Marine and Coastal Fisheries最新文献_第3页

The use of conceptual ecological models to identify critical data and uncertainties to support numerical modeling: The northern Gulf of Mexico eastern oyster Crassostrea virginica example 利用概念生态模型确定关键数据和不确定因素，以支持数值建模：以墨西哥湾北部东部牡蛎 Crassostrea virginica 为例

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-08-05 DOI: 10.1002/mcf2.10297

Megan K. La Peyre, Shaye Sable, Danielle A. Marshall, Elise Irwin, Chad Hanson

Objective

Increasing reliance on numerical simulation models to help inform management and restoration choices benefits from careful consideration of critical early steps in model development. Along the northern coast of the Gulf of Mexico, the eastern oyster Crassostrea virginica fulfills important ecological and economic roles. Using the eastern oyster as an example, we draw on several recent frameworks outlining best practices for model development and application for restoration, conservation, and management.

Methods

We identify priority model questions, outline a conceptual ecological model (CEM) to guide numerical model development, and use this framework to identify uncertainties and research needs.

Result

The CEM uses a nested design, identifying explicit vital rates, processes, attributes, and outcomes for the species (oysters), population, and metapopulation (i.e., network of populations) levels in response to drivers of species, population, and metapopulation changes and changing environmental factors. Most management actions related to oyster restoration and harvest affect population attributes directly, but many coastal management actions and changes (i.e., climate change and coastal and water resource engineering) impact environmental factors that alter vital rates and attributes of oysters, populations, and metapopulations.

Conclusion

Investment in studies targeting individual oyster- and population-level multi-stressor responses (filtration, respiration, growth, and reproduction) and improving hydrodynamic and environmental models targeting drivers that influence metapopulation vital rates and attributes (i.e., connectivity and substrate persistence) would contribute to reducing uncertainties. Development of numerical models covering the entire oyster life cycle and connectivity of populations using hydrodynamic models of current and predicted conditions to provide key abiotic and biotic factors influencing larval movement, recruitment, and on-reef oyster vital rates would assist in balancing the goals of conservation, restoration, and fisheries management of this foundational estuarine species.

目标越来越多地依靠数值模拟模型为管理和恢复选择提供信息，这得益于对模型开发早期关键步骤的认真考虑。在墨西哥湾北部沿岸，东部牡蛎（Crassostrea virginica）发挥着重要的生态和经济作用。以东部牡蛎为例，我们借鉴了最近的几个框架，这些框架概述了用于恢复、保护和管理的模型开发和应用的最佳实践。方法我们确定了优先模型问题，概述了指导数值模型开发的概念生态模型（CEM），并使用该框架确定了不确定性和研究需求、种群和元种群变化的驱动因素以及不断变化的环境因素。大多数与牡蛎恢复和捕捞有关的管理措施会直接影响种群属性，但许多沿岸管理措施和变化（如气候变化、沿岸和水资源工程）也会直接影响种群属性、结论投资于针对牡蛎个体和种群水平的多胁迫反应（过滤、呼吸、生长和繁殖）的研究，以及针对影响种群生命速率和属性（即连通性和底质持久性）的驱动因素的水动力和环境模型的改进，将有助于减少不确定性。开发涵盖牡蛎整个生命周期和种群连通性的数值模型，使用当前和预测条件下的水动力模型，提供影响幼体运动、繁殖和礁上牡蛎生命率的关键非生物和生物因素，将有助于平衡这一河口基础物种的保护、恢复和渔业管理目标。

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引用次数: 0

Temporal and spatial patterns in population demography of Tilefish in the Gulf of Mexico 墨西哥湾金线鱼种群数量的时空模式

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-07-28 DOI: 10.1002/mcf2.10299

Greta J. Helmueller, Christopher D. Stallings, Steven A. Murawski, Linda A. Lombardi-Carlson

Objective

The objectives of this study were to compare population dynamics of Tilefish Lopholatilus chamaeleonticeps before and after the 2010 Deepwater Horizon (DWH) oil spill in the north-central Gulf of Mexico (GoM) as well as inside and outside the spill area in the western and southwestern GoM (off Mexico).

Methods

Due to the availability of prespill samples of Tilefish, we were able to evaluate growth, mortality, and condition factors during two time periods (2000–2009 versus 2011–2017). Samples were derived from commercial landings and research vessel surveys using demersal longline fishing gear.

