Fisheries Research最新文献_第4页

Influence of gear type, release method, and injury on immediate and delayed mortality of Chinook salmon (Oncorhynchus tshawytscha) captured and released from a marine recreational fishery 渔具类型、放生方式和伤害对海洋休闲渔场捕获和放生的大戟鲑鱼即时和延迟死亡的影响

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-20 DOI: 10.1016/j.fishres.2025.107637

Kaitlyn R. Zinn , Stephen D. Johnston , Quin V.A. Johnston , Arthur L. Bass , Lance A. Weber , Scott G. Hinch

Capture and release (CR) is a management strategy increasingly employed in Pacific salmon (Oncorhynchus spp.) recreational fisheries to help balance management objectives of stock conservation and sustainable harvest. Although sustainability is contingent upon low post-release mortality, CR post-release mortality in marine recreational salmon fisheries has rarely been estimated and the underlying mechanisms are not well understood. We angled Chinook salmon (O. tshawytscha) using approaches typical for the fishery, then transported fish to ocean-side tanks for 10-day observations. Angling treatments included hook type (barbless; single vs. treble), lure type (bait vs. artificial), in-line flasher use (yes vs. no), and release approach (gaff-release vs. no gaff-release). Treble hooks were associated with poor survival in small fish (37 % survival for fish < 60 cm). Immediate mortality (< 2 h after capture) occurred in 8.4 % of Chinook salmon, and was associated with bleeding, sea surface temperature, fork length, transfer time, and the inner mouth hook location. There was little mortality until day-3, then mortality increased to day-5, and was associated with high levels of bleeding, fin damage, vessel transfer, scale loss, fork length, gill impairment, and sex. Fish with minor injuries had 74 % higher survival to the end of the holding period than those with high levels of bleeding, scale loss, and fin damage. Post-release mortality of Chinook salmon in the marine recreational fishery can be minimized through improved fish handling and release practices, specifically by not using treble hooks, avoiding small fish, and releasing fish at the water line without the use of a net.

捕获和释放（CR）是一种越来越多地用于太平洋鲑鱼（Oncorhynchus spp.）休闲渔业的管理策略，以帮助平衡种群保护和可持续收获的管理目标。虽然可持续性取决于释放后的低死亡率，但海洋休闲鲑鱼渔业的释放后CR死亡率很少得到估计，其潜在机制也没有得到很好的理解。我们使用渔业的典型方法钓出奇努克鲑鱼（O. tshawytscha），然后将鱼运送到海边的水箱中进行为期10天的观察。垂钓处理包括鱼钩类型（无刺；单钩或双钩），诱饵类型（诱饵或人工），在线闪光器使用（有或没有），以及释放方法（释放鱼钩或不释放鱼钩）。在小鱼中，高音鱼钩的存活率较低（60 cm的鱼存活率为37% %）。8. %的奇努克鲑鱼立即死亡（捕获后2 小时），与出血、海面温度、叉长、转移时间和内口钩位置有关。在第3天之前几乎没有死亡率，然后死亡率增加到第5天，并且与大量出血、鳍损伤、血管转移、鳞片脱落、叉长、鳃损伤和性别有关。轻微受伤的鱼在保存期结束时的存活率比那些大量出血、鳞片脱落和鳍损伤的鱼高74% %。在海洋休闲渔业中，奇努克鲑鱼放生后的死亡率可以通过改进鱼的处理和放生方法来降到最低，特别是不使用高音钩，避开小鱼，在不使用渔网的情况下在水线处放生。

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引用次数: 0

A sound check on compliance: Acoustically detected vessel presence indicates variation in behavior across marine protected areas 合规性的声音检查：声音检测船舶的存在表明海洋保护区的行为变化

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-18 DOI: 10.1016/j.fishres.2025.107635

Jessica A. McCordic , Rochelle M. Gordon , Logan R. Kline , Natalie K. Rivero , Sofie M. Van Parijs

