Fisheries Research最新文献_第5页

How fishing regulations, free time, seasonality and angler characteristics shape daily fishing pressure and angling success: Insights from Czech recreational fisheries 捕鱼法规、空闲时间、季节性和垂钓者特征如何影响日常捕鱼压力和钓鱼成功：来自捷克休闲渔业的见解

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-19 DOI: 10.1016/j.fishres.2025.107600

David Boukal , Roman Lyach , Jan Kubečka

Recreational fishing is a widespread leisure activity and an important source of fish mortality. Angler behaviour affects fishing pressure, but the causes of seasonal patterns of fishing pressure and success remain poorly understood. We used data from > 565,000 individual daily fishing trips in the three largest fishing areas in Czechia during three years to decipher the seasonal patterns of fishing pressure and success, including possible differences between angler groups defined by their proximity to the fishing area (‘local’, ‘regional’ and ‘distant’) and by the target fish based on their annual catches (anglers reporting no catches and those focussing on carp or predatory fish and generalists). We found that total fishing pressure was predictably seasonal in each area, showing a broadly unimodal pattern that peaked around week 30 and increased during weeks with short public holidays. Fishing pressure of the different angler groups responded differently to the open fishing season for predatory fish (16 June to 31 December each year), with the strongest positive effect found among anglers who focussed on predatory fish or who reported no catches from the three areas. Daily fishing success fluctuated throughout the season and varied greatly between anglers. Individual success declined with daily fishing pressure and increased with the angler’s total effort when anglers reporting no catches were included in the analysis. We also detected area- and year-specific differences in the individual success of both distance-based and catch-based angler groups, as well as area- and year-specific effects of the open fishing season for predatory fish on the individual success of catch-based angler groups. While seasonal patterns of fishing pressure were similar across years in each fishing area, our analysis identified area-specific patterns of short-term fishing pressure and individual success that could indicate shifts in angler preferences or possible overfishing. Overall, we show that external factors such as fishing regulations and public holidays directly influence the seasonality of fishing pressure and indirectly modulate the success of individual anglers. Our approach may pave the way for more detailed analyses of fine-scale temporal dynamics in recreational fisheries.

休闲钓鱼是一项广泛的休闲活动，也是鱼类死亡的重要原因。垂钓者的行为会影响捕鱼压力，但捕鱼压力和成功的季节性模式的原因仍然知之甚少。我们使用了来自>； 的数据，在三年中，在捷克三个最大的捕鱼区，每天有565,000个人钓鱼，以破译捕鱼压力和成功的季节性模式，包括钓鱼者群体之间的可能差异，这些差异是由他们与捕鱼区（“本地”，“区域”和“遥远”）的接近程度定义的，以及根据他们的年渔获量定义的目标鱼（钓鱼者报告没有渔获，那些专注于鲤鱼或掠食性鱼和通才）。我们发现，每个区域的总捕捞压力具有可预测的季节性，呈现出大致的单峰模式，在第30周左右达到峰值，并在公共假期较短的几周内增加。在每年6月16日至12月31日的开放捕食性鱼类季节，不同垂钓者群体的渔获压力有不同的反应，其中以捕食性鱼类为主的垂钓者或报告在这三个地区没有渔获的垂钓者的积极影响最强。每天的捕鱼成功率在整个季节波动，钓鱼者之间差异很大。个人成功随每日捕鱼压力的下降而下降，当分析中包括未捕获的垂钓者时，随垂钓者总努力的增加而增加。我们还发现了以距离为基础和以渔获为基础的垂钓者群体的个体成功在区域和年份上的差异，以及开放捕鱼季节对以渔获为基础的垂钓者群体的个体成功的区域和年份特异性影响。虽然每个渔区每年的季节性捕捞压力模式相似，但我们的分析确定了特定区域的短期捕捞压力模式和个体成功，这可能表明垂钓者偏好的变化或可能的过度捕捞。总体而言，我们发现钓鱼法规和公共假期等外部因素直接影响钓鱼压力的季节性，并间接调节个体垂钓者的成功。我们的方法可能为更详细地分析休闲渔业的精细尺度时间动态铺平道路。

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引用次数: 0

Response by Ryznar and Litzow to the letter to the editor by Webster and Gauvin 雷兹纳尔和利佐对韦伯斯特和高文给编辑的信的回应

