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Balancing boat-electrofishing sampling effort against costs for nearshore fish communities in the Toronto waterfront, Lake Ontario 平衡安大略湖多伦多海滨近岸鱼类群落的渔船电鱼取样工作与成本之间的关系
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-08-09 DOI: 10.1111/fme.12733
Sebastian Theis, Angela Wallace, Brian Graham, Brynn Coey, Lyndsay Cartwright, Mark Poesch, Rick Portiss, Jonathan L. W. Ruppert

To enhance management of aquatic systems, long-term monitoring programs are crucial. However, managers often lack sufficient guidance in decision-making. In this study, we analyzed nearshore electrofishing data from Lake Ontario spanning 18 years and over 100,000 caught fish to assess sampling designs for various coastal habitats. Using simulation, we evaluated precision of catch per unit effort (CPUE) for all species, piscivores, and specialist species, at different levels of electrofishing sampling effort. For overall CPUE in any habitat type, increased precision declined with additional electrofishing runs, particularly after reaching 30–40 runs. Adjustments in sampling effort, such as adding 10 runs per year for open-coast sites, increased precision of overall CPUE by 10%. Adding 8 runs per year for wetlands increased precision of specialist-species CPUE by 10%. However, additional runs in embayments did not increase precision for all species, piscivores, or specialist species. Our findings underscore the importance of considering community composition and abundance when evaluating CPUE precision and illustrates a flexible approach to optimize sampling effort in aquatic monitoring programs.

为了加强对水生系统的管理,长期监测计划至关重要。然而,管理者往往缺乏足够的决策指导。在这项研究中,我们分析了安大略湖 18 年来的近岸电鱼数据和超过 10 万条捕获的鱼类,以评估各种沿岸生境的取样设计。通过模拟,我们评估了在不同的电鱼取样强度下,所有物种、食鱼类和专门物种的单位努力量捕获量(CPUE)的精度。对于任何生境类型中的总体 CPUE,随着电鱼次数的增加,精度的提高会下降,特别是在达到 30-40 次之后。调整取样力度,例如在开阔海岸地点每年增加 10 次取样,CPUE 的总体精度提高了 10%。在湿地每年增加 8 次取样,可使特殊物种 CPUE 的精确度提高 10%。然而,在堤坝增加运行次数并没有提高所有物种、食鱼类或专门物种的精确度。我们的发现强调了在评估 CPUE 精度时考虑群落组成和丰度的重要性,并说明了在水生监测计划中优化取样工作的灵活方法。
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引用次数: 0
Optimal mesh size of traps for marbled flounder (Pseudopleuronectes yokohamae) based on biological and economic factors 基于生物和经济因素的大比目鱼(Pseudopleuronectes yokohamae)最佳诱捕网目尺寸
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-31 DOI: 10.1111/fme.12730
Myungsung Koo, Inyeong Kwon

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 (Pseudopleuronectes yokohamae) 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.

渔具选择性在渔业管理中至关重要,因为它影响捕捞鱼类的大小和种类,传统方法通常根据目标鱼种的成熟长度确定最佳网目尺寸。然而,为了确保渔业的可持续发展,必须同时考虑资源保护的生物方面和捕鱼作业的效率。本研究旨在利用生物和经济因素,确定在韩国庆尚南道诱捕大比目鱼(Pseudopleuronectes yokohamae)的理想网目尺寸,以实现可持续渔业管理。我们对不同网目尺寸(35、50、65、80 和 100 毫米)的诱捕器中捕获的鱼进行了取样,并根据鱼的成熟度、副渔获物比率和 CPUE 建立了两个模型。模型 1 采用 17.8 厘米的成熟度标准,模型 2 采用 20 厘米的法定最小长度限制。网目选择性曲线表明,仅根据最小成熟体长 17.8 厘米,最佳网目尺寸为 50-65 毫米。相比之下,基于生物和经济因素的最佳网目尺寸为 57.5-90 毫米。我们的研究结果可指导决策者通过网目尺寸和渔具限制的政策调整来加强大理石鲽的种群管理策略。
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引用次数: 0
Sorting grid usage to reduce the catch of undersized narrow-clawed crayfish (Pontastacus leptodactylus Eschscholtz, 1823) in fyke net fisheries 使用分选网格减少在刺网渔业中捕获尺寸过小的窄爪小龙虾(Pontastacus leptodactylus Eschscholtz, 1823)的数量
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-31 DOI: 10.1111/fme.12731
Mehmet Cilbiz, Celalettin Aydın

Sustainability of natural stocks of crayfish is critical because of their economic and ecological importance. Crayfish (Pontastacus leptodactylus), 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 (L50) (±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.

