Fisheries Research最新文献

{"title":"Impact and size selectivity of fishing gears used in estuarine crab fisheries","authors":"João N. Monteiro ,&nbsp;Andreia Ovelheiro ,&nbsp;Maria Alexandra Teodósio ,&nbsp;Francisco Leitão","doi":"10.1016/j.fishres.2025.107284","DOIUrl":"10.1016/j.fishres.2025.107284","url":null,"abstract":"<div><div>Crustacean fisheries have expanded in the last decade due to the high economic value of the species. However, estuarine crustacean fisheries remain poorly studied compared with marine crustacean fisheries. In Portugal, the European green crab (<em>Carcinus maenas)</em> may become increasingly important for the fishing industry and seafood production in general, especially in the current context of overexploitation of estuarine traditional fisheries resources. The unknown ecological impact of crab fishing gear and its size-selectivity characteristics constrain gear regulations by fisheries authorities. We developed an integrated study over three years to analyse a <em>C. maenas</em> fishery in three Portuguese estuarine systems aiming to: 1) describe the fishing characteristics and <em>modus operandi</em> of the fishing gears; 2) analyse gear selectivity and catch rates; 3) analyse environmental impact of fishing gears; 4) Contribute to supporting better regulations for the fishery. Two types of crab fishing gear are used, box traps and drop nets. Daily catches of green crabs varied by gear, system, and month, with the highest catches observed in box traps during the warmest months. Selectivity studies indicate that a mesh size of 18 mm in box traps and 30 mm in drop nets would allow crabs larger than the minimum landing size (40 mm carapace width) to be targeted while maximising catch rates. However, regardless of the mesh size, the catch from both gears will need to be sorted to exclude juveniles from the catch. The bar spacing, which allows crabs to be sorted according to the minimum landing size, is 17 mm. Gears present none (drop nets) or low by-catch (220 g or 23 individuals/40 box traps), which was promptly discarded, indicating a low impact on estuarine communities. The methodology used in this study, which combines ecological impacts and technical gear issues (selectivity), can be directly applied to enforce regulations and improve sustainable exploitation of socio-economically important artisanal fisheries.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107284"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Analysis and prediction of fishing capacity of marine fishing vessels based on generalized additive models","authors":"Shuang Liu ,&nbsp;Xiu-Jie Cui ,&nbsp;Chao Lyu","doi":"10.1016/j.fishres.2025.107268","DOIUrl":"10.1016/j.fishres.2025.107268","url":null,"abstract":"<div><div>This study used Generalized Additive Models (GAM) to analyze single-vessel catch volume using the 2018 operational survey data of fishing vessels from three provinces in the South China Sea. The results of our analysis showed that PCA1 (the factor after dimension reduction of total tonnage and length of the vessel), PCA2 (the factor after dimension reduction of type width and type depth), power, age, and operation time (OT) all had a significant effect on catch volume. By comparing the performance of different GAM models, it was found that PCA1, PCA2, power, age, and operation time provided the highest explanatory power, explaining 63.52 % of the cumulative deviation of the catch volume. Cross-validation analysis showed that when the dataset was randomly divided into a training set and a test set with a ratio of 0.67:0.33, the fitted coefficient of determination was approximately 0.76, indicating good predictive performance of the model. This study proposes an objective approach to quantify single-vessel fishing capacity and assessing single-vessel catch volume, explore the scientific value inherent in fishing data; it also provides a reference for the intelligent application of fishing data.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107268"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161187","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":"Reducing codend mesh size and changing configurations to improve selectivity in Australian whiting (Sillago spp.) trawls","authors":"Matt K. Broadhurst ,&nbsp;Russell B. Millar","doi":"10.1016/j.fishres.2025.107273","DOIUrl":"10.1016/j.fishres.2025.107273","url":null,"abstract":"<div><div>In response to individual transferable quotas (ITQ) being implemented for whiting (<em>Sillago flindersi</em> and <em>S. robusta</em>) off New South Wales (NSW), Australia, two experiments were done to investigate if fish-trawl target inefficiencies and absolute bycatches could be reduced by replacing the legislated codend (handicapped by a minimum legal stretched mesh opening—SMO twice the optimum) with smaller-meshed designs. In experiment 1, compared to a conventional codend comprising 95 mm SMO (with a stretched circumference of ∼20 m, but restricted to 3.4 m by a rope), an unrestricted codend made from 46 mm SMO at an appropriate circumference (∼11 m stretched) and surrounded by a 94-mm SMO lifting bag caught ∼3–8 × more whiting h^–1 trawled. Total bycatch weight h^–1 trawled also increased, but only by ∼2 × and so, in terms of absolute amounts, fishing the smaller-meshed codend could evoke at least a 37 % reduction in discarded bycatch (or ∼1800 t) and ∼5500 h less trawling to harvest an average of ∼425 t of whiting quota each year by fish trawlers in NSW. In experiment 2, replacing 40 % of the 46-mm codend with a cylinder of smaller 41 mm SMO turned 90° (‘T90’) and with the same lifting bag further improved efficiency for whiting, but not size selectivity, and without affecting bycatch. The results illustrate the need to consider concomitant fishing-gear modifications in fisheries transferring to ITQ management to minimise unwanted environmental impacts.