Fisheries Research最新文献_第2页

Stock identification of the striped mullet Mugil incilis (Actinopterygii: Mugilidae) using truss network, morphometric relationships, and probabilistic models in three regions of the Colombian Caribbean. 基于桁架网络、形态计量关系和概率模型的哥伦比亚加勒比地区条纹鲻种群鉴定（放线鱼科：鲻科）

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-23 DOI: 10.1016/j.fishres.2025.107642

K.E. Carrillo-Castro , P. del Monte-Luna , C. Cardenas-Uribe , y.H. Castillo-Navarro

The striped mullet Mugil incilis is an important fishery resource in the Colombian Caribbean, but its management has traditionally assumed a single uniform stock without empirical validation. This study evaluated phenotypic stock differentiation across three lagoon systems: Ciénaga Grande de Santa Marta (CGSM), Ciénaga de la Virgen (CVir), and Ciénaga de la Caimanera (CCera). A total of 196 individuals were collected (2023): 78 from CGSM (19.8–30.7 cm TL), 65 from CVir (17.0–37.8 cm TL), and 53 from CCera (17.5–30.0 cm TL). A truss network of 25 morphometric distances was standardized using allometric correction to eliminate ontogenetic effects. Multivariate analyses (PERMANOVA) revealed significant differences among lagoons, with pairwise comparisons confirming consistent separation. PERMDISP indicated that these differences were mainly due to body shape rather than within-group dispersion. Divergence was concentrated in three anatomical regions: cranial structures, trunk depth, and the mid-posterior/caudal peduncle, all related to feeding performance and swimming efficiency. SIMPER and univariate analyses identified these areas as the main contributors to stock differentiation. Classification models reinforced these findings: Flexible Discriminant Analysis achieved 86.9 % accuracy, while Multinomial Logistic Regression achieved 95 % accuracy with a pseudo-R² of 0.92. Both methods provided consistent evidence and strong predictive power, demonstrating the robustness of morphometric markers for stock discrimination. This is the first comprehensive evidence of at least three distinct M. incilis stocks in the Colombian Caribbean. Incorporating this differentiation into fisheries management is critical to reducing overexploitation risks and supporting sustainable strategies tailored to each lagoon’s specific dynamics.

条纹鲻鱼是哥伦比亚加勒比海地区重要的渔业资源，但其管理传统上假设单一统一的种群，没有经验验证。本研究评估了三个泻湖系统的表型种群分化：大圣玛尔塔（CGSM）、处女岛（CVir）和凯马纳拉岛（CCera）。共收集到196只（2023），其中CGSM(19.8 ~ 30.7 cm) 78只，CVir(17.0 ~ 37.8 cm) 65只，CCera(17.5 ~ 30.0 cm) 53只。使用异速校正消除个体发生效应，标准化了25个形态测量距离的桁架网络。多变量分析（PERMANOVA）揭示了泻湖之间的显著差异，两两比较证实了一致的分离。PERMDISP表明，这些差异主要是由于体型而不是组内分散。分化主要集中在三个解剖区域：颅骨结构、躯干深度和中后/尾柄，这些区域都与进食性能和游泳效率有关。SIMPER和单变量分析确定这些区域是种群分化的主要贡献者。分类模型强化了这些发现：灵活判别分析的准确率为86.9 %，而多项逻辑回归的准确率为95 %，伪r²为0.92。两种方法都提供了一致的证据和较强的预测能力，证明了形态计量标记对股票区分的稳健性。这是哥伦比亚加勒比海地区首次全面证据表明至少有三种不同的赤毛分枝杆菌种群。将这种差异纳入渔业管理对于减少过度开发风险和支持针对每个泻湖的具体动态量身定制的可持续战略至关重要。

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引用次数: 0

Fjord retention and dispersion of shrimp larvae (Pandalus borealis) in Northern Norway 挪威北部幼虾（Pandalus borealis）峡湾滞留和分散

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-22 DOI: 10.1016/j.fishres.2025.107639

Jofrid Skarðhamar , Anne Dagrun Sandvik , Pål Næverlid Sævik , Jon Albretsen , Guldborg Søvik