由于小龙虾在经济和生态方面的重要性,其自然种群的可持续性至关重要。小龙虾(Pontastacus leptodactylus)是土耳其内陆渔业中最重要的物种之一,最近却面临着严重威胁。该物种面临的一个威胁是,由于使用选择性渔具(如耙网),上岸的小龙虾尺寸过小,因此误捕率很高。我们估算了不同条间距的小龙虾分拣网格的尺寸选择性,以减少误捕。六种条间距(15.0、17.5、20.0、22.5、25.0 和 30.0 毫米)与商业小龙虾耙网一起进行了测试。15.0 毫米条距的平均选择性(L50)(±95% CI)为 6.90(6.63-6.99)厘米,17.5 毫米为 7.52(7.16-8.02)厘米,20.0 毫米为 8.52(8.32-8.71)厘米,30.0 毫米为 9.70(9.28-9.90)厘米。在这些参数中,小尺寸标本所占比例最大。通过使用分拣格栅,捕捞到的尺寸不足的标本比例从商业耙网的 32.27% 降至 2.46%。条间距为 22.5 毫米的鳕鱼网具选择性更强,丢弃率明显降低,对超过最小保护参考尺寸的个体比商业刺网更有效。
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引用次数: 0
Climate change effects on abundance and distribution of the European eel in Türkiye 气候变化对土耳其欧洲鳗鱼数量和分布的影响
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-31 DOI: 10.1111/fme.12732
Burcu Mestav, Şükran Yalçın Özdilek, Zahide Acar, Kemal Gökkaya, Nurbanu Partal

Spatial and temporal distribution of European eel (Anguilla anguilla) 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.

利用 1967-2020 年期间欧洲鳗鲡的时空分布情况,建立了欧洲鳗鲡分布对气候变异的响应模型。建模综合了两个不同模型的预测结果进行推断。首先,利用多重时间序列回归分析对温度和降水量与欧洲鳗鱼捕获量之间的关系进行建模,结果表明气候变量对图尔基耶的鳗鱼分布有影响。1967 至 2020 年间,鳗鱼捕获量开始局限于土耳其西部和南部海岸,总捕获量有所下降。从 1967 年到 2020 年,图尔基耶适宜欧洲鳗鱼生长的气候条件是温度适中。此外,对 2050 年和 2070 年的预测表明,土耳其将失去适宜的栖息地。我们的研究结果表明,迫切需要立即广泛实施有效的保护政策,以减轻对土耳其和全球欧洲鳗鱼的威胁。
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引用次数: 0
Modeling food web and fisheries dynamics in Lake Baringo, Kenya 肯尼亚巴林戈湖食物网和渔业动态建模
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-14 DOI: 10.1111/fme.12725
Jacques Riziki Walumona, Boaz Kaunda-Arara, Cyprian Ogombe Odoli, Pascal Masilya Mulungula, Raburu Philip, Benjamin Nelson Kondowe, Nyakeya Kobingi, Mugo James Murakaru, Mbalassa Mulongaibalu, Fabrice Amisi Muvundja

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. Oreochromis niloticus, an endemic cichlid, was the keystone species (KSi >0) controlling community structure, while the lungfish Protopterus aethiopicus, the top predator in the lake, was not a keystone species (KSi <0). We recommend an integrated approach to lake management that incorporates watershed regulations, regulates fishing effort on the keystone species (O. niloticus), and monitors water quality for sustainable management of the Lake Baringo ecosystem.