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-19 DOI: 10.1016/j.fishres.2025.107572

Emily R. Ryznar, Michael A. Litzow

引用次数: 0

Reproductive indicators highlight the need to revise the biological closure of southern hake (Merluccius australis Hutton, 1872) in Chilean Patagonia 生殖指标强调有必要修改智利巴塔哥尼亚南部鳕鱼（Merluccius australis Hutton, 1872）的生物闭合

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-19 DOI: 10.1016/j.fishres.2025.107606

Andrés Flores , Rodrigo Wiff , Renato Céspedes , Manuel E. Martínez González

Biological closures are essentials for the conservation and management of many harvested fish species. In Chile, most fish species are managed using biological closures; however, many of these closures lack comprehensive and up-to-date analyses of life history traits, as is the case for southern hake (Merluccius australis), which is harvested in Patagonia by industrial and artisanal fleets in oceanic waters and fjords, respectively. A closure to protect spawning fish in August was established in 1996 based solely on data from oceanic waters. However, local fisher knowledge and recent investigations suggest spawning in fjords later in the year. Therefore, it is important to compare the maturity status of southern hake between the two areas to assess the effectiveness of the current closure. The main objective of this study was to analysis reproductive indicators for southern hake. We assessed sexual maturity and the gonadosomatic index using machine learning and generalized additive models. Results indicate that the reproductive season of southern hake occurs with a time lag between exterior and interior waters, peaking in July and September, respectively. The proportion of mature females at a given size also varied between areas, with a shift toward smaller sizes in interior waters comparatively. These analyses reveal that the current closure does not adequately protect the reproductive activity of this species in either area. We propose two alternatives: a closure in different months for each area or a closure from June to October for all of Chilean Patagonia. Possible effects of both proposals on ecological, economic, and social aspects were discussed.

生物封禁是保护和管理许多捕捞鱼类的必要条件。在智利，大多数鱼类都采用生物封闭管理；然而，许多这些关闭缺乏对生活史特征的全面和最新的分析，就像南鳕（Merluccius australis）的情况一样，南鳕分别由工业船队和手工船队在巴塔哥尼亚海域和峡湾捕捞。1996年8月，仅根据海洋水域的数据，就建立了一个保护产卵鱼类的关闭。然而，当地渔民的知识和最近的调查表明，今年晚些时候在峡湾产卵。因此，比较两地区南部鳕鱼的成熟状况，对评估当前封育的有效性具有重要意义。本研究的主要目的是分析南方鳕的繁殖指标。我们使用机器学习和广义相加模型评估性成熟和性腺指数。结果表明，南鳕的繁殖季节在外水和内水之间存在时间差，分别在7月和9月达到繁殖高峰。相同大小的成熟雌鱼的比例在不同地区也有所不同，相对而言，内陆水域的雌鱼体型较小。这些分析表明，目前的关闭并没有充分保护该物种在这两个地区的生殖活动。我们提出两个备选方案：每个地区在不同的月份关闭，或智利巴塔哥尼亚所有地区在6月至10月关闭。讨论了这两项建议在生态、经济和社会方面可能产生的影响。

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引用次数: 0

Using acoustic telemetry to inform standardisation of catch rates from passive fishing gear: A case study using dusky flathead (Platycephalus fuscus) 利用声波遥测技术为被动渔具捕获率的标准化提供信息：以暗头平头鱼为例研究

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-18 DOI: 10.1016/j.fishres.2025.107603

Hayden T. Schilling , James A. Smith , Daniel E. Hewitt , Alistair Becker , Charles Gray , Geoffrey Liggins , Nicholas L. Payne , Dylan van der Meulen , Matthew D. Taylor

