Fisheries Management and Ecology最新文献

{"title":"Optimal mesh size of traps for marbled flounder (Pseudopleuronectes yokohamae) based on biological and economic factors","authors":"Myungsung Koo,&nbsp;Inyeong Kwon","doi":"10.1111/fme.12730","DOIUrl":"10.1111/fme.12730","url":null,"abstract":"<p>Gear selectivity is crucial in fisheries management because it influences the size and species of fish caught, with traditional methods often basing optimal mesh size on the mature length of a target species. However, to ensure sustainable fisheries, both biological aspects of resource protection and fishing operation efficiency must be considered. This study aimed to determine the ideal mesh size for trap fishing of marbled flounder (<i>Pseudopleuronectes yokohamae</i>) in Gyeongsangnam-do, South Korea, by using biological and economic factors for sustainable fisheries management. We sampled fish caught in traps of varying mesh sizes (35, 50, 65, 80, and 100 mm) and developed two models based on fish maturity, bycatch ratio, and CPUE. Model 1 used a maturity criterion of 17.8 cm, and Model 2 used the legal minimum length limit of 20 cm. Net selectivity curves indicated that the optimal mesh size ranged 50–65 mm based only on a minimum mature body length of 17.8 cm. In contrast, the optimal mesh size based on both biological and economic factors ranged 57.5–90 mm. Our findings could guide policymakers in enhancing marble flounder population management strategies through policy adjustments in mesh size and gear restrictions.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12730","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sorting grid usage to reduce the catch of undersized narrow-clawed crayfish (Pontastacus leptodactylus Eschscholtz, 1823) in fyke net fisheries","authors":"Mehmet Cilbiz,&nbsp;Celalettin Aydın","doi":"10.1111/fme.12731","DOIUrl":"10.1111/fme.12731","url":null,"abstract":"<p>Sustainability of natural stocks of crayfish is critical because of their economic and ecological importance. Crayfish (<i>Pontastacus leptodactylus</i>), one of the most important species in Turkish inland fisheries, has been facing serious threats recently. One threat the species faces is high landed bycatch of undersized crayfish because of selective fishing gear, such as fyke nets. We estimated size-selectivity of sorting grids with various bar spacings for crayfish to reduce bycatch. Six bar spacings (15.0, 17.5, 20.0, 22.5, 25.0, and 30.0 mm) were tested alongside commercial crayfish fyke nets. Mean selectivity (<i>L</i>₅₀) (±95% CI) was 6.90 (6.63–6.99) cm for 15.0 mm bar spacing, 7.52 (7.16–8.02) cm for 17.5 mm, 8.52 (8.32–8.71) cm for 20.0 mm, 9.70 (9.28–9.90) cm for 22.5, 10.75 (10.34–11.17) cm for 25.0 mm, 11.80 (11.31–12.24) cm for 30.0 mm, and 8.79 (8.05–9.29) cm for commercial fyke nets. The proportion of undersized specimens caught be reduced from 32.27% for commercial fyke nets to as low as 2.46% by using sorting grids. The codend of 22.5 mm bar spacing was more selective, with significantly lower discard rates, and more effective for individuals above the minimum conservation reference size than commercial fyke nets.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12731","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate change effects on abundance and distribution of the European eel in Türkiye","authors":"Burcu Mestav,&nbsp;Şükran Yalçın Özdilek,&nbsp;Zahide Acar,&nbsp;Kemal Gökkaya,&nbsp;Nurbanu Partal","doi":"10.1111/fme.12732","DOIUrl":"10.1111/fme.12732","url":null,"abstract":"<p>Spatial and temporal distribution of European eel (<i>Anguilla anguilla</i>) during 1967–2020 was used to model European eel distribution in response to climate variability. Modeling integrated predictions from two distinct models for inferences. First, modeling of the relationship between temperature and precipitation and European eel catch values using multiple time-series regression analyses showed that climate variables contributed to eel distribution in Türkiye. Eel catch became restricted to western and southern coasts of Türkiye and total catch decreased between 1967 and 2020. From 1967 to 2020, favorable climatic conditions for European eels in Türkiye were characterized by moderate temperatures. Furthermore, projections for 2050 and 2070 suggested that suitable habitat would be lost in Türkiye. Our findings underscore the urgent need for immediate and widespread implementation of effective conservation policies to mitigate threats to European eel in Türkiye and globally.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12732","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Existing datasets uncover complex interactions driving catches of a data-poor recreational fishery in South Australia","authors":"Leonardo Maia Durante,&nbsp;Crystal Beckmann,&nbsp;Frédéric Bailleul,&nbsp;Greg Ferguson","doi":"10.1111/fme.12727","DOIUrl":"10.1111/fme.12727","url":null,"abstract":"<p>Understanding drivers of effort and catch is important for sustainable management of recreational fisheries. For the Pipi (<i>Latona deltoides</i>) fishery in South Australia as a case study, publicly available datasets on fisher demography, market forces and internet connectivity improved understanding of fisher motivations and capabilities, identified different historical periods in the fishery and addressed temporal gaps in effort and catch estimates from on-site surveys. Most variables were correlated with recreational effort and catch estimates from on-site surveys and principal component analysis identified 2013–2014, 2015–2018 and 2019–2022 as