Managers of marine protected areas rely on monitoring to effectively combat noncompliance. National Park Zones (NPZs) within Australian Marine Parks prohibit fishing and other extractive activities, but some are located in remote areas and present a variety of challenges to monitoring, including increased time and costs to maintain regular patrols. In this study, passive acoustic recorders were deployed in nine NPZs for between 19 and 84 days, providing a record of vessel presence within each NPZ. Models of acoustic transmission loss were estimated for each NPZ to determine the likelihood of acoustically detected vessels occurring within NPZ boundaries. Vessels determined to occur within the NPZs were further classified by acoustic characteristics to identify maneuvering vessels potentially exhibiting noncompliant behaviors. NPZs farther offshore showed lower presence overall and less consistent temporal patterns in activity. For NPZs closer to shore, daily presence was higher on weekdays later in the week, and hourly presence peaked during daylight hours, consistent with recreational boating activity. Inshore NPZs generally showed higher proportions of maneuvering vessels compared to NPZs that were farther offshore, but the detection of maneuvering vessels in offshore NPZs indicates the value of acoustic monitoring to capture infrequently occurring events indicative of noncompliance. The results from this observational study highlight the benefits of using passive acoustic monitoring to provide managers with an improved understanding of compliance across NPZs, allowing them to understand human use patterns and target enforcement efforts with increased efficiency.

海洋保护区的管理者依靠监测来有效地打击违规行为。澳大利亚海洋公园内的国家公园区（NPZs）禁止捕鱼和其他采掘活动，但一些位于偏远地区，给监测带来了各种挑战，包括增加时间和维持定期巡逻的成本。在这项研究中，被动式声波记录仪在9个NPZ中部署了19至84天，记录了每个NPZ内船舶的存在情况。估计了每个NPZ的声传输损失模型，以确定在NPZ边界内声学检测到船只的可能性。确定在npz内出现的船只通过声学特征进一步分类，以识别可能表现出不合规行为的机动船只。离岸较远的npz总体上表现出较低的存在，且活动的时间模式不太一致。对于靠近海岸的npz，在工作日的晚些时候，日存在率较高，每小时存在率在白天达到峰值，与休闲划船活动一致。与离岸较远的npz相比，近海npz中机动船只的比例普遍较高，但对近海npz中机动船只的检测表明，声学监测对于捕获指示不合规的不常见事件的价值。这项观察性研究的结果强调了使用被动声学监测的好处，它可以让管理人员更好地了解npz的合规性，使他们能够了解人类的使用模式，并以更高的效率瞄准执法工作。

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引用次数: 0

Accounting for selectivity is important when using fishery-dependent data to compare growth of Bight redfish (Centroberyx gerrardi) throughout its distribution in south-western Australia 当使用依赖渔业的数据来比较在澳大利亚西南部分布的红鱼（Centroberyx gerrardi）的生长时，考虑选择性是很重要的

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-16 DOI: 10.1016/j.fishres.2025.107632

Emily A. Fisher , S. Alex Hesp , Peter G. Coulson , Jeffrey V. Norriss , David V. Fairclough , Gary Jackson

Spatial variation in life history characteristics of fish species with extensive geographic ranges needs consideration for stock assessment and management. Additionally, traditional growth models can provide biased parameter estimates if fishing-related effects on length and age samples are not accounted for. This study of the commercially and recreationally important berycid Centroberyx gerrardi in southern Australia explored implications, for growth estimation, of selectivity and fishing mortality effects across three regions in Western Australia. Using length-at-age data derived from commercial line catches, taken from a large depth range and comprising a wide age range (5–84 years), traditional von Bertalanffy growth models indicated regional differences in growth. These estimated regional differences became reduced when von Bertalanffy growth models were fitted using informative priors to constrain some growth parameters to feasible values. In contrast, a length and age-based catch curve model (LACC) that simultaneously estimates growth, selectivity and fishing mortality indicated no regional growth differences. A simulation study confirmed that, among the three alternative growth models, the LACC is most reliable for estimating growth of C. gerrardi when data for small and young fish are limited. The lengths at which C. gerrardi become selected by commercial line fishing differed among regions, potentially reflecting a size-related, westward movement of fish along the south coast to important spawning areas. Different potential conclusions regarding growth and connectivity for C. gerrardi, depending on which growth model was applied, highlight the importance of considering fishing-related effects when estimating growth of exploited fish species.