Estuaries are dynamic ecosystems and the species which inhabit them often support important commercial, recreational and indigenous fisheries. Catch rate standardisations are an essential component of many contemporary stock assessments, yet these standardisation processes often do not incorporate environmental variability and its influence on catchability. Here, we use acoustic tagging to quantify the relationship between environmental variation and small-scale, within-estuary, movement rates of dusky flathead (Platycephalus fuscus), a key fishery species in New South Wales (NSW), Australia. These relationships were then included as environmentally-mediated proxies for catchability in the standardisation of commercial mesh (gill) net catch rates. The case study showed that the probability of movement increased with freshwater inflow and varied across the lunar cycle. The effect of freshwater inflow was reflected in the commercial catch data of five estuaries, with greater catches of dusky flathead correlated with higher freshwater inflow, including one of the estuaries in which fish were acoustically tagged. Incorporating environmental effects (such as freshwater inflow) into catch standardisations of the five estuaries did not alter the overall trajectory of the time series but there were differences of up to 50.9 % (mean 12.3 %, SD 10.2 %) in the standardised index values in some years. Additionally, the study also found that large-scale weather drivers correlate with small biases in abundance indices when environmental conditions were excluded from standardisation processes. These results highlight the value of biological information and ecological experiments (including acoustic tracking studies) for validating assumptions in the broader stock assessment process such as how environmental variables may be influencing catchability or availability/density.

河口是动态的生态系统，栖息在其中的物种往往支持重要的商业、娱乐和土著渔业。渔获率标准化是许多当代鱼类种群评估的重要组成部分，但这些标准化过程往往不包括环境变化及其对渔获能力的影响。在这里，我们使用声学标记来量化环境变化与小尺度，河口内，暗平头鱼（Platycephalus fuscus）的运动速率之间的关系，暗平头鱼是澳大利亚新南威尔士州（NSW）的重要渔业物种。然后将这些关系作为商业网（刺网）捕捞率标准化中可捕捞性的环境中介代理纳入其中。案例研究表明，移动的可能性随着淡水流入而增加，并且在整个月球周期中有所不同。淡水流入的影响反映在五个河口的商业捕捞数据中，更多的黑平头鱼捕捞量与更高的淡水流入相关，包括一个对鱼类进行声学标记的河口。将环境影响（如淡水流入）纳入5个河口的捕捞标准化并没有改变时间序列的总体轨迹，但标准化指数值在某些年份的差异高达50.9 %（平均12.3 %，标准差10.2 %）。此外，该研究还发现，当环境条件被排除在标准化过程之外时，大规模天气驱动因素与丰度指数的小偏差相关。这些结果突出了生物信息和生态实验（包括声学跟踪研究）在验证更广泛的种群评估过程中的假设方面的价值，例如环境变量如何影响可捕性或可得性/密度。

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引用次数: 0

Incorporating spatiotemporal structure to improve the understanding of Antarctic krill (Euphausia superba) distribution 结合时空结构提高对南极磷虾分布的认识

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-17 DOI: 10.1016/j.fishres.2025.107604

Xiuxia Mu , Xinliang Wang , Chongliang Zhang , Xianyong Zhao , Jichang Zhang , Yunxia Zhao , Yiping Ying , Gangzhou Fan , Lu Liu , Jiancheng Zhu , Qingchang Xu

Antarctic krill (Euphausia superba) is a keystone species in the Southern Ocean, and plays critical roles in the ecosystem through its spatial dynamics. To balance conservation and sustainable harvesting of this species, a revised management framework has been proposed, requiring precise krill distribution data. However, conventional species distribution models (SDMs) often fail to capture spatiotemporal autocorrelation, compromising their statistical integrity and predictive performance. This study focuses on providing the latest distribution information of Antarctic krill and examining how spatiotemporal structure affects the predictability of SDMs. We compared the performance of three SDMs fitted using the sdmTMB framework: a baseline model without random effects (non-spatial), a model incorporating spatial random effects (spatial), and a spatiotemporal model with spatiotemporal random effects (spatiotemporal), using 2013–2020 summer acoustic surveys near the South Shetland Islands. Cross-validated results revealed substantial performance disparities: the non-spatial model showed minimal explanatory power (R²=0.161), the spatial model demonstrated slight improvements (R²=0.165), while the spatiotemporal model achieved superior performance (R²=0.348). Salinity and year were identified as important predictors across all model formulations, while current velocity was a significant predictor in both the non-spatial and spatial models, but not in the spatiotemporal model. The estimated effects of these covariates changed when spatial and spatiotemporal random fields were incorporated. Model projections suggest a slight southward shift in krill distribution centroids. This study advocates for the integration of spatiotemporal structure into SDMs to support ecosystem-based management, offering insights for implementing spatially adaptive fisheries strategies in the rapidly changing Antarctic environment.