Result

Although some von Bertalanffy growth parameters differed for fish caught before and after the spill within the spill area, confidence limits for predicted growth curves overlapped for ages >10, while predicted growth for ages <10 declined somewhat after the spill. Tilefish grew faster off Mexico than in the northern GoM. Total instantaneous mortality rates (Z), estimated from aggregate multi-year catch curves, were highest off Mexico (0.39 ± 0.05 SE), lowest in the western GoM outside the spill area (0.21 ± 0.03), and similar before and after the DWH spill within the spill zone (0.32 ± 0.02).

Conclusion

Although Z on the stock within the spill area apparently did not change, differences in fishing mortality may have compensated for changes in natural mortality. Because 90% of the fish that were aged after the spill were alive prior to the spill, their accumulated growth history may have masked postspill growth changes. As we are now 14+ years past the 2010 spill, comparisons of population dynamics from samples collected now and in the future may provide a clearer picture of the strength of incoming year-classes and the long-term implications of the spill on Tilefish populations.

本研究的目的是比较 2010 年深水地平线（DWH）漏油事件前后墨西哥湾（GoM）中北部以及墨西哥湾西部和西南部（墨西哥近海）漏油区域内外的金线鱼（Lopholatilus chamaeleonticeps）的种群动态。方法由于获得了漏油前的金线鱼样本，我们能够评估两个时间段（2000-2009 年和 2011-2017 年）的生长、死亡率和状态因子。结果虽然泄漏前后在泄漏区域内捕获的鱼类的一些 von Bertalanffy 生长参数不同，但预测生长曲线的置信区间在年龄 >10 时重叠，而预测年龄 <10 的生长在泄漏后有所下降。墨西哥近海的瓦虱鱼生长速度快于北戈尔诺-卡拉巴赫地区。根据多年总渔获量曲线估算的瞬时总死亡率（Z）在墨西哥近海最高（0.39 ± 0.05 SE），在泄漏区外的墨西哥湾西部最低（0.21 ± 0.03），在泄漏区内的 DWH 泄漏前后相近（0.32 ± 0.02）。由于 90% 的泄漏后老龄鱼在泄漏前还活着，它们累积的生长历史可能掩盖了泄漏后的生长变化。由于 2010 年泄漏事件已经过去了 14 年多，对现在和未来收集的样本进行种群动态比较，可能会更清楚地了解流入年级的强度以及泄漏事件对瓦氏鱼种群的长期影响。

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引用次数: 0

Spawning run estimates and phenology for an extremely small population of Atlantic Sturgeon in the Marshyhope Creek–Nanticoke River system, Chesapeake Bay 切萨皮克湾沼泽溪-南蒂科克河水系中极小种群大西洋鲟的产卵量估计值和物候学研究

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-07-02 DOI: 10.1002/mcf2.10292

Nicholas Coleman, Dewayne Fox, Ashlee Horne, Nathan J. Hostetter, John Madsen, Michael O'Brien, Ian Park, Chuck Stence, David Secor

Objective

Once thought to be extirpated from the Chesapeake Bay, fall spawning runs of Atlantic Sturgeon Acipenser oxyrinchus have been rediscovered in the Marshyhope Creek (MC)–Nanticoke River (NR) system of Maryland, United States. High recapture rates in past telemetry surveys suggested a small population in the two connected tributaries. This study aims to generate estimates of abundance and understand within system connectivity for spawning runs in 2020 and 2021.

Methods

Data from mobile side-scan sonar surveys and detections of acoustically tagged adults on stationary telemetry receivers were analyzed in an integrated model to estimate spawning season abundance and examine run timing and system connectivity for this population. An array of acoustic receivers was deployed throughout the MC–NR system to monitor the movement of tagged fish during the spawning run period from mid-August to late October. Side-scan sonar surveys were conducted weekly in September in an area of high spawner aggregation to generate count data on spawning run abundance.

Result

In 2020 and 2021, 32 (95% credible interval [CRI] = 23–47) and 70 (95% CRI = 49–105) Atlantic Sturgeon, respectively, used the MC–NR system. The lower estimate for 2020 coincided with an earlier end to the spawning run related to cooler September temperatures in that year.

Conclusion

In both years, high spawning run connectivity between MC and the upper NR was observed. Overall, run estimates supported previous hypotheses that the MC–NR system supports a very small population and that both MC and the upper NR serve as important areas for spawning activity.