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107273"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160413","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":"Diet and trophic niches of sympatric Seriola species revealed by stomach content and multi-tissue stable isotope analyses","authors":"Xu Wei ,&nbsp;Yan Wang ,&nbsp;James R. Tweedley ,&nbsp;Neil R. Loneragan ,&nbsp;Tao Tian ,&nbsp;Zhilin Wang ,&nbsp;Yanchao Zhang ,&nbsp;Wencong An ,&nbsp;Longfei Xu ,&nbsp;Zhongxin Wu","doi":"10.1016/j.fishres.2025.107272","DOIUrl":"10.1016/j.fishres.2025.107272","url":null,"abstract":"<div><div>Amberjacks in the family Carangidae are large, carnivorous pelagic fish that are highly targeted by fisheries globally. <em>Seriola lalandi</em> and <em>Seriola quinqueradidata</em> co-occur seasonally in the northern Yellow Sea and are caught by recreational fishers. This study used stomach content analysis (SCA) and stable isotope analysis (SIA) of δ¹³C and δ¹⁵N from liver and muscle tissues to investigate the dietary composition (including ontogenetic shifts), trophic niche breadth and overlap of these two species. This combination of techniques provides information on immediate diet (SCA), and short-term (∼3 months, liver SIA) and longer-term (∼5–6 months, muscle SIA) trophic assimilation. Both <em>Seriola</em> species were carnivorous, mainly feeding on fish, particularly the anchovy <em>Engraulis japonicus</em>, as well as crustaceans and cephalopods. Their diet shifts to larger-sized fish prey (e.g. mackerel <em>Scomber japonicus</em>) with ontogeny. Differences in δ¹³C values of liver and muscle were detected for both species, and for δ¹⁵N values for <em>S. lalandi.</em> Interspecific differences in δ¹⁵N and δ¹³C values for muscle and δ¹⁵N for liver were detected but no differences in δ¹³C values for liver tissue. δ¹⁵N values for liver and muscle were correlated with fork length in both species, suggesting a shift to higher-trophic level prey with ontogeny. <em>Seriola lalandi</em> had a broader trophic niche than <em>S. quinqueradidata</em>, indicating that the former species had a higher trophic diversity<em>.</em> Isotopic niche overlap between species were greater for the shorter-term liver (0.81) than longer-term muscle (0.39), which might reflect different overwintering habitats for the species or temporal-spatially partitioning in their pelagic habitat use during their reproductive migration. The study facilitated a better understanding of the trophic dynamics of sympatric <em>Seriola</em> species and provides information for implementing ecosystem-based fisheries management for these highly targeted species.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107272"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161186","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":"Commercial pot selectivity for European lobster, Homarus gammarus, estimated through a novel v-notching mark-recapture approach","authors":"Charlotte Heney ,&nbsp;Julie M. Gross ,&nbsp;John M. Hoenig ,&nbsp;Natalie Hold","doi":"10.1016/j.fishres.2025.107283","DOIUrl":"10.1016/j.fishres.2025.107283","url":null,"abstract":"<div><div>Understanding gear selectivity can improve interpretation of population size data derived from commercial landings and support stock assessment models. The selectivity of gear over time often evolves, either due to industry modifications or as the result of implemented management regulations. Such gear modifications can be utilised to better target desired sizes of commercial species or to mitigate against bycatch issues. Most of the European lobster, <em>Homarus gammarus,</em> fishers use parlour pots and often utilise an escape gap to allow undersized animals and bycatch to exit. To quantify the gear selectivity of commercial parlour pots with and without escape gaps we utilise v-notching, as a novel approach to mark and recapture. Across both gear types, a total of 933 lobsters were notched (all sizes and both sexes) and 316 were recaught (34 %). A generalised linear model framework was applied to estimate selectivity which considered the interaction between size and sex of lobsters. Gear with escape gaps showed that males exhibit a dome-shaped selectivity curve, with the peak at 100–109 mm carapace length (CL) whereas females were less catchable for all size categories except for the smallest size class of 80–89 mm CL. Gear without escape gaps predominantly selected for small animals of both sexes (&lt;90 mm) but, again, males exhibit a dome-shaped selectivity, with a peak at 80–89 mm (CL). This indicates that pots with escape gaps clearly select for legal-sized animals (&gt;90 mm) for both sexes. This novel use of v-notching in mark-release-recapture surveys demonstrates the potential to quantify the efficacy of the gear used in the fleet and shows the scientific benefit of utilising current fishery management measures and fisher collaboration.