南极磷虾（Euphausia superba）是南大洋的重要物种，其空间动态在南大洋生态系统中起着至关重要的作用。为了平衡该物种的保护和可持续捕捞，已经提出了一个修订的管理框架，需要精确的磷虾分布数据。然而，传统的物种分布模型（SDMs）往往无法捕捉时空自相关性，从而影响其统计完整性和预测性能。本研究的重点是提供南极磷虾的最新分布信息，并研究时空结构如何影响SDMs的可预测性。利用2013-2020年南设得兰群岛附近的夏季声学调查，我们比较了使用sdmTMB框架拟合的三种sdm的性能：不含随机效应（非空间）的基线模型、包含空间随机效应（空间）的模型和具有时空随机效应（时空）的时空模型。交叉验证结果显示，非空间模型的解释能力最小（R²=0.161），空间模型的解释能力略有提高（R²=0.165），而时空模型的解释能力更强（R²=0.348）。盐度和年份在所有模式中都被认为是重要的预测因子，而流速在非空间和空间模式中都是重要的预测因子，但在时空模式中则不是。当纳入空间随机场和时空随机场时，这些协变量的估计效应发生了变化。模式预测显示磷虾分布中心点有轻微的向南移动。本研究主张将时空结构整合到sdm中，以支持基于生态系统的管理，为在快速变化的南极环境中实施空间适应性渔业战略提供见解。

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引用次数: 0

Impact of long-term fisher awareness programs on sea turtle conservation in Kalpitiya, Sri Lanka 长期渔民意识项目对斯里兰卡Kalpitiya海龟保护的影响

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-15 DOI: 10.1016/j.fishres.2025.107597

R.M. Pabasara Abeywickrama , E.M. Lalith Ekanayake , Rupika S. Rajakaruna

High mortality of discarded bycatch remains a major concern in marine fisheries worldwide. Even though the Fauna and Flora Protection Ordinance (FFO) has protected sea turtles since 1972 in Sri Lanka, bycatch is a significant yet least understood threat to the sea turtle populations. Since the mid-1990s, non-governmental organisations have conducted over 50 awareness programs in the Kalpitiya Divisional Secretariat Division (DSD) to create awareness of sea turtle conservation practices and legislation among the fisher community. This study assessed the impact of these programs on sea turtle conservation in the Kalpitiya DSD. A questionnaire survey was conducted in 12 fishing villages in Kalpitiya, selecting participants and non-participants of the awareness programs. Data were collected between May to September 2023 from 100 fishers. During the interview, the participants were asked a series of questions related to their demographic information, fishing activities, and their knowledge, attitudes, and practices regarding sea turtle bycatch. The awareness programs resulted in a significant positive influence on the knowledge and attitudes (Chi-square test, p < 0.001) towards sea turtle conservation among the fisher community. Participants demonstrated a greater understanding of turtle species, their biology, the causes of bycatch, and the legal frameworks for their conservation. They also exhibited a positive attitude towards the importance of reducing turtle bycatch and conserving these species compared to non-participants. However, awareness programs did not affect their fishing practices (Fisher’s exact test, p > 0.05), such as changing gear types or strategies to reduce sea turtle bycatch, etc. Fishers’ reluctance to adopt new methods stemmed partly from poverty concerns and fear of decreased harvests. To enhance the efficacy of future awareness programs, we recommend providing fishers with conservation approaches that need not compromise their livelihoods.

废弃副渔获物的高死亡率仍然是全世界海洋渔业的一个主要问题。尽管《动植物保护条例》（FFO）自1972年以来一直在斯里兰卡保护海龟，但附带捕捞对海龟种群构成了重大威胁，但人们对这一威胁知之甚少。自20世纪90年代中期以来，非政府组织在Kalpitiya分部秘书处（DSD）开展了50多个提高认识项目，以提高渔民社区对海龟保护措施和立法的认识。本研究评估了这些项目对Kalpitiya DSD海龟保护的影响。在Kalpitiya的12个渔村进行了问卷调查，选择了意识项目的参与者和非参与者。数据收集于2023年5月至9月期间，来自100名渔民。在访谈中，参与者被问及一系列与他们的人口统计信息、捕鱼活动以及他们对海龟兼捕的知识、态度和做法有关的问题。意识项目对渔民社区海龟保护的知识和态度产生了显著的积极影响（卡方检验，p <； 0.001）。参加者对海龟的种类、生物学、兼捕的原因和保护海龟的法律框架有了更深入的了解。与非参与者相比，他们也对减少兼捕海龟和保护这些物种的重要性表现出积极的态度。然而，提高意识的项目并没有影响他们的捕鱼行为（Fisher的确切测试，p >； 0.05），比如改变渔具类型或减少海龟副捕获的策略等。渔民不愿采用新方法的部分原因是对贫困的担忧和对收成减少的恐惧。为了提高未来意识项目的有效性，我们建议向渔民提供不损害其生计的保护方法。