目标大西洋鲟Acipenser oxyrinchus曾被认为已从切萨皮克湾灭绝，但在美国马里兰州的沼泽溪（MC）-南蒂科克河（NR）水系中重新发现了大西洋鲟的秋季产卵群。过去遥测调查中的高重捕率表明，这两条相连支流中的种群数量较少。本研究旨在估算该种群在 2020 年和 2021 年产卵期的丰度，并了解该种群在系统内的连通性。研究方法通过一个综合模型分析移动侧扫声纳调查数据和固定遥测接收器对声学标签成鱼的探测数据，以估算该种群在产卵期的丰度，并研究该种群的产卵时间和系统连通性。在整个 MC-NR 系统中部署了声学接收器阵列，以监测 8 月中旬至 10 月下旬产卵期被标记鱼类的活动情况。结果在 2020 年和 2021 年，分别有 32 条（95% 可信区间 [CRI] = 23-47）和 70 条（95% 可信区间 [CRI] = 49-105）大西洋鲟鱼使用 MC-NR 系统。2020 年的估计值较低，这与该年 9 月气温较低导致产卵期提前结束有关。总体而言，产卵潮估计值支持了之前的假设，即 MC-NR 系统支持一个非常小的种群，而 MC 和上游 NR 都是产卵活动的重要区域。

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引用次数: 0

Estuarine residency and habitat preferences of Atlantic Tripletail in the northwestern Gulf of Mexico 墨西哥湾西北部大西洋三疣梭子蟹的河口居住地和栖息地偏好

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-06-25 DOI: 10.1002/mcf2.10298

David Ushakow, Elliot Briell, Zachary Olsen, Joel Anderson, Leslie Hartman

Objective

The Atlantic Tripletail Lobotes surinamensis is a globally distributed subtropical and tropical fish species that inhabits estuaries throughout the northern Gulf of Mexico (GOM), particularly during warm months. Little is known about distribution and residency patterns within estuaries, as the species is rarely caught in the recreational fishery, and virtually no commercial fishery exists for the species in the GOM.

Methods

We used data from a long-term fishery-independent gill-net survey to model estuarine distribution throughout Texas and to relate environmental variables to the Atlantic Tripletail catch.

Result

Although there were no observable temporal trends in catch over the time series (1990–2022), the most recent 6 years included record catch in six of the 10 major Texas estuaries, possibly indicating a recent pulse in abundance. Catch throughout the time series was spatially aggregated in a small number of “hot spots” observed coastwide. Latitude was the best predictor of catch, although wind fetch and wind aspect (wind direction in relation to shoreline direction) were important predictors, and catch was highest near GOM inlets. The Texas Parks and Wildlife Department gill-net sampling program caught a range of Atlantic Tripletail between 171 and 880 mm total length, indicating a potential gear bias against juveniles.

Conclusion

Despite this gear bias, these data shed light on the factors that drive Atlantic Tripletail estuarine distribution and abundance in the northwestern GOM. Wind-driven passive movements in the estuary, combined with active selection of polyhaline habitats near GOM inlets, might be primary drivers of Atlantic Tripletail catch, thus supporting findings from previous studies.

目标大西洋三疣梭子蟹（Lobotes surinamensis）是一种分布于全球的亚热带和热带鱼类，栖息于整个墨西哥湾（GOM）北部的河口，尤其是在温暖的月份。由于该物种很少被休闲渔业捕获，而且在墨西哥湾几乎不存在针对该物种的商业渔业，因此人们对其在河口的分布和栖息模式知之甚少。方法我们利用与渔业无关的长期刺网调查数据来模拟整个得克萨斯州的河口分布情况，并将环境变量与大西洋三疣梭子蟹的捕获量联系起来。结果虽然在时间序列（1990-2022年）中没有观察到渔获量的时间趋势，但最近6年在得克萨斯州10个主要河口中的6个河口的渔获量创下了记录，这可能表明最近出现了丰量脉冲。在整个时间序列中，渔获量在空间上聚集在沿海观察到的少数 "热点 "地区。纬度是渔获量的最佳预测因子，尽管风向和风向（风向与海岸线方向的关系）也是重要的预测因子，而且全球海洋生态系统入海口附近的渔获量最高。得克萨斯州公园与野生动物管理局刺网取样计划捕获的大西洋三疣梭子蟹总长度在 171 毫米到 880 毫米之间，这表明渔具对幼鱼可能存在偏差。结论尽管存在渔具偏差，但这些数据揭示了驱动大西洋三疣梭子蟹在 GOM 西北部河口分布和丰度的因素。风驱动的河口被动运动，加上对 GOM 入海口附近多卤栖息地的主动选择，可能是大西洋三疣梭子鱼捕获量的主要驱动因素，从而支持了之前的研究结果。

