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Spatial distributions of Jonah and Atlantic rock crabs in the Georges Bank and Mid-Atlantic Bight regions during 1968–2021 1968-2021 年期间乔治斯滩和大西洋中部海湾区域约拿蟹和大西洋岩蟹的空间分布情况
IF 1.8 3区 农林科学 Q2 FISHERIES Pub Date : 2024-10-28 DOI: 10.1002/mcf2.10315
Kaitlynn J. Wade, Michael J. Wilberg, Burton Shank, Daniel W. Cullen

Objective

The commercial importance of Jonah crabs Cancer borealis and Atlantic rock crabs Cancer irroratus has increased over the past few decades, but both species are still data limited. Objectives were to determine the spatial distributions of Jonah and Atlantic rock crabs over time and to estimate associations with environmental variables.

Methods

Data were from the Northeast Fisheries Science Center offshore spring bottom trawl surveys during 1968–2021 on Georges Bank and in the Mid-Atlantic Bight. Environmental preferences for temperature (°C), depth (m), and grain size (ϕ) were estimated using generalized additive models, and the habitat usage between the two crabs were compared using empirical cumulative distribution functions.

Result

The spatial distributions of Jonah and Atlantic rock crabs changed over time. Grain size was the most important environmental variable for predicting presence of Jonah crabs, and depth was the most important variable for explaining presence of Atlantic rock crabs. The generalized additive model with the best cross validation and the lowest Akaike information criterion for both crabs included all environmental, spatial, and temporal variables.

Conclusion

Jonah and Atlantic rock crabs have different spatial distributions and environmental preferences. Jonah crabs preferred slightly warmer temperatures, deeper depths, and muddier sediments than Atlantic rock crabs. As the commercial importance for Jonah crabs increases, information on their population distribution and habitat usage is important for effective management.

目标 在过去几十年中,约拿蟹和大西洋岩蟹的商业重要性有所增加,但这两个物种的数据仍然有限。目标确定约拿蟹和大西洋岩蟹随时间变化的空间分布,并估计与环境变量的关系。 方法 数据来自东北渔业科学中心 1968-2021 年期间在乔治滩和大西洋中部海湾进行的近海春季底拖网调查。利用广义加法模型估计了两种蟹对温度(°C)、深度(m)和粒径(j)的环境偏好,并利用经验累积分布函数比较了两种蟹对生境的利用情况。 结果 约拿蟹和大西洋石蟹的空间分布随着时间的推移而变化。粒径是预测约拿蟹出现的最重要环境变量,而深度则是解释大西洋岩蟹出现的最重要变量。对这两种蟹而言,交叉验证效果最好、阿凯克信息准则最低的广义加法模型包括所有环境、空间和时间变量。 结论 约拿蟹和大西洋岩蟹具有不同的空间分布和环境偏好。与大西洋岩蟹相比,约拿蟹更喜欢温度稍高、水深较深和泥泞的沉积物。随着约拿蟹商业重要性的增加,有关其种群分布和栖息地使用情况的信息对有效管理非常重要。
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引用次数: 0
Shifting spawning phenology in Hudson River American Shad 哈德逊河美洲鲥鱼产卵物候的变化
IF 1.8 3区 农林科学 Q2 FISHERIES Pub Date : 2024-10-22 DOI: 10.1002/mcf2.10312
Hsiao-Yun Chang, Yong Chen

Objective

The objectives of this study were to investigate potential shift in the phenology of spawning for the Hudson River American Shad Alosa sapidissima and to identify factors contributing to the decline of the Hudson River shad population.

Methods

This study utilized American Shad eggs collected from the Long River Ichthyoplankton Survey. Logistic models were employed to estimate spawning phenology metrics, including the onset, peak, cessation, and duration of the spawning season. Additionally, we investigated the effects of biotic and abiotic variables on spawning timing.

Result

This study suggests that temporal changes in the spawning onset exhibited high variation and were not significant. However, a significantly delayed spawning peak and cessation, along with an extended spawning season, were observed. Additionally, the findings of this study revealed a correlation between the timing of spawning onset and water temperature, indicating that a 1°C increase in water temperature was associated with a 3.66-day earlier initiation of spawning. Smaller female spawner size was associated with delayed peak and cessation of the spawning season. With a 1-cm decrease in the average female spawner size, the peak of the spawning season was delayed by 1.79 days and the cessation of the spawning season was delayed by 2.87 days.