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引用次数: 0

A risk analysis approach for assessing stock recovery of exploited low-mobility marine invertebrates vulnerable to localized extinction 局部濒危低流动性海洋无脊椎动物资源恢复评估的风险分析方法

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-15 DOI: 10.1016/j.fishres.2025.107601

Ricardo A. Morris, Alvaro Hernández-Flores

Low-mobility density-dependent marine invertebrate fisheries are facing the threat of collapse and failed recovery due to unprecedented exploitation, environmental change, and inadequate management. The main challenge for managers is to identify and maintain crucial density-dependent population structures to foster resilience and the recovery of stocks facing collapse. Using the Jamaican queen conch Aliger gigas stock as a case study, a spatial bioeconomic risk assessment approach with 1000 Monte Carlo simulations was used to model alternative stock recovery scenarios and assess the probability or risk of achieving a long-term recovery trajectory for spatial key bioeconomic indicators – fishing effort, catch, biomass, and profitability. The ratio of the effective spawning stock to total adults was used as an indicator to account for the main density-dependent effects – the Allee effect and source-sink dynamics – and the proportion of spawning-age adults contribute to future recruitment – the effective spawning stock. When this ratio was less than 0.39, all source patches decreased in size and number, increasing the risk of recruitment failure, and dynamic trajectories tended toward collapse. For our case study, this limit reference point (LRP) corresponded to a total adult biomass of 606 tons, a high 41 % risk of falling below this LRP, and a relatively low 59 % probability of recovery. Among the recovery simulations, those with effort control and spatial management improved all indicators and increased the probability of stock maintenance and recovery up to 0.50. Holistic strategies that consider the technical and institutional capacities and the inherent uncertainties of these stocks will be crucial for recovery.

由于前所未有的开发、环境变化和管理不足，依赖低流动性密度的海洋无脊椎动物渔业正面临崩溃和恢复失败的威胁。管理人员面临的主要挑战是确定和维持关键的依赖于密度的人口结构，以促进面临崩溃的种群的恢复和恢复。本研究以牙买加大尾螺（Aliger gigas）种群为例，采用空间生物经济风险评估方法，通过1000次蒙特卡罗模拟，对种群恢复的备选方案进行建模，并对空间关键生物经济指标（渔获量、渔获量、生物量和盈利能力）实现长期恢复轨迹的概率或风险进行评估。有效产卵量与总成虫的比值被用作一个指标，用来说明主要的密度依赖效应——Allee效应和源库动态——以及产卵年龄成虫对未来补充的贡献比例——有效产卵量。当该比值小于0.39时，所有源斑块的大小和数量减小，增加了招募失败的风险，动态轨迹趋于崩溃。在我们的案例研究中，这个极限参考点（LRP）对应于606吨的总成虫生物量，低于这个LRP的风险高达41% %，恢复的可能性相对较低，为59% %。在恢复模拟中，具有努力控制和空间管理的模拟提高了所有指标，提高了种群维持和恢复的概率，达到0.50。考虑到这些库存的技术和体制能力以及固有的不确定性的整体战略对恢复至关重要。

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引用次数: 0

Spawning stock recovery of Pacific bluefin tuna (Thunnus orientalis): Evidence from length, age and catch data of Taiwanese longline fishery in 2010–2023 太平洋蓝鳍金枪鱼（Thunnus orientalis）产卵种群恢复：来自2010-2023年台湾延绳钓渔业长度、年龄和捕捞数据的证据

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-14 DOI: 10.1016/j.fishres.2025.107602

Yu-Wen Lin , Yi-Jay Chang , Jhen Hsu , Owyn E. Snodgrass , Travis Richards , Jen-Chieh Shiao