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引用次数: 0

Age, growth, and mortality of Blackfin Tuna in the Gulf of Mexico 墨西哥湾黑鳍金枪鱼的年龄、生长和死亡率

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-06-24 DOI: 10.1002/mcf2.10293

E. M. Gutierrez, E. T. Lang, M. S. Lovell, J. Lang, B. J. Falterman, S. R. Midway, M. A. Dance

Objective

An otolith-based aging approach was used to evaluate age and growth relationships, sexual dimorphism in growth, and derive mortality estimates for Blackfin Tuna Thunnus atlanticus in the Gulf of Mexico (GOM).

Methods

Blackfin Tuna (n = 395) were sampled from recreational fisheries and aged from 0 to 13 years, representing an increase over previous estimates of longevity for the species.

Result

Rapid growth was exhibited during the first two years of life, and the Richards growth function provided a better fit (L_∞ = 907 mm, k = 0.112 /year, a = 1.05, b = 0.25) to the data compared with the von Bertalanffy growth model (L_∞ = 824 mm, k = 0.365/year, t₀ = −0.96). Sexual dimorphism in growth was observed, with males (907 mm) reaching a larger L_∞ than females (857 mm), and otolith mass was a strong predictor of age in both sexes. Estimated instantaneous total (Z = 0.532/year) and natural (M = 0.467 year) mortality rates for Blackfin Tuna in the GOM were low relative to previous estimates in the southwestern Atlantic, where fishing mortality (F) is likely much higher.

Conclusion

Results represent critical baseline estimates of size-at-age, longevity, and natural mortality for Blackfin Tuna at relatively low levels of exploitation that can be used to inform future assessments.

目标采用基于耳石的老化方法评估墨西哥湾（GOM）黑鳍金枪鱼（Thunnus atlanticus）的年龄与生长关系、生长中的性二态性，并得出死亡率估计值。方法从休闲渔业中采集黑鳍金枪鱼样本（n = 395），年龄从 0 岁到 13 岁，比以前对该物种寿命的估计有所提高。结果与 von Bertalanffy 生长模型（L∞ = 824 毫米，k = 0.365/年，t0 = -0.96）相比，理查兹生长函数对数据的拟合效果更好（L∞ = 907 毫米，k = 0.112/年，a = 1.05，b = 0.25）。观察到雄鱼（907 毫米）的 L∞ 大于雌鱼（857 毫米），且耳石质量对雌雄鱼的年龄都有很强的预测作用。估计的 GOM 黑鳍金枪鱼瞬时总死亡率（Z = 0.532/年）和自然死亡率（M = 0.467 年）与之前在西南大西洋的估计值相比较低，而西南大西洋的捕捞死亡率（F）可能要高得多。结论这些结果是在相对较低的开发水平下，对黑鳍金枪鱼的年龄大小、寿命和自然死亡率的重要基线估计，可为今后的评估提供参考。

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引用次数: 0

Long-term trends in abundance and recruitment of Shortnose Sturgeon in the Altamaha River, Georgia 佐治亚州阿尔塔玛哈河短吻鲟的丰度和招募的长期趋势

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-06-21 DOI: 10.1002/mcf2.10294

Maxwell Kleinhans, Adam G. Fox

Objective

The objective of this study was to estimate the population size and annual recruitment of Shortnose Sturgeon Accipenser brevirostrum in the Altamaha River estuary in Georgia, United States, during an 11-year period. The Shortnose Sturgeon is an endangered fish species that occupies rivers on the east coast of North America. Previous studies have suggested that the Altamaha River supports the largest population of Shortnose Sturgeon in the southern United States; however, the status of the population has not been assessed in 11 years.

Methods

We used entanglement gears to capture Shortnose Sturgeon in the Altamaha River estuary, marked them, and used an established statistical method (closed-population capture–mark–recapture models) to annually estimate total population size and age-1 recruitment from 2012 to 2022.