具有广泛地理分布范围的鱼类生活史特征的空间变异需要在种群评估和管理中加以考虑。此外，如果不考虑捕捞对长度和年龄样本的影响，传统的生长模型可能会提供有偏差的参数估计。本研究对澳大利亚南部具有重要商业和娱乐价值的柏树科植物杰拉德Centroberyx gerrardi进行了研究，探讨了西澳大利亚三个地区的选择性和捕捞死亡率影响对生长估计的影响。传统的von Bertalanffy生长模型利用从大深度范围和大年龄范围（5-84岁）的商业渔获量获得的年龄数据，表明了生长的区域差异。当使用信息先验来拟合von Bertalanffy增长模型以约束一些增长参数为可行值时，这些估计的区域差异就减小了。相比之下，同时估计生长、选择性和捕捞死亡率的基于长度和年龄的捕捞曲线模型（LACC）显示没有区域生长差异。一项模拟研究证实，在三种可供选择的生长模型中，当小鱼和幼鱼的数据有限时，LACC最可靠地估计了杰拉德鱼的生长。不同地区的商业钓线所选择的杰拉德鲷的长度不同，这可能反映了鱼类沿着南海岸向西移动到重要的产卵区。根据所采用的生长模型不同，对杰拉德鲷的生长和连通性可能得出不同的结论，这突出了在估计被捕捞鱼类生长时考虑捕捞相关影响的重要性。

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引用次数: 0

Implications of depensation on oyster recruitment, population collapse, restoration, and sustainable fisheries management 依赖对牡蛎繁殖、种群崩溃、恢复和可持续渔业管理的影响

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-16 DOI: 10.1016/j.fishres.2025.107627

Edward V. Camp , William Pine , William R. Casola , Emilee D. Benjamin , Chad Palmer , Kotryna Klizentyte , Kai Lorenzen

The Eastern oyster (Crassostrea virginica) creates reef structures that provide recruitment habitat for many animals, including juvenile oysters. Oyster declines motivate increased habitat restoration and harvest management changes, while infrequent recovery from these declines raises concerns of depensatory dynamics in oyster recruitment. Here we follow a proof-of-concept approach by combining previously published models into a simple simulation to assess alternative assumptions of oyster recruitment and their implications for population collapse, habitat restoration, and fishery management. We found four key results. First, oyster recruitment relationships that are consistent with observations and literature on oyster resilience, collapse potential, and restoration benefits imply depensation. Second, strong depensation may exist but be difficult to detect until population collapse. Third, recovery from collapse requires sufficient habitat restoration. Finally, our results showed that sustaining a robust oyster fishery following collapse and recovery is possible but likely would require full recovery to pre-collapse conditions, and more constrained harvest relative to pre-collapse. Overall, our findings align with a recent and growing literature suggesting depensation may exist in populations of habitat-forming organisms like oysters and provide practical advice for altering restoration and management.

东方牡蛎（Crassostrea virginica）创造的珊瑚礁结构为许多动物提供了招募栖息地，包括幼牡蛎。牡蛎的减少促使栖息地恢复和收获管理的变化，而这些减少的不频繁的恢复引起了对牡蛎补充依赖动态的关注。在这里，我们采用概念验证方法，将先前发表的模型结合到一个简单的模拟中，以评估牡蛎繁殖的替代假设及其对种群崩溃、栖息地恢复和渔业管理的影响。我们发现了四个关键结果。首先，牡蛎的补充关系与有关牡蛎恢复力、崩溃潜力和恢复效益的观察和文献一致，这意味着依赖。其次，强烈的依赖性可能存在，但在人口崩溃之前很难发现。第三，从崩溃中恢复需要充分的栖息地恢复。最后，我们的研究结果表明，在崩溃和恢复之后，维持一个强大的牡蛎渔业是可能的，但可能需要完全恢复到崩溃前的条件，并且相对于崩溃前的收获更受限制。总的来说，我们的发现与最近越来越多的文献一致，表明依赖可能存在于牡蛎等栖息地形成生物的种群中，并为改变恢复和管理提供了实用的建议。

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引用次数: 0

Changes in fecundity and size at maturity of rock lobster Jasus edwardsii in southern New Zealand – A cause for concern in the face of environmental change 新西兰南部爱德华螯虾的繁殖力和成熟时大小的变化——面对环境变化，这是一个值得关注的问题

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-16 DOI: 10.1016/j.fishres.2025.107634