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107283"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Factors sustaining the snail artisanal fishery in the San Matías Gulf, Patagonia, Argentina","authors":"María Soledad Avaca ,&nbsp;Paula de la Barra ,&nbsp;Ana Cinti ,&nbsp;Maite Narvarte","doi":"10.1016/j.fishres.2025.107282","DOIUrl":"10.1016/j.fishres.2025.107282","url":null,"abstract":"<div><div>In the San Matías Gulf, Argentina, artisanal fishers have adapted to declining stocks of traditional species by targeting alternative resources, such as the snail <em>Buccinastrum deforme</em>. This study investigates the sustainability of this artisanal diving fishery, emphasizing the role of informal rules and the socio-economic context of the fishers. We analyzed annual landings, fishing effort, and catch composition from 2000 to 2021 using mandatory landing reports and commercial data. Annual catches fluctuated, starting at 4 metric tons in 2000, peaking at 82 metric tons in 2011, and stabilizing at around 38 metric tons thereafter. Market demand, particularly from Asian markets between 2010 and 2016, influenced fishing dynamics, with a strong correlation between fishing effort and landings. Fishers exhibited adaptive strategies, alternating between mixed and non-mixed trips based on economic incentives. Analysis of size and sex composition of the catches revealed stable biological characteristics over time. Interviews with fishers revealed socio-economic challenges, including lack of health insurance, while highlighting the importance of fishing for household income. Informal management practices, such as selective harvesting and market-driven size preferences, have contributed to the stability of the fishery, although increased fishing effort raises concerns about sustainability. These findings provide valuable insights for the management of other small-scale fisheries facing similar challenges.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107282"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160841","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":"Red snapper in the Gulf of Mexico: Can offshore populations export larval subsidies to nearshore fishing grounds?","authors":"Ana C. Vaz ,&nbsp;Mandy Karnauskas ,&nbsp;Kate Siegfried ,&nbsp;Matthew W. Smith ,&nbsp;LaTreese S. Denson ,&nbsp;Christopher Gardner ,&nbsp;John F. Walter III","doi":"10.1016/j.fishres.2025.107271","DOIUrl":"10.1016/j.fishres.2025.107271","url":null,"abstract":"<div><div>The contribution of red snapper offshore populations to the replenishment of exploited areas in the Gulf of Mexico has been a source of debate and uncertainty in the management of this species for decades. Here, we investigate the spatial patterns of larval connectivity of red snapper in the Gulf, estimating source-sink dynamics and exploring how exploitation pressure can alter these patterns. Our results suggest that while the offshore cryptic biomass can contribute a large percentage of settlers to the Gulf, offshore biomass is unlikely to replenish highly exploited nearshore fishing grounds due to low likelihood of larval transport between offshore and nearshore habitats. Our results also indicate that high fishing pressure in nearshore areas, particularly by the recreational fishery, can change larval connectivity patterns. Taken together, our study provides insight into the complex interactions between heterogeneous fishing pressure and larval source-sink dynamics. Overall, this study highlights the importance of managing for localized depletion and balancing commercial and recreational fishing priorities. The findings emphasize the need for fine-scale spatial considerations in red snapper fishery management to address larval connectivity dynamics and mitigate the impact of exploitation.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107271"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161189","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":"Diverse social and business networks shape the puerulus harvest industry along southern Indonesia","authors":"Anes Dwi Jayanti ,&nbsp;Ingrid van Putten ,&nbsp;Emily Ogier ,&nbsp;Caleb Gardner","doi":"10.1016/j.fishres.2024.107263","DOIUrl":"10.1016/j.fishres.2024.107263","url":null,"abstract":"<div><div>Puerulus harvesting plays a crucial role in sustaining coastal communities in Indonesia. However, there is limited information available on the local socio-economic impact of this fishery. This study aims to gain a comprehensive understanding of this complex fishery system and the socio-economic variability within