Result

We were able to estimate the size of age-1 cohorts in 7 of the 11 years of data collection. Point estimates of annual age-1 recruitment varied between 113 and 1021 individuals, and total population size varied between 452 (95% confidence interval [CI]: 116–2277) and 5054 individuals (95% CI: 2155–13,267).

Conclusion

Recruitment of age-1 juveniles was variable, suggesting that reproduction success is inconsistent between years in the Altamaha River. The results of this study, in combination with previous work, do not show any clear trends in Altamaha River Shortnose Sturgeon population abundance or recruitment. The population seems to be stable, but in the absence of historical population numbers, it is unclear whether the population should be considered recovered or is stagnated in its recovery.

目标本研究旨在估算美国佐治亚州阿尔塔玛哈河河口 11 年间短吻鲟 Accipenser brevirostrum 的种群数量和年繁殖量。短吻鲟是北美东海岸河流中的濒危鱼类。以前的研究表明，阿尔塔玛哈河拥有美国南部最大的短吻鲟种群；但该种群的状况已有 11 年未进行评估。方法我们使用缠网渔具在阿尔塔玛哈河河口捕获短吻鲟，对其进行标记，并使用成熟的统计方法（封闭种群捕获-标记-再捕获模型）对 2012 年至 2022 年期间的总种群数量和 1 龄种群招募情况进行年度估算。结果在收集数据的 11 年中，我们有 7 年能够估算出 1 龄群的规模。每年 1 龄幼体招募量的点估计值介于 113 与 1021 之间，总种群数量介于 452（95% 置信区间 [CI]：116-2277）与 5054（95% 置信区间：2155-13267）之间。结论 1 龄幼鱼的招募情况不一，表明阿尔塔玛哈河不同年份的繁殖成功率不一致。本研究结果与之前的研究结果相结合，并未显示出阿尔塔玛哈河短吻鲟种群丰度或招募的明显趋势。该种群似乎保持稳定，但在缺乏历史种群数量的情况下，尚不清楚该种群是否应被视为已经恢复或恢复停滞。

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引用次数: 0

On the productivity and technical efficiency of the Puerto Rican queen conch Aliger gigas fishery 波多黎各皇后海螺（Aliger gigas）渔业的生产力和技术效率

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-06-21 DOI: 10.1002/mcf2.10296

Juan J. Agar, Daniel Solís

Objective

This study examines the productivity and technical efficiency (TE) of diving operations that target queen conches Aliger gigas in the Commonwealth of Puerto Rico, the largest producer of queen conches in the United States. Currently, there is a proposal to list queen conch as threatened under the Endangered Species Act (ESA).

Methods

We use stochastic production frontier methods to investigate the relationship between catch and fishing inputs and the technical performance of diving operations.

Result

Our results show that the fleet could increase its catches, on average, by 30% (and, thus, increase its income) by using existing fishing inputs and technology more efficiently. We find that the potential to expand catches was slightly higher from increasing the crew size than from extending the length of the fishing trip. The study also finds considerable heterogeneity across coastal regions and operation sizes. Overall, operations on the east and west coasts and those having three or more crew members were more efficient. Operations that use a single gear and specialize on few species (revenue concentration) were associated with higher levels of TE. We also find that diving operations exhibit decreasing returns to scale.

Conclusion

The potential ESA listing of the queen conch poses a dilemma because increasing the efficiency of the fleet may continue to compromise the sustainability of the resource. While a threatened designation does not necessarily result in additional trade or harvest restrictions, further actions may be advisable given the many threats, such as overutilization, habitat loss, coastal pollution, and disruptive environmental change that queen conch populations face. Our model suggests that reducing the size of the crew and/or the length of the trip may increase efficiency, but these restrictions may not be advisable on safety grounds. Thus, management agencies may want to reassess existing trip limits and the length of the closed season and explore the use of closed areas.