Pacific bluefin tuna (Thunnus orientalis, PBF), a highly migratory and commercially important species, faces intense fishing pressure. Taiwanese PBF catches, which reached a nadir in 2012, gradually increased from 2014 onwards, culminating in a dramatic fivefold surge after 2019. This study analyzed the adult population from PBF landings in Taiwan from 2010 to 2023 to inform fisheries management. We found a strong correlation between declining juvenile catches in Japanese troll or purse seine fishery and increasing adult catches in Taiwanese and Japanese longline fishery, with a 7–9 year lag. Age estimation, using otolith annuli and age-length keys, revealed a temporal shift in age composition. Despite the substantial increase in Taiwanese catch size, the average age of landed PBF decreased. The spawning stock, previously dominated by older individuals (14–18 years), now primarily consisted of younger fish (8–12 years). Prior to 2014, most PBF measured between 220 and 240 cm in fork length; after 2017, this range generally decreased to 200–220 cm. Permutation test using fish size and otolith direct ageing data suggested a lower mean fork length at age for the PBF landed in the recent years compared to earlier years. Furthermore, a linear mixed model showed a relationship between fork length and fishing year, indicating a consistent decrease in fork length across all age groups. These results suggest that reduced fishing pressure on juvenile PBF (0–1 years old) has allowed more individuals to reach adulthood, contributing to the observed recovery of the spawning population. These findings provide valuable insights into the effective fishery management and PBF stock rebuilding in Taiwan and other regions.

太平洋蓝鳍金枪鱼（Thunnus orientalis， PBF）是一种高度洄游和具有重要商业价值的物种，面临着巨大的捕捞压力。台湾PBF捕获量在2012年达到最低点，从2014年开始逐渐增加，在2019年之后达到了惊人的5倍增长。本研究分析2010年至2023年台湾PBF上岸的成年种群，为渔业管理提供参考。研究发现，日本巨网或围网渔业的幼鱼捕获量下降与台湾和日本延绳钓渔业的成鱼捕获量增加之间存在较强的相关性，且存在7-9年的滞后。使用耳石环和年龄长度键进行年龄估计，揭示了年龄组成的时间变化。尽管台湾渔获量大幅增加，但上岸PBF的平均年龄却有所下降。产卵种群以前以年龄较大的个体（14-18岁）为主，现在主要由年龄较小的鱼类（8-12岁）组成。在2014年之前，大多数PBF的叉长在220 - 240 cm之间；2017年以后，这个范围普遍下降到200-220 cm。利用鱼的大小和耳石直接老化数据进行的排列测试表明，近年来着陆的PBF在年龄上的平均叉长比早些年要低。此外，线性混合模型显示了叉长与捕捞年份之间的关系，表明所有年龄组的叉长都一致减少。这些结果表明，对幼鱼（0-1岁）的捕捞压力的减少使更多的个体达到成年，有助于观察到产卵种群的恢复。这些发现为台湾及其他地区的有效渔业管理和PBF种群重建提供了有价值的见解。

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引用次数: 0

Ghost fishing catch estimates based on annual retrieval operations in Norwegian waters 根据挪威水域每年的回收作业估算幽灵捕鱼的捕获量

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-14 DOI: 10.1016/j.fishres.2025.107599

Dorian Vodopia , Francesca Verones , Cecilia Askham , Roger B. Larsen

Ghost fishing, the incidental capture of marine organisms by abandoned, lost and discarded fishing gear (ALDFG), poses a significant threat to marine ecosystems and biodiversity. Yet, comprehensive data on the ghost fishing catch in Norwegian waters, remains largely unavailable. To contribute to filling this data gap, we analyzed data from seven years (2018–2024) of retrieval operations targeting commercial derelict fishing gear. The ghost fishing catch consisted predominantly of Greenland halibut (Reinhardtius hippoglossoides), Northeast Arctic cod (Gadus morhua), edible crab (Cancer pagurus), red king crab (Paralithodes camtschaticus), and snow crab (Chionoecetes opilio). Additionally, cetaceans, elasmobranchs, and a pinniped were caught. In Norwegian waters, reported gillnet losses result in yearly ghost fishing catches of 566 tons under the best-case scenario, 990 tons under the intermediate scenario, and 3723 tons under the worst-case scenario. Generalized linear mixed effects models (GLMMs) indicated a significant reduction in ghost fishing catch at retrieval in derelict king crab pots following the introduction of escape mechanisms. This study highlights the substantial biomass and biodiversity loss in the Norwegian marine environment caused by ALDFG, impacting both commercially valuable and endangered species. It also documents the effectiveness of escape mechanisms in reducing ghost fishing catch in derelict pots.