Lucy Coyle, Gaya Gnanalingam

Understanding reproductive parameters such as size at maturity (SAM) and fecundity is critical for the management of fished species as they are direct indicators of reproductive potential and therefore stock health. Rock lobster, Jasus edwardsii, support one of New Zealand’s most valuable inshore fisheries with commercial, recreational and customary significance. Reproduction in J. edwardsii is characterised by size-dependent fecundity, external brooding, and extended larval development, with regional variability in the timing of the reproductive period. This study assessed SAM and fecundity in female J. edwardsii from southern New Zealand, using fisheries-independent field data collected via standardised potting methods between 2021 and 2024. We found a 20 % decline in SAM compared to estimates from 1969. Also, while fecundity was higher across most sizes in 2024, the relationship between size and fecundity has changed since last measured in 1984. Our fecundity estimates utilised a traditional gravimetric approach, however we also trialled a non-invasive method for estimating fecundity and found no significant difference between the methods, supporting its utility for future monitoring with reduced impact on individuals. Results presented suggest that there has been a shift in key reproductive indicators over a 50-year period, which may have been driven by fishing pressure in a region where the commercial minimum legal size has remained low. These findings highlight the importance of shifting management strategies toward rebuilding reproductive capacity and population structure in a valuable fishery to ensure long-term persistence and enhance stock resilience into the future.

了解诸如成熟尺寸（SAM）和繁殖力等生殖参数对于鱼类的管理至关重要，因为它们是生殖潜力和种群健康的直接指标。岩龙虾，Jasus edwardsii，支持新西兰最有价值的近海渔业之一，具有商业，娱乐和习俗意义。J. edwardsii的繁殖特点是繁殖力大小依赖、外部孵育和延长幼虫发育时间，在繁殖期的时间上存在区域差异。本研究利用2021年至2024年间通过标准化盆栽方法收集的独立于渔业的野外数据，评估了新西兰南部雌性爱德华斑蝽的SAM和繁殖力。我们发现，与1969年的估计相比，SAM下降了20% %。此外，虽然2024年大多数尺寸的繁殖力都较高，但自1984年上次测量以来，尺寸和繁殖力之间的关系发生了变化。我们的繁殖力估计使用了传统的重力方法，但我们也尝试了一种非侵入性方法来估计繁殖力，发现两种方法之间没有显着差异，支持其在未来监测中的实用性，减少了对个体的影响。所提出的结果表明，在过去50年期间，关键的生殖指标发生了变化，这可能是由于在一个商业最小合法规模仍然很低的地区的捕捞压力所致。这些发现强调了将管理战略转向重建有价值渔业的繁殖能力和人口结构的重要性，以确保长期持续性并增强种群对未来的适应能力。

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引用次数: 0

Migration and spawning strategies of hilsa shad (Tenualosa ilisha, Clupeidae) in the Ayeyarwady River revealed by otolith chemistry 伊洛瓦底江地区鲥鱼的迁徙和产卵策略研究

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-15 DOI: 10.1016/j.fishres.2025.107628

An V. Vu , John Conallin , Zau Lunn , Nyein Chan , Maung Maung Lwin , Nyi Nyi Tun , Ian G. Cowx , Lee J. Baumgartner , Cameron M. Kewish , Michael Akester , Karin E. Limburg

Hilsa shad (Tenualosa ilisha) is an ecologically and economically important fish species in the Indo-Pacific region, yet its migration and spawning behaviour remains poorly in Myanmar. This study investigates hilsa migration and spawning strategies in the Ayeyarwady River using otolith chemistry, including elemental ratios (Sr:Ca, Ba:Ca, Mg:Ca, Mn:Ca) and ⁸⁷Sr:⁸⁶Sr isotope signatures. Otoliths from 101 juvenile and adult hilsa collected across the Ayeyarwady River Basin showed that 94 % of hilsa exhibited life histories consistent with anadromy (spawning in freshwater rivers but growing up in the ocean). However, a small subset (6 %) displayed alternative reproductive strategies, likely spawning in higher salinity environments (such as estuarine or coastal areas) without entering rivers. Additionally, hilsa may migrate over 1500 km to the Upper Ayeyarwady from the sea. Additionally, otoliths of juvenile hilsa collected in the Chindwin River, exhibited consistently low Sr:Ca ratios along the core-to-edge profiles, indicating prolonged freshwater residency post-hatching (up to six months). Findings from this study illustrate the predominance of an anadromous life history and the existence of an alternative reproductive strategy, which are essential for adaptive management and conservation of hilsa in Myanmar. Given the species’ trans-boundary distribution and importance in the Indo-Pacific region, effective fishery management requires strengthening regional cooperation to promote sustainable hilsa fisheries in the region.