目标本研究考察了波多黎各自由邦（美国最大的皇后海螺产地）以皇后海螺（Aliger gigas）为目标的潜水作业的生产力和技术效率（TE）。目前，有人建议将皇后海螺列为《濒危物种法》（ESA）中的濒危物种。方法我们使用随机生产前沿方法研究渔获量和捕捞投入与潜水作业技术性能之间的关系。结果我们的研究结果表明，通过更有效地利用现有的捕捞投入和技术，船队的渔获量平均可增加 30%（从而增加收入）。我们发现，增加船员人数的渔获量增长潜力略高于延长捕鱼时间的增长潜力。研究还发现，不同沿海地区和不同作业规模之间存在很大差异。总体而言，东海岸和西海岸的作业以及拥有三名或三名以上船员的作业效率更高。使用单一渔具和专门捕捞少数物种（收入集中）的作业与较高的 TE 水平有关。我们还发现，潜水作业呈现出规模收益递减的趋势。结论由于提高船队效率可能会继续损害资源的可持续性，因此将皇后海螺列入欧空局（ESA）名单的可能性带来了两难选择。虽然被列入濒危物种名单并不一定会导致额外的贸易或捕捞限制，但考虑到皇后海螺种群面临的诸多威胁，如过度利用、栖息地丧失、沿海污染和破坏性环境变化，采取进一步行动可能是明智之举。我们的模型表明，减少船员人数和/或缩短航行时间可能会提高效率，但出于安全考虑，这些限制措施可能并不可取。因此，管理机构可能需要重新评估现有的出海限制和禁渔期长度，并探索禁渔区的使用。

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引用次数: 0

Trends in predicted age at maturity of Sablefish from 22 years of surveys 22 年调查中貂鱼成熟年龄的预测趋势

IF 1.7 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-06-11 DOI: 10.1002/mcf2.10295

C. J. Rodgveller, K. B. Echave

Objective

Our aim was to predict the maturity (will spawn or immature) of Sablefish Anoplopoma fimbria in Alaska for past years during a period when macroscopic data are not of utility and histological observations are not available.

Methods

In a previous study, female maturity was determined using histology and a model was developed that predicted maturity using maternal length, age, and relative condition. We used this published model to predict the maturity of individual Sablefish collected annually in the same area on the same dates. The maturity predictions were used to create predicted time series of maturity at age for surveys conducted over 22 years.

Result

A k-means cluster analysis of annual maturity parameters revealed that data should be split into two clusters. These groups were chronologically sequential (1998–2010 and 2011–2019), with two exceptions: 2015 and 2017 were assigned to the early time period. We created two chronological time blocks by incorporating the two outlier years into the late period post hoc, as we are not aware of mechanisms that may have caused these two outliers, and it is important for stock assessment to capture the signal and not the noise. Sablefish in the later period were predicted to mature later than fish in the earlier period; age at 50% maturity was 5.5 years in the early period and 6.8 years in the later period, and the slope was shallower in the later period.

Conclusion

There are often gaps in reliable maturity data. This case study illustrates that limited histological data sets can be used to predict maturity in years without ovary samples and illustrates how these data can be grouped based on similarities and chronology for use in stock assessment. We recommend more histological studies in the future to test assumptions of the predictive model, and we recommend evaluations of other factors, such as environmental time series, that may be drivers of annual maturity.

目的我们的目的是预测阿拉斯加黑貂鱼 Anoplopoma fimbria 过去几年的成熟度（将产卵或未成熟），因为在此期间，宏观数据不实用，也无法获得组织学观察结果。方法在之前的一项研究中，雌鱼的成熟度是通过组织学来确定的，并建立了一个模型，通过母鱼的体长、年龄和相对状况来预测成熟度。我们使用这个已发布的模型来预测每年在同一地区、同一日期采集的貂鱼个体的成熟度。成熟度预测用于创建 22 年调查的成熟年龄预测时间序列。结果对年度成熟度参数进行 k-means 聚类分析后发现，数据应分为两组。这些群组按时间顺序排列（1998-2010 年和 2011-2019 年），但有两个例外：2015 年和 2017 年被归入早期时间段。我们将这两个异常年份纳入晚期时间段，创建了两个按时间顺序排列的时间段，因为我们不知道可能造成这两个异常值的机制，而且对于种群评估来说，重要的是捕捉信号而不是噪音。据预测，后期的黑貂鱼比前期的鱼成熟得晚；前期的 50%成熟年龄为 5.5 岁，后期为 6.8 岁，后期的斜率较浅。结论可靠的成熟度数据往往是空白。本案例研究说明，在没有卵巢样本的年份，可以利用有限的组织学数据集预测成熟度，并说明如何根据相似性和年代学对这些数据进行分组，以用于种群评估。我们建议今后开展更多的组织学研究，以检验预测模型的假设，并建议对可能影响年成熟度的其他因素（如环境时间序列）进行评估。