Conclusion

The findings indicate that water temperature may be a crucial trigger for initiating spawning in Hudson River American Shad, with higher water temperatures associated with earlier spawning onset. Moreover, the findings indicate that the timing of spawning peaks and cessations has been progressively delayed over time, and this is linked to the size of female spawners.

目标 本研究旨在调查哈德逊河美洲鲥鱼产卵物候的潜在变化,并确定导致哈德逊河鲥鱼数量下降的因素。 方法 该研究利用了从长河鱼类调查中收集的美洲鲥鱼卵。我们采用逻辑模型来估算产卵表征指标,包括产卵季节的开始、高峰、停止和持续时间。此外,我们还研究了生物和非生物变量对产卵时间的影响。 结果 这项研究表明,产卵期开始的时间变化差异很大,且不显著。然而,产卵高峰和停止时间明显推迟,产卵期延长。此外,该研究结果表明,产卵开始时间与水温之间存在相关性,水温每升高 1°C,产卵开始时间就会提前 3.66 天。雌性产卵器较小与产卵高峰期和产卵停止期推迟有关。雌性产卵器平均尺寸每减小 1 厘米,产卵季节的高峰期就会推迟 1.79 天,产卵季节的结束期也会推迟 2.87 天。 结论 研究结果表明,水温可能是哈德逊河美洲鲥鱼开始产卵的关键触发因素,水温越高,产卵开始的时间越早。此外,研究结果表明,随着时间的推移,产卵高峰和产卵停止的时间逐渐推迟,这与雌性产卵者的大小有关。
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引用次数: 0
Evaluating the conservation benefit of circle hooks for the Atlantic Striped Bass recreational fishery 评估圈钩对大西洋带鱼休闲渔业的保护效益
IF 1.8 3区 农林科学 Q2 FISHERIES Pub Date : 2024-09-21 DOI: 10.1002/mcf2.10308
Micah J. Dean, William S. Hoffman, Benjamin I. Gahagan, Gary A. Nelson, Michael P. Armstrong

Objective

The Striped Bass Morone saxatilis is one of the most sought-after recreational fish species along the US Atlantic coast. Regulations and a strong conservation ethic among anglers make Striped Bass among the most frequently released coastal marine fishes. A recent rule requires anglers to use circle hooks when targeting Striped Bass with natural baits, yet the conservation benefit of this action remains unclear.

Methods

We used acoustic telemetry to monitor the fate of Striped Bass that were recreationally caught with baited hooks (n = 349) and to estimate the influence of various biological (fish size), fishery (fight time, handling time, hook location, bait type, and hook type), and environmental (water temperature and air temperature) variables on postrelease survival.

Result

A semi-quantitative score of fish release condition was the single best predictor of mortality. A broader dataset that included untagged fish (n = 716) was used to identify the best predictors of fish release condition, which included hook location and handling time.

Conclusion

Contrary to expectations, the circle hooks used in this study did not result in lower release mortality than conventional J-hooks.

目标 花脸鲈(Morone saxatilis)是美国大西洋沿岸最受欢迎的休闲鱼类之一。相关法规和垂钓者强烈的保护意识使花脸鲈成为最常被释放的沿海海洋鱼类之一。最近的一项规定要求垂钓者在用天然饵料垂钓带鱼时使用圆钩,但这一行动对保护带鱼的益处仍不清楚。 方法 我们使用声学遥测技术监测用带饵鱼钩娱乐性捕获的带鱼(n = 349)的命运,并估计各种生物(鱼体大小)、渔业(搏斗时间、处理时间、鱼钩位置、鱼饵类型和鱼钩类型)和环境(水温和气温)变量对释放后存活率的影响。 结果 鱼类释放条件的半定量评分是预测死亡率的唯一最佳指标。使用包括未标记鱼类(n = 716)的更广泛数据集来确定鱼类释放条件的最佳预测指标,其中包括鱼钩位置和处理时间。 结论 与预期相反,本研究中使用的圆钩并没有导致比传统 J 形钩更低的释放死亡率。
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引用次数: 0
Analysis of fishing intensity in the South China Sea based on automatic identification system data: A comparison between China and Vietnam 基于自动识别系统数据的南海捕捞强度分析:中国与越南的比较
IF 1.8 3区 农林科学 Q2 FISHERIES Pub Date : 2024-09-08 DOI: 10.1002/mcf2.10309
Wenzhou Wu, Peng Zhang, Qi Wang, Lu Kang, Fenzhen Su

Objective

Recently, the South China Sea has been facing a crisis of depleted fishery resources, primarily due to the impacts of illegal, unreported, and unregulated fishing activities, as well as overfishing. Accurately understanding the fishing activity intensity in the South China Sea holds significant implications for the sustainable management of fisheries resources.