distinct periods in the Pipi fishery. Results corroborated studies and anecdotal information that suggested declining availability and higher prices of local, commercially caught Pipi, and reduced imports of bivalves from Asia that previously supplied the South Australian bait market. Reduced availability and higher prices of Pipi likely motivated recreational fishers to gather their own bait to increase catch over the years. Similarly, increased internet and smartphone access and increased numbers of utility vehicles aided recreational catch efficiency of Pipi. Effective management of recreationally harvested resources requires understanding of external processes that drive fisher motivations and capabilities, particularly for stocks that are shared among fisheries. The need for improved data on fisher behaviour for management of recreational fisheries can be addressed by leveraging external information from available datasets. We recommend that the temporal gap between surveys should be less than 5 years, supplemented by analysing behavioural information collected from fishers during interviews.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"32 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141641854","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":"Modeling food web and fisheries dynamics in Lake Baringo, Kenya","authors":"Jacques Riziki Walumona,&nbsp;Boaz Kaunda-Arara,&nbsp;Cyprian Ogombe Odoli,&nbsp;Pascal Masilya Mulungula,&nbsp;Raburu Philip,&nbsp;Benjamin Nelson Kondowe,&nbsp;Nyakeya Kobingi,&nbsp;Mugo James Murakaru,&nbsp;Mbalassa Mulongaibalu,&nbsp;Fabrice Amisi Muvundja","doi":"10.1111/fme.12725","DOIUrl":"10.1111/fme.12725","url":null,"abstract":"<p>Lakes are important in supporting ecosystem services and livelihoods. However, their food webs and ecological functioning are continuously threatened by anthropogenic influences. Food web models have been widely used in studying trophodynamics, fisheries impacts, and ecological functioning of temperate lakes, but less often in Afrotropical lake systems. We used Ecopath mass-balanced trophic models annually in 1999, 2010, and 2020 to assess trends in ecosystem function, and the impact of fisheries on the Lake Baringo Ecosystem, a shallow freshwater lake in Kenya. Pre-balance (PREBAL) and Pedigree analyses supplemented Ecopath models. Model input data were from field sampling, published and gray literature. Food web trophic models indicated a bottom-up grazer and detrital food chains in all 3 years. Odum's ecosystem development indicators (total productivity to total biomass and total respiration ratios; TPP/TB and TPP/TR) showed that the lake was in a low to intermediate developmental stage, with room for bio-manipulation, and a highly reduced mean transfer efficiency (TE) (6.4%–0.49%) indicated low trophic transfer of internal production. System omnivory (SOI) and connectance (CI) indices that varied among years indicated temporal variation in food web complexity. Indices of system resilience (overhead and ascendency) indicated an increasing potential for the lake to recover from perturbations. The mean trophic level of the catch (MTLc) increased from 1999 to 2010 and decreased in 2020, by fishing down the food chain as fishing pressure increased. <i>Oreochromis niloticus</i>, an endemic cichlid, was the keystone species (KSi &gt;0) controlling community structure, while the lungfish <i>Protopterus aethiopicus</i>, the top predator in the lake, was not a keystone species (KSi &lt;0). We recommend an integrated approach to lake management that incorporates watershed regulations, regulates fishing effort on the keystone species (<i>O. niloticus</i>), and monitors water quality for sustainable management of the Lake Baringo ecosystem.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141650479","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":"Ecosystem responses to a whole-reservoir coarse woody habitat addition","authors":"C. C. Fenstermacher,&nbsp;D. S. Radford,&nbsp;A. P. Porreca,&nbsp;G. G. Sass,&nbsp;J. J. Parkos III","doi":"10.1111/fme.12728","DOIUrl":"10.1111/fme.12728","url":null,"abstract":"<p>The addition of coarse woody habitat (CWH) is often used to mitigate the loss of natural structure in aging waterbodies. Ecosystem-scale effects of large-scale CWH additions and their influence on fish productivity have been assessed in oligotrophic, natural lakes, but need to be assessed in more ecosystems. Therefore, we tested the effects of an ecosystem-scale addition of CWH to a eutrophic reservoir using a reference reservoir and data from 4 years before and 4 years after habitat enhancement. Zooplankton and benthic macroinvertebrates did not respond to the addition of CWH, but bluegill (<i>Lepomis macrochirus</i>) reproductive productivity and largemouth bass (<i>Micropterus salmoides</i>) size structure increased. Positive fish responses that contrasted with a lack of fish population-level responses after a similar CWH addition in an oligotrophic, natural lake highlight the importance of assessing the efficacy of CWH addition across diverse ecosystems.