{"title":"Trends in predicted age at maturity of Sablefish from 22 years of surveys","authors":"C. J. Rodgveller, K. B. Echave","doi":"10.1002/mcf2.10295","DOIUrl":"https://doi.org/10.1002/mcf2.10295","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Our aim was to predict the maturity (will spawn or immature) of Sablefish <i>Anoplopoma fimbria</i> in Alaska for past years during a period when macroscopic data are not of utility and histological observations are not available.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>In a previous study, female maturity was determined using histology and a model was developed that predicted maturity using maternal length, age, and relative condition. We used this published model to predict the maturity of individual Sablefish collected annually in the same area on the same dates. The maturity predictions were used to create predicted time series of maturity at age for surveys conducted over 22 years.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>A <i>k</i>-means cluster analysis of annual maturity parameters revealed that data should be split into two clusters. These groups were chronologically sequential (1998–2010 and 2011–2019), with two exceptions: 2015 and 2017 were assigned to the early time period. We created two chronological time blocks by incorporating the two outlier years into the late period post hoc, as we are not aware of mechanisms that may have caused these two outliers, and it is important for stock assessment to capture the signal and not the noise. Sablefish in the later period were predicted to mature later than fish in the earlier period; age at 50% maturity was 5.5 years in the early period and 6.8 years in the later period, and the slope was shallower in the later period.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>There are often gaps in reliable maturity data. This case study illustrates that limited histological data sets can be used to predict maturity in years without ovary samples and illustrates how these data can be grouped based on similarities and chronology for use in stock assessment. We recommend more histological studies in the future to test assumptions of the predictive model, and we recommend evaluations of other factors, such as environmental time series, that may be drivers of annual maturity.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10295","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141308834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Size at maturity, reproductive cycle, and fecundity of the southern California brown box crab Lopholithodes foraminatus and implications for developing a new targeted fishery 南加州褐箱蟹 Lopholithodes foraminatus 的成熟尺寸、繁殖周期和繁殖力以及对发展新的定向渔业的影响

IF 1.7 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-06-10 DOI: 10.1002/mcf2.10291

Ashley Stroud, Carolynn S. Culver, Henry M. Page

Objective

The brown box crab Lopholithodes foraminatus is a member of the king and stone crab family (Lithodidae) that occurs in deepwater along the eastern Pacific coast. Historically, landings in California have been low for this species, but an increase in fishing pressure prompted the state to designate it as an emerging fishery and implement an experimental fishery program. With no known biological studies of California brown box crab, essential fisheries information is needed to evaluate the feasibility of a new targeted fishery.

Methods

Using field sampling and observations, along with laboratory studies, we investigated elements of reproductive capacity of the brown box crab in southern California.

Result

We found that females reach physiological maturity at a carapace width (CW) between 50.8 and 71.7 mm, and males do so at a CW between 43.3 and 66.3 mm. Morphometric maturity analysis showed a clear inflection point of abdomen width between immature and mature females. Females were 50% functionally mature at 75 mm CW. Morphometric and functional maturity was not detected for males, albeit samples of small male crabs were extremely limited, thus warranting further study. Females followed a biennial reproduction pattern: mating occurred in the fall, followed by an approximately 18-month brooding period, with hatching in the second spring after mating. Fecundity was positively related to size and ranged from 8352 eggs/brood for a 67.8-mm-CW female to 62,181 eggs/brood for a 130.5-mm-CW female.

Conclusion

These findings can inform the evaluation of a fishery for the brown box crab, including potential management strategies and models for assessing stock condition.