Hilsa shad （Tenualosa ilisha）是印度太平洋地区重要的生态和经济鱼类，但其在缅甸的迁徙和产卵行为仍然很差。本研究利用耳石化学，包括元素比（Sr:Ca, Ba:Ca, Mg:Ca, Mn:Ca）和87Sr:86Sr同位素特征，研究了伊洛瓦底江中hilsa的迁移和产卵策略。在伊洛瓦底江流域收集的101只幼鱼和成鱼的耳石表明，94% %的幼鱼的生活史与雌雄同体（在淡水河流中产卵，在海洋中长大）一致。然而，一小部分（6 %）表现出替代的繁殖策略，可能在高盐度环境（如河口或沿海地区）产卵，而不进入河流。此外，hilsa可以从海上迁移1500 公里到上伊洛瓦底江。此外，在Chindwin河中收集的幼hilsa耳石沿核心到边缘剖面呈现出持续的低Sr:Ca比值，表明孵化后在淡水中居住的时间较长（长达6个月）。本研究的结果表明，在缅甸，雌雄同体的生活史占主导地位，并存在另一种生殖策略，这对希尔萨的适应性管理和保护至关重要。鉴于该物种的跨界分布及其在印度-太平洋地区的重要性，有效的渔业管理需要加强区域合作，以促进该地区可持续的希尔萨渔业。

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引用次数: 0

Comparison of treatments of natural mortality in integrated assessment models, with reference to fish stocks off southeast Australia: Towards best practices for estimation 综合评估模式中自然死亡率处理方法的比较，参照澳大利亚东南部海域的鱼类资源：探讨最佳估算做法

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-13 DOI: 10.1016/j.fishres.2025.107631

Andre E. Punt , Paul Burch , Kristin M. Privitera-Johnson , Pia Bessell-Browne , Geoffrey N. Tuck

Natural mortality (M) is a key parameter in age- and size-structured methods of fish stock assessment because estimates of biomass in absolute terms and relative to reference points are sensitive to its value. M can be pre-specified based on “indirect” methods, estimated with a prior, or estimated without a prior. However, there is an absence of best practice guidelines for how to treat M within stock assessments. Five alternative broad categories of methods for treating M in stock assessments (unconstrained estimation, estimation with a prior, the “lowest plausible” and “highest plausible” values based on indirect methods, and the results of the Hamel-Amax indirect method) are compared for ten stocks in Australia’s Southern and Eastern Scalefish and Shark Fishery using likelihood profiles, retrospective analyses and hindcast skill. There is no method that performs best in all cases. However, the results support a proposed best practice where estimation with a prior should be the default unless evidence such as diagnostics suggests that the population dynamics or the observation model is clearly and substantially mis-specified (e.g., an estimate of M that differs markedly from the mean of a prior based on longevity information) such that estimates of management-related quantities will likely be appreciably in error. It is also appropriate to conduct sensitivity analyses and use decision tables to highlight the effects of incorrectly assumed values of M when substantial mis-specification appears to be present and M is pre-specified using a longevity-based method.

自然死亡率(M)是鱼类种群年龄和大小结构评估方法中的一个关键参数，因为绝对生物量和相对于参考点的生物量估计数对其值很敏感。M可以基于“间接”方法预先指定，可以有先验估计，也可以没有先验估计。然而，对于如何在股票评估中处理M，缺乏最佳实践指南。对澳大利亚南部和东部鳞鱼和鲨鱼渔业的10个种群使用似然概况、回顾性分析和后验技能进行了比较，分析了种群评估中处理M的五种可选的大类方法（无约束估计、先验估计、基于间接方法的“最低似然”和“最高似然”值以及Hamel-Amax间接方法的结果）。没有一种方法在所有情况下都表现最好。然而，研究结果支持了一种建议的最佳实践，即除非诊断等证据表明种群动态或观测模型明显存在重大错误（例如，对M的估计与基于寿命信息的先验均值明显不同），否则，对管理相关数量的估计可能会出现明显的误差。当存在大量的错误规范时，也可以进行敏感性分析，并使用决策表来突出错误假设的M值的影响，并且使用基于寿命的方法预先指定M。

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引用次数: 0

Extending single-species maximum sustainable yield and precautionary approaches to account for species interactions 推广单物种最大可持续产量和预防措施，以考虑物种相互作用