湖泊在支持生态系统服务和生计方面非常重要。然而,它们的食物网和生态功能不断受到人为影响的威胁。食物网模型已被广泛用于研究温带湖泊的营养动力学、渔业影响和生态功能,但较少用于非洲热带湖泊系统。我们在 1999 年、2010 年和 2020 年每年都使用 Ecopath 质量平衡营养模型来评估生态系统功能的变化趋势以及渔业对肯尼亚浅水淡水湖巴林戈湖生态系统的影响。预平衡(PREBAL)和世系分析对 Ecopath 模型进行了补充。模型输入数据来自实地采样、出版文献和灰色文献。食物网营养模型显示,3 年中都存在自下而上的食草动物和碎屑食物链。奥杜姆生态系统发展指标(总生产力与总生物量和总呼吸量之比;TPP/TB 和 TPP/TR)显示,该湖处于中低发展阶段,有生物操纵的余地,平均转移效率(TE)(6.4%-0.49%)高度降低,表明内部生产的营养转移较低。不同年份的系统杂食性(SOI)和连通性(CI)指数不同,表明食物网的复杂性随时间而变化。系统恢复力指数(开销指数和上升指数)表明,湖泊从扰动中恢复的潜力在增加。渔获量的平均营养级(MTLc)从 1999 年到 2010 年有所增加,到 2020 年则有所减少,原因是随着捕捞压力的增加,渔获量向食物链下游移动。湖中特有的慈鲷 Oreochromis niloticus 是控制群落结构的关键物种(KSi >0),而湖中的顶级捕食者肺鱼 Protopterus aethiopicus 则不是关键物种(KSi <0)。我们建议采用综合方法进行湖泊管理,其中包括流域管理条例、对基石物种(黑线鳕)的捕捞强度进行监管以及监测水质,以实现巴林戈湖生态系统的可持续管理。
{"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}
引用次数: 0
Ecosystem responses to a whole-reservoir coarse woody habitat addition 生态系统对整个水库增加粗木质生境的反应
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-12 DOI: 10.1111/fme.12728
C. C. Fenstermacher, D. S. Radford, A. P. Porreca, G. G. Sass, J. J. Parkos III

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 (Lepomis macrochirus) reproductive productivity and largemouth bass (Micropterus salmoides) 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.

增加粗木质生境(CWH)通常用于缓解老化水体中自然结构的损失。大规模增加粗木质生境的生态系统尺度效应及其对鱼类生产力的影响已在寡营养的天然湖泊中进行了评估,但还需要在更多的生态系统中进行评估。因此,我们利用一个参照水库和生境改善前 4 年和改善后 4 年的数据,测试了在一个富营养化水库中以生态系统规模添加 CWH 的影响。浮游动物和底栖大型无脊椎动物对增加 CWH 没有反应,但蓝鳃鱼(Lepomis macrochirus)的生殖生产力和大口鲈鱼(Micropterus salmoides)的体型结构有所增加。鱼类的积极反应与在一个寡营养的天然湖泊中添加类似的 CWH 后鱼类种群水平缺乏反应形成了鲜明对比,这突显了评估在不同生态系统中添加 CWH 的有效性的重要性。
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引用次数: 0
Size-based indicators of unexploited deep-sea community in the Colombian Caribbean Sea 哥伦比亚加勒比海未开发深海群落的尺寸指标
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-07 DOI: 10.1111/fme.12720
Jorge Paramo, Daniel Pérez

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 (LMIN), maximum length (LMAX), average length (Lmean), standard deviation of length (LSD), 10th and 90th percentiles of the length distribution, Shannon–Wiener diversity (H′), and Pielou's evenness (J′) 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 >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.

