIF":2.3,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333185","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}

引用次数: 0

Article title: Effects of a fishery closure on the European eel stock on the Swedish west coast 文章标题：渔业关闭对瑞典西海岸欧洲鳗鱼种群的影响

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-16 DOI: 10.1016/j.fishres.2025.107564

Torbjörn Säterberg , David Gilljam , Per B. Holliland , Philip Jacobson , Rob van Gemert

{"title":"Article title: Effects of a fishery closure on the European eel stock on the Swedish west coast","authors":"Torbjörn Säterberg , David Gilljam , Per B. Holliland , Philip Jacobson , Rob van Gemert","doi":"10.1016/j.fishres.2025.107564","DOIUrl":"10.1016/j.fishres.2025.107564","url":null,"abstract":"<div><div>Fishing bans are implemented as management measures aimed at rebuilding depleted stocks, albeit with varying levels of success. In 2012, the commercial fishery for the European eel stock on the Swedish west coast was closed to increase the spawning migration from this local stock. However, despite being regarded as one of the most important management measures implemented in Swedish eel management, an assessment of the effects of this fishing closure on the eel stock has not previously been conducted. Here, in an integrated analysis, we use historical catch data in conjunction with standardized fisheries independent fyke-net data from three sites along the Swedish west coast to build a novel stock assessment model to quantify the effects of the fishery closure. The model is length-based, and escapement rates—that is, the rate at which eels escape from the system to migrate to and spawn in the Sargasso Sea—are estimated as an integral part of the analysis. Our results suggest that total escapement has increased fourfold compared to historical levels (compared to 1988–2011) and that the stock has reached its potential maximum escapement under current low recruitment conditions. Hence, the fishing closure seems to have had its intended effect of rebuilding a depleted stock, though it should be acknowledged that post fishing closure estimates of eel escapement are based on survey data from only three local sites. Nevertheless, our study constitutes a rare example of where the effects of management actions targeting European eel have been quantified.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107564"},"PeriodicalIF":2.3,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333182","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}

引用次数: 0

Sclerochronological age synchrony corroborates remarkable lifespan and protracted asymptotic growth for a deepwater snapper (Pristipomoides zonatus) in the Indian and Pacific Oceans 在印度洋和太平洋的深水鲷鱼（pritipomoides zonatus）的显著寿命和持久的渐近生长的时代同步证实

IF 2.3 2区农林科学

Fisheries Research Pub Date : 2025-10-15 DOI: 10.1016/j.fishres.2025.107555

Corey B. Wakefield , Joyce J.L. Ong , Ashley J. Williams , Brett M. Taylor , Allen H. Andrews , Mark Burton , Simon J. Nicol , Stephen J. Newman

{"title":"Sclerochronological age synchrony corroborates remarkable lifespan and protracted asymptotic growth for a deepwater snapper (Pristipomoides zonatus) in the Indian and Pacific Oceans","authors":"Corey B. Wakefield , Joyce J.L. Ong , Ashley J. Williams , Brett M. Taylor , Allen H. Andrews , Mark Burton , Simon J. Nicol , Stephen J. Newman","doi":"10.1016/j.fishres.2025.107555","DOIUrl":"10.1016/j.fishres.2025.107555","url":null,"abstract":"<div><div>Although <em>Pristipomoides zonatus</em> (oblique banded snapper) constitutes an important fisheries resource throughout its broad geographic distribution across the Indo-Pacific region, life history information remains poorly understood, particularly throughout the southern hemisphere. This study used nascent otolith preparation methods to produce very thin transverse sections (∼150 µm) that improved the accuracy and precision of age estimates. The use of sclerochronological crossdating determined that opaque zones were deposited annually in otoliths and were synchronous with time-specific environmental climate records (i.e., the Leeuwin Current) over nearly four decades (1969–2007). These chronologies also exhibited a strong inter-series correlation that indicated clear and synchronous growth among all individuals (expressed population signal, EPS = 0.728). The growth of this species differed significantly between sexes and oceans, with each sex reaching a greater length-at-age in the Pacific Ocean compared to the Indian Ocean, and males attained a greater length-at-age than females within each ocean. All growth trajectories exhibited a very protracted asymptote of up to five decades with exceptional longevities recorded for both oceanic regions to a maximum age of 60 years. The results of this study indicated that stock assessments of <em>P. zonatus</em> would benefit from an explicit understanding of the regional biology and the use of sex-specific growth curves for more reliable biomass estimates.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"291 ","pages":"Article 107555"},"PeriodicalIF":2.3,"publicationDate":"2025-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145333179","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}

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