Methods

Leveraging the automatic identification system trajectory data from 2018, this paper employs spatial statistical methods and fishing effort indicators to comparatively analyze the spatial variations in fishing intensity between Chinese and Vietnamese fishing vessels.

Result

The results of this study show that (1) in 2018, the total fishing effort of Chinese fishing vessels in the South China Sea was 7.65 times that of Vietnamese vessels, but during China's South China Sea fishing moratorium, the fishing effort exerted by Vietnamese vessels surpassed that of China and (2) the top 10 ports in China and Vietnam support approximately 30% and 55.13% of their respective fishing intensities in the South China Sea.

Conclusion

The study highlights significant variations in fishing intensity between Chinese and Vietnamese vessels and the substantial support provided by major ports. These findings offer valuable insights for fisheries resource monitoring and maritime spatial planning, contributing to the sustainable management of the South China Sea's fisheries resources.

目标 最近,主要由于非法、未报告和无管制的捕捞活动以及过度捕捞的影响,南海一直面临着渔业资源枯竭的危机。准确了解南海的捕捞活动强度对渔业资源的可持续管理具有重要意义。 方法 本文利用2018年自动识别系统轨迹数据,采用空间统计方法和捕捞强度指标,比较分析了中越渔船捕捞强度的空间变化。 结果 研究结果表明:(1)2018 年,中国渔船在南海的总捕捞强度是越南渔船的 7.65 倍,但在中国南海伏季休渔期间,越南渔船的捕捞强度超过了中国;(2)中国和越南的前十大港口支撑了各自约 30%和 55.13%的南海捕捞强度。 结论 本研究强调了中国和越南船只在捕捞强度上的显著差异,以及主要港口提供的大量支持。这些发现为渔业资源监测和海洋空间规划提供了宝贵的见解,有助于南海渔业资源的可持续管理。
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引用次数: 0
Bycatch mitigation for commonly caught shark species in the Gulf of Mexico reef bottom longline fishery 墨西哥湾珊瑚礁底层延绳钓渔业中常见鲨鱼物种的混获缓解措施
IF 1.8 3区 农林科学 Q2 FISHERIES Pub Date : 2024-09-05 DOI: 10.1002/mcf2.10310
Halie B. O'Farrell, Elizabeth A. Babcock, Kevin J. McCarthy

Objective

The Gulf of Mexico (GOM) reef bottom longline fishery typically not only targets groupers and snappers but also interacts with 27 species of sharks, which are primarily discarded as bycatch. Slow growth, late maturity, and low fecundity in a landscape of increasing fishing pressure make sharks comparatively more susceptible to overfishing and endangered status than other fishes. The purpose of this study was to determine which gear and/or environmental variables best predict the shark catch per set for commonly caught shark species in the GOM reef bottom longline fishery.

Methods

We considered 12 commonly caught shark species that vary from the abundant Atlantic Sharpnose Shark Rhizoprionodon terraenovae to the critically endangered Scalloped Hammerhead Sphyrna lewini. Catch per set, effort, gear, and environmental data were taken from the National Oceanic and Atmospheric Administration National Marine Fisheries Service observer dataset for the GOM reef bottom longline fishery (2009–2017) and were used to fit generalized additive models. The Bayesian information criterion and 10-fold cross-validation were used to select the best set of variables that predicted catch per set to determine gear configurations, fisher activities, and environmental conditions contributing to higher shark catch per unit effort. We modeled each species individually, all species combined, and species grouped by similar ecology.

Result

Gear and fishing method variables were consistently included in the best predictive models across species and were the only potential basis for a single strategy that could decrease bycatch across all 12 species. Patterns of environmental variables were only consistent across species with similar ecology and habitat.

Conclusion

Sharks as a group should not be lumped together, as the effects of mitigation measures become confounded and directly managing trade-offs between species when minimizing bycatch becomes impossible. Focusing on gear rather than environmental variables is the best apparent option to potentially reduce shark catch per set across commonly caught species while minimizing trade-offs.