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12728","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141610492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size-based indicators of unexploited deep-sea community in the Colombian Caribbean Sea","authors":"Jorge Paramo,&nbsp;Daniel Pérez","doi":"10.1111/fme.12720","DOIUrl":"10.1111/fme.12720","url":null,"abstract":"<p>Composition, size distribution, structure, and function of deep-sea marine communities must be understood before they are impacted by anthropogenic effects. The deep-sea ecosystem of the Colombian Caribbean Sea is unexploited with no fishing activity ever registered. We quantified the current state of the marine community using body size distribution (size-spectra), size-based indicators, minimum length (L_MIN), maximum length (L_MAX), average length (L_mean), standard deviation of length (L_SD), 10th and 90th percentiles of the length distribution, Shannon–Wiener diversity (<i>H</i>′), and Pielou's evenness (<i>J</i>′) to generate a baseline of potential ecological indicators that contribute to management and conservation of the Colombian bento-demersal community of deep-sea marine ecosystem. Sampling was in the Colombian Caribbean Sea at 58 stations during four samplings in August and December 2009, 21 stations in March and May 2010, and 45 stations from August to December 2020, using the swept area method, at depths of 200–550 m. Catches included &gt;50% families and species of fish, followed by 27 families (30%) and 33 and species (37%) of crustaceans. Chondrichthyes included 14% families and 9–11% species. Cephalopods included 2–3% families and 1–4% species. Size-spectra analysis confirmed expected values for unexploited communities in three sampling years for teleostei, crustacea, and whole community.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 5","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141575899","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":"Interacting effects of density and temperature on growth of wild and hatchery young-of-the-year anadromous brown trout (Salmo trutta L.)","authors":"Adam M. Lejk,&nbsp;Szymon Smoliński,&nbsp;Maksym Łaszewski,&nbsp;Grzegorz Radtke","doi":"10.1111/fme.12724","DOIUrl":"10.1111/fme.12724","url":null,"abstract":"<p>Stocking can affect population density but may influence fish growth responses to changes in environmental conditions. In a multi-year field experiment, we investigated the interactive effects of density and temperature on the growth of young-of-the-year anadromous brown trout in streams stocked with wild-origin hatchery-reared brown trout. Fish origin was the predominant factor influencing growth rate, thereby highlighting the importance of discriminating between wild and hatchery-reared individuals. Growth was positively related to temperature (degree-days) and negatively related to density, with the growth response to temperature modulated by density. Temperature had a more pronounced effect on juvenile growth at low density than at high density. The reduced growth response to temperature caused by density could reduce population resilience and should be considered in management and conservation strategies.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547166","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":"Effect of stocking on brown trout angling catch rates in the Czech Republic during 1996–2018","authors":"Luděk Šlapanský,&nbsp;Michal Janáč,&nbsp;Pavel Jurajda","doi":"10.1111/fme.12726","DOIUrl":"10.1111/fme.12726","url":null,"abstract":"<p>When investigating potential causes of apparent declines in European brown trout angling catch rates over recent decades, fisheries management procedures are rarely considered. Using a 20-year dataset of brown trout stocking and angling catch rates, we found a significant decline in brown trout angling catch rates in streams of East Bohemia, Czechia, were well predicted by a reduction in the number of brown trout stocked at catchable size (i.e. age-3+). Increased stocking of smaller sized brown trout, and recent sporadic efforts to stock large brown trout, had no effect on catch rates. Our findings suggest that brown trout catch rates were related to ‘put-and-take’ stocking, in which non-native rainbow trout gradually replaced brown trout in both stocking and catches. Our study stresses the importance of considering historical fisheries management, a sometimes-neglected factor, when studying angling catches of economically important species.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12726","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Collaborative research enhances selectivity in a lake fishery","authors":"Alfred Sandström,&nbsp;Johnny Norrgård,&nbsp;Thomas Axenrot,&nbsp;Henrik Ragnarsson-Stabo,&nbsp;Malin Setzer,&nbsp;Tomas Jonsson","doi":"10.1111/fme.12723","DOIUrl":"10.1111/fme.12723","url":null,"abstract":"<p>Size and species selectivity are crucial for developing sustainable fisheries. Our objective was to estimate the selectivity of whitefish fisheries in a large European lake through a collaboration of fishers, regional managers, and scientists. Fishers were given special permits to test, within a common framework and together with scientists, selectivity enhancement strategies adapted to their own experiences. Fishers and scientists jointly tested gillnets and pontoon traps and how fishing depth, soak time, fishing season, and mesh size were affected by bycatches of undersized fish of sensitive species. Results indicated that the selectivity of the fishery could be increased, particularly by targeting whitefish adjacent to spawning sites where spatiotemporal overlap with bycatch species was lower. Proposed changes to the fishery, such as new gear, would be costly initially but could become profitable over time due to a lower cost of handling bycatch. Our findings demonstrated that co-constructed knowledge can contribute to the governance of aquatic resources.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12723","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}