Larval drift connects sub-populations within metapopulations of species with long lasting pelagic larval phases, like northern shrimp (Pandalus borealis), which inhabits patches of soft bottom along the Norwegian coast. The key objective of this study was to investigate whether northern shrimp in Northern Norwegian fjords constitute distinct fjord-based sub-populations, or if they form a coherent coastal population due to advection of larvae along the coast and between fjords. Shrimp larval fluxes within and out of a Northern Norwegian fjord, Kvænangen, were studied with a particle tracking model combined with a high-resolution hydrodynamic model, and we estimated the retention of shrimp larvae released within the fjord and the export of larvae with the currents to neighbouring fjords. Kvænangen is an open fjord with a deep sill dividing the inner and outer fjord. The model particles, representing shrimp larvae, were given a temperature dependent development rate and a diurnal vertical swimming behaviour dependent on development stage. Larval drift was modelled for the years 2018–2021 to capture interannual variability of oceanographic conditions. The dispersal of shrimp larvae varied from local settlement within the fjord, to long range advection (>250 km) to other fjords downstream or farther to the Barents Sea. Within Kvænangen, more larvae settled in the inner fjord basins behind the sill than in the outer fjord. Shrimp in the inner fjord seem to constitute a self-sustained sub-population, while the population outside the sill lost most of its spawning products offshore and therefore relies on import from the inner fjord and upstream populations for recruits. These results have implications for the management of shrimp fisheries and how the management units of shrimp should be defined. Our findings are also relevant for management of the salmon aquaculture industry; since shrimp larvae disperse throughout Kvænangen, there is no place in the fjord where chemicals from delousing baths can be released without potentially harming shrimp larvae.

幼虫漂移将具有长期远洋幼虫期的物种的亚种群连接在一起，比如居住在挪威海岸软底的北方虾（Pandalus borealis）。本研究的主要目的是调查挪威北部峡湾的北方虾是否构成了独特的峡湾亚种群，或者它们是否由于沿海岸和峡湾之间的幼虫平流而形成了一个连贯的沿海种群。采用粒子跟踪模型结合高分辨率流体动力学模型，对挪威北部Kvænangen峡湾内外虾类幼虫通量进行了研究，并估计了峡湾内释放的虾类幼虫滞留量和随水流向邻近峡湾的虾类幼虫出口量。Kvænangen是一个开放的峡湾，深井将内外峡湾分开。模型粒子代表虾仔，给予温度依赖的发育速率和取决于发育阶段的日垂直游动行为。对2018-2021年的幼虫漂移进行了建模，以捕捉海洋条件的年际变化。虾幼虫的扩散从在峡湾内的局部定居到长途平流（250 公里）到下游的其他峡湾或更远的巴伦支海。在Kvænangen内，沉积在台地后的内峡湾盆地的幼虫比沉积在外峡湾的幼虫多。峡湾内的虾似乎构成了一个自我维持的亚种群，而峡湾外的种群仍然失去了大部分的近海产卵产品，因此依赖于从峡湾内和上游种群的进口来招募。这些结果对对虾渔业的管理和对虾管理单位的界定具有指导意义。我们的研究结果也与鲑鱼养殖业的管理有关；由于虾仔散布在整个Kvænangen，在峡湾没有任何地方可以释放除虱浴产生的化学物质而不可能伤害虾仔。

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引用次数: 0

A simple method to measure beam overlap in multibeam sonars using calibration spheres 一种利用标定球测量多波束声纳波束重叠的简单方法

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-22 DOI: 10.1016/j.fishres.2025.107636

Guillermo Boyra, Udane Martinez

In multibeam sonar systems, beam overlap introduces distortion in across-beam size measurements, leading to overestimation of target dimensions. A previously developed method estimated beam overlap by comparing along-beam and across-beam measurements of fish schools during purse seine maneuvers, demonstrating the presence of overlap and proposing a metric for its quantification. However, this approach required substantial effort and had limited precision on vertical swaths. In this study, we present a simplified and reproducible method for estimating beam overlap using standard calibration spheres commonly employed in fisheries acoustics. The procedure involves placing a sphere of known diameter at the center of a sonar beam. Provided the range is sufficient for the beam to fully encompass the target, the degree of overlap is estimated by counting the number of beams that detect the sphere. This method yielded results similar to the previous approach, while requiring considerably less effort. It can be performed nearshore in a few hours, and allows for overlap estimation in both horizontal and vertical planes with similar accuracy. The proposed technique offers a practical and efficient alternative for beam overlap calibration, facilitating its integration into standard acoustic calibration protocols.