目标 墨西哥湾(GOM)珊瑚礁底层延绳钓渔业通常不仅以石斑鱼和笛鲷为目标,而且还与 27 种鲨鱼互动,这些鲨鱼主要作为副渔获物被丢弃。在捕捞压力不断增加的情况下,鲨鱼生长缓慢、成熟晚、繁殖力低,因此与其他鱼类相比,鲨鱼更容易被过度捕捞而濒临灭绝。本研究的目的是确定哪些渔具和/或环境变量最能预测在 GOM 礁底延绳钓渔业中常见鲨鱼物种的每套渔获量。 方法 我们考虑了 12 种常捕获的鲨鱼物种,从丰富的大西洋尖吻鲨 Rhizoprionodon terraenovae 到极度濒危的扇形锤头鲨 Sphyrna lewini。每套渔获量、努力量、渔具和环境数据来自美国国家海洋和大气管理局国家海洋渔业服务局对 GOM 礁底延绳钓渔业的观测数据集(2009-2017 年),并用于拟合广义加性模型。贝叶斯信息准则和 10 倍交叉验证用于选择预测每套渔获量的最佳变量集,以确定导致鲨鱼单位努力量渔获量增加的渔具配置、渔民活动和环境条件。我们对每个鱼种单独建模,对所有鱼种合并建模,以及对按相似生态学分组的鱼种建模。 结果 渔具和捕捞方法变量始终包含在各物种的最佳预测模型中,并且是可减少所有 12 个物种副渔获物的单一策略的唯一潜在基础。环境变量的模式仅在生态和栖息地相似的物种之间保持一致。 结论 不应将鲨鱼作为一个群体混为一谈,因为减缓措施的效果会混淆,在最大限度减少混获 物时不可能直接管理物种之间的权衡。将重点放在渔具而不是环境变量上是最好的选择,这样有可能在最大程度减少权衡的同时减少常见捕捞物种的鲨鱼单次渔获量。
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引用次数: 0
Reproductive cycle of the temperate sea cucumber Holothuria tubulosa in the northeastern Aegean Sea 爱琴海东北部温带海参Holothuria tubulosa的繁殖周期
IF 1.8 3区 农林科学 Q2 FISHERIES Pub Date : 2024-08-18 DOI: 10.1002/mcf2.10307
Serhat Engin, Mustafa Tolga Tolon, Deniz Günay, Dilek Emiroğlu

Objective

The aim of this study was to determine the reproductive cycle and spawning frequency of the sea cucumber Holothuria tubulosa in the northeastern Aegean Sea.

Methods

The study covered a period of 12 months, beginning in October 2018 and concluding in September 2019. During this period, sea cucumber samples were collected monthly. Macroscopic and histological examinations of gonadal tubules were conducted to provide credible information for fishery management and aquaculture.

Result

The sex ratio of the sampled population was 1:1.3, with 95 males and 130 females. The drained body weights at 50% maturity were 70.90 g for females and 70.80 g for males. The total length at 50% maturity was estimated at 18.58 cm for females and 18.05 cm for males. Gonad maturation was initiated in March and progressed to spawning stages between July and August. From September to February, the gonads were in postspawning and recovery stages. A strong linear correlation was determined between the gonad index and the seawater temperature in the area.

Conclusion

The information provided is expected to improve stock management, enforce fishery regulations, and support controlled breeding programs. These measures aim to preserve the natural populations of Holothuria tubulosa and guarantee the long-term viability of the species in the wild.

目标 本研究旨在确定爱琴海东北部海参Holothuria tubulosa的繁殖周期和产卵频率。 研究方法 这项研究从 2018 年 10 月开始,到 2019 年 9 月结束,为期 12 个月。在此期间,每月收集海参样本。对性腺小管进行了宏观和组织学检查,以便为渔业管理和水产养殖提供可靠信息。 结果 采样种群的性别比例为 1:1.3,其中雄性 95 只,雌性 130 只。雌鱼和雄鱼在 50%成熟时的体重分别为 70.90 克和 70.80 克。据估计,50%成熟时的总长度雌性为 18.58 厘米,雄性为 18.05 厘米。性腺成熟期从 3 月开始,7 月至 8 月间进入产卵期。从 9 月到次年 2 月,性腺处于产卵后和恢复阶段。性腺指数与该地区的海水温度之间存在很强的线性相关。 结论 所提供的信息有望改善种群管理、执行渔业法规和支持受控繁殖计划。这些措施旨在保护管圆吻鲈的自然种群,保证该物种在野外的长期生存能力。
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引用次数: 0
Evaluating Pacific salmon swimming behavior in the aft end of a pelagic trawl to inform bycatch reduction device design and use 评估太平洋鲑鱼在中上层拖网尾部的游泳行为,为减少兼捕渔获物装置的设计和使用提供信息
IF 1.8 3区 农林科学 Q2 FISHERIES Pub Date : 2024-08-18 DOI: 10.1002/mcf2.10306
David R. Bryan, Noëlle Yochum, Katherine C. Wilson