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-12 DOI: 10.1016/j.fishres.2025.107626

Michael A. Spence, Thomas I.J. Bartos, Michael J. Thomson, Robert B. Thorpe

Many jurisdictions have a legal requirement to manage fish stocks at maximum sustainable yield (MSY), while following the precautionary approach (PA). Generally, MSY is calculated on a single-species basis; however, due to species interactions, there is no guarantee that fishing multiple stocks at their precautionary single-species MSY level will lead to all stocks being precautionary or even at fished MSY. This suggests the necessity of a multispecies MSY (MMSY). Although there are several definitions of MMSY, there is no agreed best definition. At least two approaches have been suggested, firstly a community maximum yield, either with or without integrated risk measures designed to prevent stock-depletion, and secondly, defining MMSY in terms of a set of simultaneous single-species MSYs. Here we adopt the second interpretation which allows for the implementation of MMSY without requiring new concepts when combined with multispecies PA to safeguard stock structure. We extend single-species definitions of MSY and PA to give two potential definitions of precautionary MMSY. In the first we constrain the search for MMSY to fishing mortalities that follow the multispecies PA and in the second we find the closest fishing mortality that follows the multispecies PA to the unconstrained MMSY. We demonstrate these definitions using a case study of 9 stocks in the North Sea and compare them with single-species and non-precautionary equivalents. We propose that the second definition be precautionary MMSY as it is more robust than the first.

许多司法管辖区都有法律要求，以最高可持续产量（MSY）管理鱼类种群，同时采取预防措施（PA）。一般来说，最高可持续产量是以单一物种为基础计算的；然而，由于物种之间的相互作用，不能保证以预防性的单一物种最高可持续产量水平捕捞多个种群将导致所有种群都处于预防性的最高可持续产量水平，甚至达到捕捞的最高可持续产量。这表明了多物种MSY （MMSY）的必要性。虽然MMSY有几个定义，但没有一个公认的最佳定义。至少提出了两种方法，第一种是群落最高产量，有或没有旨在防止种群枯竭的综合风险措施；第二种是根据一套同时的单一物种最高产量来定义最高产量。在这里，我们采用第二种解释，它允许在不需要新概念的情况下实施MMSY，并结合多物种PA来保护种群结构。我们扩展了MSY和PA的单物种定义，给出了预防性MMSY的两个潜在定义。在第一个模型中，我们将最适生存期的搜索限制为遵循多物种平均水平的捕捞死亡率，在第二个模型中，我们找到了最接近多物种平均水平的捕捞死亡率，最接近无约束的最适生存期。我们通过对北海9种鱼类的案例研究来证明这些定义，并将其与单一物种和非预防性等同物进行比较。我们建议第二个定义为预防性MMSY，因为它比第一个定义更健壮。

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引用次数: 0

Climate change threatens stability conferred by asynchronous coastwide recruitment of Atlantic striped bass, Morone saxatilis 气候变化威胁着大西洋条纹鲈鱼（Morone saxatilis）在整个海岸范围内的不同步捕捞所带来的稳定

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-12 DOI: 10.1016/j.fishres.2025.107629

Rachel L. Dixon, Mary C. Fabrizio, Piero L.F. Mazzini, Robert J. Latour

Contemporary fishery management approaches do not fully account for the spatial structuring evident in many populations. Yet, synchrony in recruitment among intrapopulation components may afford insights on population productivity and inform future management efforts. The coastal population of Atlantic striped bass (Morone saxatilis) is comprised of individuals from multiple distinct estuarine nurseries along the east coast of the United States, including Chesapeake Bay, Delaware River, and the Hudson River. The relative contribution of each producing area to the coastal population fluctuates annually, but the link between variable regional recruitment and the dynamics of the coastal population remains unexplored. Fishery-independent catch data of age-0 striped bass were used to generate time series of recruitment from each producing area from 1983 to 2021. Dynamic factor analysis was applied to identify common trends and the level of synchrony in recruitments, and investigate biotic and abiotic factors hypothesized to impact year-class strength and production in this species. Time series of recruitments were best represented by multiple common trends, highlighting asynchronous patterns in recruitment from individual producing areas. Two climate signals, the winter index of the North Atlantic Oscillation and marine heatwaves in the coastal ocean, had the largest impact on the observed patterns in recruitment. Differential production among individual producing areas may have conferred historical stability to the coastal population, but shared responses to broad scale stressors may indicate reduced resilience to climate impacts.