深海海洋群落的组成、大小分布、结构和功能必须在受到人为影响之前就了解清楚。哥伦比亚加勒比海的深海生态系统未经开发,从未有过捕鱼活动记录。我们利用体型分布(size-spectra)、基于体型的指标、最小长度(LMIN)、最大长度(LMAX)、平均长度(Lmean)、长度标准偏差(LSD)、长度分布的第 10 和第 90 百分位数来量化海洋生物群落的现状、这些指标有助于哥伦比亚深海海洋生态系统的管理和保护。2009 年 8 月和 12 月在哥伦比亚加勒比海的 58 个站点进行了四次采样,2010 年 3 月和 5 月在 21 个站点进行了采样,2020 年 8 月至 12 月在水深 200-550 米的 45 个站点进行了采样,采用的是掠区法。渔获物包括 50%的鱼科和鱼种,其次是甲壳类的 27 个科(30%)和 33 个种(37%)。软骨鱼类包括 14% 的科和 9-11% 的种。头足类包括 2-3% 的科和 1-4% 的种。尺寸谱分析证实了三个采样年未开发群落的预期值,包括远洋类、甲壳类和整个群落。
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引用次数: 0
Interacting effects of density and temperature on growth of wild and hatchery young-of-the-year anadromous brown trout (Salmo trutta L.) 密度和温度对野生和孵化年幼溯河褐鳟(Salmo trutta L.)生长的交互影响
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-04 DOI: 10.1111/fme.12724
Adam M. Lejk, Szymon Smoliński, Maksym Łaszewski, Grzegorz Radtke

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.

放养会影响种群密度,但也可能影响鱼类对环境条件变化的生长反应。在一项多年的野外实验中,我们研究了密度和温度对溪流中人工繁殖的野生溯河褐鳟鱼幼鱼生长的交互影响。鱼的来源是影响生长率的主要因素,因此突出了区分野生和孵化饲养个体的重要性。生长与温度(度-日)呈正相关,与密度呈负相关,生长对温度的反应受密度的调节。低密度时温度对幼鱼生长的影响比高密度时更明显。密度导致对温度的生长反应减弱,可能会降低种群的恢复能力,在管理和保护策略中应加以考虑。
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引用次数: 0
Effect of stocking on brown trout angling catch rates in the Czech Republic during 1996–2018 1996-2018 年间放养对捷克共和国褐鳟垂钓捕获率的影响
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-04 DOI: 10.1111/fme.12726
Luděk Šlapanský, Michal Janáč, Pavel Jurajda

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.

在调查近几十年来欧洲褐鳟垂钓捕获率明显下降的潜在原因时,很少考虑渔业管理程序。利用褐鳟放养和垂钓捕获率的 20 年数据集,我们发现,捷克东波西米亚溪流中褐鳟垂钓捕获率的显著下降,可以很好地预测可捕大小(即 3 岁以上)褐鳟放养数量的减少。增加投放较小规格的褐鳟鱼以及最近零星投放大型褐鳟鱼对捕获率没有影响。我们的研究结果表明,褐鳟鱼的捕获率与 "放养 "有关,在 "放养 "过程中,非本地虹鳟鱼逐渐取代了褐鳟鱼的放养量和捕获量。我们的研究强调,在研究具有重要经济价值的垂钓渔获量时,考虑历史渔业管理这个有时被忽视的因素非常重要。
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引用次数: 0
Collaborative research enhances selectivity in a lake fishery 合作研究提高了湖泊渔业的选择性
IF 2 3区 农林科学 Q2 FISHERIES Pub Date : 2024-07-04 DOI: 10.1111/fme.12723
Alfred Sandström, Johnny Norrgård, Thomas Axenrot, Henrik Ragnarsson-Stabo, Malin Setzer, Tomas Jonsson

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.

尺寸和物种选择性对于发展可持续渔业至关重要。我们的目标是通过渔民、地区管理者和科学家的合作,估算欧洲一个大型湖泊中白鲑渔业的选择性。渔民获得了特别许可,可以在一个共同框架内与科学家一起测试根据自身经验调整的选择性增强策略。渔民和科学家共同测试了刺网和浮箱诱捕器,以及捕捞深度、浸泡时间、捕捞季节和网目尺寸对捕获敏感鱼种中尺寸过小鱼类的影响。结果表明,渔业的选择性可以提高,特别是以产卵地点附近的白鲑为目标,因为那里与副渔获物种的时空重叠度较低。建议对渔业进行的改变(如新渔具)在初期成本较高,但随着时间的推移,由于处理副渔获物的成本降低,可能会有利可图。我们的研究结果表明,共同构建的知识有助于水生资源的治理。
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Fisheries Management and Ecology
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