幽灵捕鱼是指被遗弃、丢失和丢弃的渔具偶然捕获海洋生物，对海洋生态系统和生物多样性构成重大威胁。然而，关于挪威海域幽灵渔获量的全面数据在很大程度上仍然无法获得。为了填补这一数据空白，我们分析了针对商业废弃渔具的7年（2018-2024）检索操作的数据。鬼渔主要包括格陵兰大比目鱼（Reinhardtius hippoglossoides）、东北北极鳕鱼（Gadus morhua）、食用蟹（Cancer pagurus）、红王蟹（Paralithodes camtschaticus）和雪蟹（Chionoecetes opilio）。此外，还捕获了鲸类、板鳃类和鳍状目动物。在挪威水域，报告的刺网损失导致最佳情况下每年的幽灵捕捞量为566吨，中间情况下为990吨，最坏情况下为3723吨。广义线性混合效应模型（glmm）表明，引入逃逸机制后，在废弃的帝王蟹笼中回收幽灵渔获量显著减少。这项研究强调了aldgf在挪威海洋环境中造成的大量生物量和生物多样性损失，影响了商业价值和濒危物种。报告还记录了逃脱机制在减少废弃渔池的幽灵渔获量方面的有效性。

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引用次数: 0

In the weeds: Aquatic macrophytes serve as important indicators of walleye recruitment in Upper Midwestern lakes 在杂草中：水生大型植物是中西部上游湖泊中眼鱼招募的重要指标

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-14 DOI: 10.1016/j.fishres.2025.107595

Robert P. Davis , Ellen A. Albright , Catherine L. Hein , Michael R. Verhoeven , Heidi M. Rantala , Zachary S. Feiner

Aquatic macrophytes provide important habitat in lakes for fish at various life stages and can influence fish population characteristics such as growth and size structure. Even though macrophytes are considered to be important to fish communities, the exact nature of the relationship is not well understood. Walleye are a culturally and economically important species to the Upper Midwest that are currently experiencing declines in recruitment success due to climate change and other factors. In this study, we tested for relationships between aquatic macrophyte community characteristics and walleye recruitment success. Point-intercept macrophyte surveys from Minnesota and Wisconsin were used to quantitatively describe plant communities in lakes spanning 2004–2021 and fall electrofishing recruitment surveys were used to quantify walleye recruitment during the same time period. A random forest model explained ∼31 % of the variation in walleye recruitment across 359 lake-years. Analyses revealed that vegetated littoral area (%) had a negative relationship with walleye recruitment. This relationship was driven in part by the increased frequency of year classes without recruitment as littoral vegetation increased. Other important variables included lake area (ha) and littoral area (%). An NMDS ordination showed that plant communities were not strongly structured and had little to no relationship to the success/failure of walleye recruitment. Overall, our study highlights interactions that may exist between macrophytes and walleye recruitment and provides evidence that macrophytes should be considered in the management of walleye fisheries.

水生植物在湖泊中为鱼类的各个生命阶段提供了重要的栖息地，并能影响鱼类的生长和大小结构等种群特征。尽管人们认为大型植物对鱼类群落很重要，但这种关系的确切性质尚不清楚。Walleye是中西部地区重要的文化和经济物种，由于气候变化和其他因素，目前正在经历捕捞成功率下降。在本研究中，我们测试了水生大型植物群落特征与黄眼鱼招募成功之间的关系。来自明尼苏达州和威斯康星州的点截式大型植物调查用于定量描述2004-2021年间湖泊中的植物群落，并使用秋季电捕鱼招募调查来量化同期的白眼招募。随机森林模型解释了359个湖泊年期间眼孔雀鱼招募变化的~ 31% %。分析表明，沿海植被面积（%）与白眼鱼的增加呈负相关。这种关系的部分原因是，随着沿海植被的增加，没有招聘的学年班增加了。其他重要变量包括湖泊面积（ha）和沿岸面积（%）。NMDS排序结果表明，植物群落结构不强，与黄眼鱼招募的成败关系不大，甚至没有关系。总的来说，我们的研究强调了大型植物与白眼鱼繁殖之间可能存在的相互作用，并提供了在白眼鱼渔业管理中应考虑大型植物的证据。

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