在多波束声纳系统中，波束重叠导致了波束间尺寸测量的失真，导致目标尺寸的高估。先前开发的一种方法是通过比较围网操作期间鱼群的顺波束和跨波束测量来估计波束重叠，证明重叠的存在并提出量化的度量。然而，这种方法需要大量的努力，并且在垂直区域上精度有限。在这项研究中，我们提出了一种简化和可重复的方法来估计波束重叠使用标准校准球通常用于渔业声学。这个过程包括在声纳波束的中心放置一个已知直径的球体。如果距离足以使光束完全包围目标，则通过计算探测球体的光束的数量来估计重叠程度。这种方法产生的结果与前一种方法相似，但需要的努力要少得多。它可以在几个小时内在近岸进行，并且允许在水平和垂直平面上以相似的精度进行重叠估计。所提出的技术为波束重叠校准提供了一种实用而高效的替代方案，有助于将其集成到标准声学校准协议中。

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引用次数: 0

Biological traits of blackbellied angler (Lophius budegassa Spinola, 1807) in the central Adriatic Sea 亚得里亚海中部黑腹垂钓者（Lophius budegassa Spinola, 1807）的生物学特性

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-20 DOI: 10.1016/j.fishres.2025.107638

Fortunata Donato , Federico Calì , Carlotta Mazzoldi , Alberto Santojanni , Mario La Mesa

This study investigates some biological traits of the blackbellied anglerfish (Lophius budegassa) in the central Adriatic Sea, an area characterised by intense bottom trawling activity and high ecological importance. Reproductive parameters of the local population, such as sex ratio, gonado-somatic index, sexual maturity and fecundity were assessed by macroscopic and histological analyses of gonads, whereas age and somatic growth were estimated using illicium sections. The results revealed pronounced differences in size, growth, and maturation between sexes. Females attained significantly larger sizes and older ages than males, with asymptotic sizes of 73.0 cm and 43.2 cm and maximum ages of 15 and 6 years, respectively. Growth was negatively allometric for both sexes, whereas the condition factor was significantly higher in females, likely reflecting differing reproductive strategies and energy allocation patterns. Consistent with the marked dimorphism in size, size at first sexual maturity was markedly higher in females than in males. Histological and gonado-somatic analyses confirmed an extended spawning season from autumn through late spring, with peak reproductive activity of females in May and October. Females exhibited synchronous oocyte development, with total fecundity ranging from 82247 to 276332 oocytes/female and relative fecundity between 33–91 oocytes/g. These findings provide novel insights into the life history of L. budegassa in the central Adriatic Sea and contribute to a better understanding of its population structure and reproductive strategies. The information obtained is relevant for future stock assessments and the development of science-based management measures aimed at the sustainable exploitation of this commercially and ecologically important species.

本研究调查了亚得里亚海中部的黑腹琵琶鱼（Lophius budegassa）的一些生物学特性，该地区的特点是强烈的底拖网捕捞活动和高度的生态重要性。通过性腺的宏观和组织学分析来评估当地种群的生殖参数，如性别比、性腺-躯体指数、性成熟和繁殖力，而利用髂骨切片来估计年龄和躯体生长。结果显示，两性之间在大小、生长和成熟方面存在显著差异。女性的体型和年龄均明显大于男性，渐近体型分别为73.0 cm和43.2 cm，最大年龄分别为15岁和6岁。两性的生长均呈负异速生长，而雌性的条件因子明显更高，可能反映了不同的生殖策略和能量分配模式。与尺寸上明显的二态性一致，雌性在性成熟初期的尺寸明显高于雄性。组织学和性腺-体细胞分析证实了从秋季到晚春的产卵季节延长，雌性的繁殖活动高峰在5月和10月。雌性卵母细胞发育同步，总繁殖力在82247 ~ 276332个卵母细胞/g之间，相对繁殖力在33 ~ 91个卵母细胞/g之间。这些发现提供了对亚得里亚海中部budegassa生活史的新认识，有助于更好地了解其种群结构和繁殖策略。所获得的资料对今后的种群评估和制定以科学为基础的管理措施是有关的，目的是可持续地开发这种具有商业和生态重要性的物种。

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引用次数: 0

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