the puerulus fishery. The study examines the social dimensions by analysing connections among fishers and traders in diverse regions to identify trading variations and supply chain arrangements. Data from 75 puerulus fishers and 12 traders in Cisolok, Cilacap, Prigi, Popoh, and Lombok was collected through structured questionnaires, profiling livelihood conditions, operations, social networks, business arrangements, supply chains. The results highlight the significant impact of robust information sharing and agreements within local trade networks on the financial benefits generated through puerulus fishing for coastal fishers. Fishing and business arrangements are influenced by the characteristics of the local trade network, including geographic and economic resources. In summary, puerulus harvesting is important for coastal fishers, interconnected with trade relationships and networks. Transparency in information sharing through patron-client systems in puerulus fisheries is found to be a significant factor influencing the generation and distribution of benefits across different stakeholders in the supply chain.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107263"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Making do with less: Extending an acoustic-based time series of euphausiid abundance using an uncrewed surface vehicle with fewer frequencies","authors":"Mike Levine,&nbsp;Alex De Robertis","doi":"10.1016/j.fishres.2025.107270","DOIUrl":"10.1016/j.fishres.2025.107270","url":null,"abstract":"<div><div>Survey time series are used to track species- and ecosystem-level trends over time to support ecosystem-based fishery management. However, these recurring survey efforts are subject to unpredictable cancellations and reductions in effort. This occurred in 2020 when the COVID-19 pandemic forced the cancellation of the research vessel-based 2020 eastern Bering Sea (EBS) acoustic-trawl survey, which has provided an estimate of euphausiid abundance and distribution since 2004. As a partial replacement for this lost effort, three uncrewed surface vehicles (USVs) were used to collect acoustic data. In contrast to the standard vessel-based survey, which provides 4-frequency acoustic data, the USVs collected acoustic data at only two frequencies. This presented a challenge given that four frequencies are currently used to identify euphausiids in this time series. Here, we first evaluated two methods to provide comparable euphausiid abundance estimates using fewer acoustic frequencies. We found that a random forest classifier was able to produce abundance estimates comparable to those obtained in the vessel-based time series. This method was then used to estimate euphausiid abundance and distribution from the 2020 USV survey. We additionally estimated the increase in survey uncertainty due to the use of the random forest classifier and changes in the acoustic instruments. Together, this allowed for the EBS euphausiid abundance time series to be extended with fewer acoustic frequencies.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107270"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Interconnected partnerships: Mapping collaborations in Australian fisheries stock assessment","authors":"Ingrid van Putten ,&nbsp;Catherine M. Dichmont ,&nbsp;Natalie A. Dowling ,&nbsp;Roy A. Deng ,&nbsp;Sean Pascoe ,&nbsp;André E. Punt","doi":"10.1016/j.fishres.2025.107281","DOIUrl":"10.1016/j.fishres.2025.107281","url":null,"abstract":"<div><div>Collaboration in science is important because it can lead to efficient knowledge exchange and grow scientific understanding. Examining the nature of co-authorship on reports and peer- reviewed papers can give insight into aspects of science collaboration. Here we examine the bibliographic networks of scientists who provide the scientific basis for Australian fisheries decision making using the methods of stock assessment. We focus on Australian stock assessments and determine co-author clustering around organisation, geolocation, and fished species. For the peer- reviewed literature there is evidence of clustering around a few individual authors characterised by their large number of publications and their relatively frequent first authorship. These stock assessment networks are vulnerable because knowledge exchange may be constrained by repeat collaboration with the same central co-authors who are mostly from the same organisation, leading to siloing. However, this does not mean the stock assessments are necessarily wrong. We also find that network connectedness is highly influenced by a few papers that have a higher-than-average number of co-authors, many of which involve “one-off” authors. This study highlights the need for increased and diversified collaboration, facilitation of interactions, and greater information sharing, among stock assessment scientists who provide the scientific basis for fisheries decision making. This needs to be balanced against the capacity of the available pool of stock assessment scientists.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107281"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}