Objective

Although the bycatch of Pacific salmon Oncorhynchus spp. is relatively low in the Walleye Pollock Gadus chalcogrammus and Pacific Hake Merluccius productus pelagic trawl fisheries, different efforts are employed to reduce it, including the use of bycatch reduction devices (BRDs) that retain the targeted species and provide Pacific salmon a pathway to escape. The objective of this study was to evaluate Pacific salmon behavior inside a pelagic trawl and to determine what conditions favor the probability of a salmon moving forward in the trawl and increase their probability of escapement.

Methods

We placed a video camera at the entrance of the cod end and recorded the behaviors of Pacific salmon as they passed by. The timing of the forward movement Pacific salmon in relation to fishing operations and the correlations between forward movement of Pacific salmon and vessel speed over ground, water flow rate, ambient light levels, and abundance of Walleye Pollock were examined.

Result

Of the 2969 Pacific salmon observed, 71% were moving aft toward the cod end, 24% were observed moving forward, and 5% were moving aft then forward or forward then aft. The percentage (77%) and rate (0.86 fish per minute) of forward-moving Pacific salmon was greatest once the trawl doors were back on the vessel and water flow within the trawl was reduced. Speed over ground and Walleye Pollock abundance were negatively correlated with forward movement of Pacific salmon. Only 6.5% of Pacific salmon that were in the cod end when fishing ended were able to move forward before the cod end was on the vessel.

Conclusion

Pacific salmon can move forward in the trawl throughout fishing operations and haulback, but the percentage increases as the speed over ground and water flow inside the trawl is reduced. The low percentage of Pacific salmon that move forward after fishing has ended suggests that Pacific salmon escapement at the end of a tow is relatively low and suggests that BRD design should focus on stimulating escapement at the first BRD encounter.

尽管太平洋鲑鱼(Oncorhynchus spp.)在马眼鳕(Gadus chalcogrammus)和太平洋无须鳕(Merluccius productus)中上层拖网渔业中的混获量相对较低,但仍采取了不同措施来减少混获量, 包括使用混获减少装置(BRDs),保留目标物种并为太平洋鲑鱼提供逃逸途径。本研究的目的是评估太平洋大马哈鱼在中上层拖网内的行为,并确定哪些条件有利于大马哈鱼在拖网中前进并增加其逃逸的概率。 方法 我们在鳕鱼端入口处放置了一台摄像机,记录太平洋鲑鱼经过时的行为。我们研究了太平洋鲑鱼向前移动的时间与捕鱼作业的关系,以及太平洋鲑鱼向前移动与船只在地面上的速度、水流速度、环境光照度和瓦利耶-波洛克丰度之间的相关性。 结果 在观察到的 2969 条太平洋大马哈鱼中,71% 向鳕鱼尾部移动,24% 被观察到向前移动,5% 先向后向前移动或先向前后向后移动。一旦拖网门回到船上,拖网内的水流减少,太平洋鲑鱼向前移动的比例(77%)和速度(每分钟 0.86 条)最大。太平洋大马哈鱼的前进速度和马眼鳕丰度与地面速度和马眼鳕丰度呈负相关。捕捞结束时,仅有 6.5% 的太平洋鲑鱼在鳕鱼端上船之前能够向前移动。 结论 太平洋大马哈鱼在整个捕捞作业和回拖过程中都能在拖网中向前移动,但随着拖网内地面和水流速度的降低,其比例会增加。捕捞结束后,太平洋大马哈鱼向前移动的比例较低,这表明拖网结束时太平洋大马哈鱼的逃逸量相对较低,并表明 BRD 设计应侧重于刺激首次遇到 BRD 时的逃逸量。
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引用次数: 0
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 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 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 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
期刊
Marine and Coastal Fisheries
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