当代渔业管理方法没有充分考虑到许多种群中明显的空间结构。然而，在人口内部组成部分之间的同步征聘可能提供对人口生产力的见解，并为未来的管理工作提供信息。大西洋条纹鲈鱼（Morone saxatilis）的沿海种群由来自美国东海岸多个不同的河口托儿所的个体组成，包括切萨皮克湾、特拉华河和哈德逊河。每个生产地区对沿海人口的相对贡献每年都在波动，但不同区域征聘与沿海人口动态之间的联系仍未得到探讨。0岁条纹鲈鱼的非渔业捕捞数据用于生成1983 - 2021年各产区的捕捞时间序列。采用动态因子分析方法确定了采收的共同趋势和同步水平，并研究了生物和非生物因素对该物种年级强度和产量的影响。多个共同趋势最能代表招聘的时间序列，突出了各个产区招聘的异步模式。北大西洋涛动冬季指数和沿海海洋热浪两个气候信号对捕鲸过程中观测到的模式影响最大。个别产区之间的产量差异可能为沿海人口带来了历史稳定性，但对大范围压力源的共同反应可能表明对气候影响的适应能力降低。

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引用次数: 0

Life history and fishery of two sympatric squid species (Loligo vulgaris and L. forbesii) from the Western Mediterranean 西地中海两种同域鱿鱼（Loligo vulgaris和L. forbesii）的生活史和渔业

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-11 DOI: 10.1016/j.fishres.2025.107630

Antoni Quetglas, Aina de Mesa, Beatriz Guijarro, Enric Massutí, Francesc Ordinas, Núria Zaragoza, Maria Valls

In the Mediterranean, the squids Loligo vulgaris (LV) and L. forbesii (LF) are important fishing resources with high economic value, especially for the bottom trawl fishery. LV also constitutes an important target species for recreational and small-scale fisheries. In this work, several life-history traits (population structure, reproduction, condition), the bathymetric distribution and the fishery of these two squids were analysed using data collected during the last 20 years in the Western Mediterranean. The highest frequency of appearance was at 50–100 m depth for LV and at 200–350 m for LF. The overlap between the two squids was low, since they only co-occurred in 5 % of the sampling stations performed at their shared strata (50–200 m). The mean squid size and the percentage of mature individuals increased with depth in both species, pointing to an ontogenetic migration related to reproduction. In LF, females outnumbered males at 300–400 m, which might indicate that these are preferential spawning grounds. While reproduction of LV occurs all year round, it is mainly concentrated in a semester in LF. In the study area, where both species are sold together in a single commercial category, landings come from bottom trawl (66 %), small-scale (20 %), and purse-seine (14 %) fisheries. The catch per unit effort during the last 55 years showed a decreasing trend (1975–1998) followed by an increasing trend (1998–2023) as a result of important fishing effort variations. Squid landings were separated by species using fleet segmentation tools, which showed that the bulk of landings (84 %) belonged to LV.

在地中海，Loligo vulgaris （LV）和L. forbesii （LF）是重要的渔业资源，具有很高的经济价值，特别是对底拖网渔业来说。LV也是休闲和小规模渔业的重要目标物种。在这项工作中，使用过去20年在西地中海收集的数据，分析了这两种鱿鱼的几个生活史特征（种群结构，繁殖，条件），水深分布和渔业。lv50 - 100 m深度出现频率最高，LF 200-350 m深度出现频率最高。这两种鱿鱼的重叠度很低，因为它们只在它们共同地层（50-200 m）的5 %的采样站中同时出现。在这两个物种中，鱿鱼的平均大小和成熟个体的百分比随着深度的增加而增加，这表明与繁殖有关的个体发生迁移。在LF中，雌性在300-400 m处多于雄性，这可能表明这些地方是优先的产卵地。LV一年四季都有繁殖，而LF主要集中在一个学期。在研究区域，这两种鱼类作为单一的商业类别一起出售，捕捞来自底拖网（66% %），小规模（20% %）和围网（14% %）渔业。近55年单位渔获量呈现先减少后增加的趋势（1975-1998），这是重要渔获量变化的结果。利用船队分割工具对乌贼的上岸进行了种数划分，结果表明，大部分（84 %）的上岸属于LV。

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引用次数: 0