目标棕色箱蟹（Lopholithodes foraminatus）是帝王蟹和石蟹科（Lithodidae）的成员，分布在东太平洋沿岸的深水区。该物种在加利福尼亚州的上岸量一直较低，但捕捞压力的增加促使该州将其指定为新兴渔业，并实施了一项试验性渔业计划。由于没有对加州褐箱蟹进行已知的生物学研究，因此需要必要的渔业信息来评估新的定向渔业的可行性。方法通过实地取样和观察以及实验室研究，我们调查了加利福尼亚南部棕箱蟹的繁殖能力要素。结果我们发现，雌性达到生理成熟的胴体宽度（CW）在 50.8 至 71.7 毫米之间，雄性达到生理成熟的胴体宽度（CW）在 43.3 至 66.3 毫米之间。形态成熟度分析表明，未成熟雌性和成熟雌性之间的腹部宽度有一个明显的拐点。雌性的功能成熟度在 75 mm CW 时达到 50%。雄蟹的形态和功能成熟度均未检测到，尽管小型雄蟹的样本极为有限，因此值得进一步研究。雌蟹遵循两年一次的繁殖模式：秋季交配，随后是大约 18 个月的育雏期，交配后的第二个春季孵化。繁殖力与体型呈正相关，从 67.8 mm-CW 雌性的 8352 枚卵/巢到 130.5 mm-CW 雌性的 62181 枚卵/巢不等。结论这些发现可为评估褐箱蟹渔业提供信息，包括潜在的管理策略和种群状况评估模型。

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引用次数: 0

Vertebral chemistry distinguishes regional populations of Blacktip Sharks in the northern Gulf of Mexico 脊椎化学区分墨西哥湾北部的黑鳍鲨区域种群

IF 1.7 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries

Pub Date : 2024-05-15 DOI: 10.1002/mcf2.10290

Abigail H. P. Hayne, Travis M. Richards, J. Marcus Drymon, Brett Falterman, Nathan R. Miller, R. J. David Wells, John A. Mohan

Objective

Understanding the spatial connectivity of elasmobranch populations is critical for regional fisheries management. The Blacktip Shark Carcharhinus limbatus is abundant in coastal waters of the Gulf of Mexico (GoM) and important in recreational and commercial fisheries. Based on genetic and tagging studies, GoM Blacktip Sharks are currently managed under separate quotas between the eastern and western GoM (divided at 88°W), but no studies have used vertebral chemistry to assess the population structure of adult Blacktip Sharks.

Methods

We compared vertebral elemental signatures (barium [Ba], magnesium [Mg], manganese [Mn], strontium [Sr], and zinc [Zn]) for the first year of life with last occupied habitats (vertebral edges) in Blacktip Sharks collected from the western (Texas and Louisiana) and eastern (Alabama and Florida) coastal waters of the northern GoM.

Result

We found significant regional differences in Ba, Mg, Mn, and Sr vertebral edge signatures, suggesting ecological separation of Blacktip Sharks. Significant correlation between first-year and edge signatures suggested a high degree of residency between life stages. Cross-validated discriminant function analyses yielded highest regional classification accuracies when Florida sharks were grouped separately west of 88°W (90%), demonstrating the unique elemental signatures of eastern versus western GoM Blacktip Sharks under current management delineations.

Conclusion

Combined, these findings demonstrate that trace element markers can distinguish regional populations of Blacktip Sharks and provide a complimentary approach in addition to genetics and physical tagging to support current stock management efforts.

目标了解箭亚纲动物种群的空间连通性对于区域渔业管理至关重要。黑鳍鲨 (Carcharhinus limbatus) 在墨西哥湾沿海水域数量众多，在休闲渔业和商业渔业中占有重要地位。根据基因和标签研究，墨西哥湾黑鳍鲨目前在墨西哥湾东部和西部（以西经 88 度划分）按照不同的配额进行管理，但还没有研究利用脊椎化学来评估成年黑鳍鲨的种群结构。方法我们比较了从地中海北部西部（得克萨斯州和路易斯安那州）和东部（阿拉巴马州和佛罗里达州）沿岸水域采集的黑鳍鲨生命第一年的脊椎元素特征（钡[Ba]、镁[Mg]、锰[Mn]、锶[Sr]和锌[Zn]）和最后占据的栖息地（脊椎边缘）。结果我们发现钡、镁、锰和锶的椎骨边缘特征存在明显的区域差异，这表明黑鳍鲨的生态环境是分离的。第一年和边缘特征之间的显著相关性表明，不同生命阶段的黑鳍鲨具有高度的居住性。交叉验证的判别函数分析结果表明，将西经 88 度以西的佛罗里达鲨鱼单独分组时，区域分类准确率最高（90%），这表明在当前的管理划界下，东部与西部黑鳍鲨具有独特的元素特征。结论综上所述，这些研究结果表明，微量元素标记可以区分黑鳍鲨的区域种群，并在遗传学和物理标记之外提供了一种辅助方法，以支持当前的种群管理工作。

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引用次数: 0