Fisheries Research最新文献_第7页

Changes in growth of the Naru eagle ray Aetobatus narutobiei in Ariake Bay, based on over two decades of monitoring under fishing pressure 在捕捞压力下，根据20多年的监测，有明湾Naru鹰鳐的生长变化

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-06 DOI: 10.1016/j.fishres.2025.107588

YanJun Wang , Yoshimi Ogino , Keisuke Furumitsu , Atsuko Yamaguchi

Intensive fishing has altered the growth of both target and non-target teleost fish. However, the effects of intensive fishing on elasmobranchs remain poorly understood. The Naru eagle ray Aetobatus narutobiei is a species endemic to East Asia that primarily inhabits Ariake Bay, Japan. Since 2001, a predator control program has been implemented to protect economically valuable bivalves, which has led to a significant decline in the population of this species. Understanding its age and growth parameters is crucial for accurate assessment and sustainable management. This study analyzed 864 vertebral samples (389 males and 475 females) collected during three phases—the Initial Phase (2001–2005), Development Phase I (2013–2018), and Development Phase II (2019–2024)—to estimate age and growth using four candidate models. Model selection based on AIC_c indicated that the von Bertalanffy growth function provided the most precise description of the species’ growth in terms of fitting to the observed age-disc width data. The maximum observed age during the sampling period was 18 years for males and 30 years for females. The likelihood ratio test indicated significant differences in the growth curves between the Initial Phase and Development Phases in both sexes. The asymptotic disc width (DW_∞) decreased over time, while the growth coefficient (k) increased, indicating growth acceleration. Although the primary factors driving growth changes remain unclear, reduced intraspecific competition due to population decline may be a more direct and critical factor than elevated seawater temperature. This study enhances our understanding of the biology of A. narutobiei and provides a critical foundation for future stock assessments.

密集捕捞改变了靶鱼和非靶硬骨鱼的生长。然而，人们对密集捕捞对蓝鳃亚种的影响仍然知之甚少。Naru鹰射线Aetobatus narutobiei是一种东亚特有的物种，主要居住在日本有明湾。自2001年以来，为了保护具有经济价值的双壳类动物，实施了一项捕食者控制计划，这导致了该物种数量的显著下降。了解其年龄和生长参数对于准确评估和可持续管理至关重要。本研究分析了在初始阶段（2001-2005年）、发展阶段I（2013-2018年）和发展阶段II（2019-2024年）三个阶段收集的864个椎体样本（389个男性和475个女性），使用四种候选模型估计年龄和生长。基于AICc的模型选择表明，von Bertalanffy生长函数在拟合观测到的年龄盘宽度数据方面提供了最精确的物种生长描述。抽样期间观察到的最大年龄为男性18岁，女性30岁。经似然比检验，两性在初发期和发育期的生长曲线有显著差异。随着时间的推移，渐近圆盘宽度（DW∞）减小，而增长系数(k)增大，表明增长加速。虽然驱动生长变化的主要因素尚不清楚，但种群减少导致的种内竞争减少可能是比海水温度升高更直接和关键的因素。本研究提高了我们对纳鲁托贝生物学的认识，为今后的种群评估提供了重要的基础。

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引用次数: 0

Valuing sustainability: Price premiums for dolphin-safe and MSC-certified canned tuna 重视可持续性：对海豚无害和msc认证的罐装金枪鱼的价格溢价

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-06 DOI: 10.1016/j.fishres.2025.107591

Yingkai Fang , Lingxiao Wang , Julia Bronnmann

The evolution of ecolabels has led to many food products carrying multiple certifications for their environmental and ecological commitments. In the tuna market, the “dolphin-safe” label and the Marine Stewardship Council (MSC) certification are the most prominent. This paper uses a novel dataset that links Nielsen Retail Scanner data from 2017 to 2019 with ecolabel information to estimate the impact of different certifications on canned tuna prices. Applying a hedonic pricing model, we find significant price premiums for single labels, 25.4 % for dolphin-safe tuna, and 44.6 % for MSC-certified products. Our results also show that dual labeling yields a price premium of 81.3 %, substantially higher than the sum of the two individual effects. Moreover, the results underscore the potential of ecolabels to incentivize sustainable practices, with dual certification enhancing credibility and consumer trust amid increasingly complex certification systems.

生态标签的演变导致许多食品为其环境和生态承诺提供了多种认证。在金枪鱼市场上，“海豚安全”标签和海洋管理委员会（MSC）认证是最突出的。本文使用了一个新颖的数据集，将2017年至2019年的尼尔森零售扫描仪数据与生态标签信息联系起来，以估计不同认证对罐装金枪鱼价格的影响。应用享乐定价模型，我们发现单个标签的价格溢价显著，海豚安全金枪鱼的价格溢价为25.4% %，msc认证产品的价格溢价为44.6% %。我们的结果还表明，双重标签产生的价格溢价为81.3 %，大大高于两个个体效应的总和。此外，研究结果强调了生态标签在激励可持续实践方面的潜力，在日益复杂的认证体系中，双重认证增强了信誉和消费者信任。

引用次数: 0

Temporal stability of otolith shape in fishes and its relationship with diet: A case study of parrotfish in Xisha Islands, China

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-04 DOI: 10.1016/j.fishres.2025.107592

Zhipeng Kang , Yong Liu , Teng Wang , Chunhou Li , Hongyu Xie , Jinfa Zhao , Jianzhong Shen , Hai Huang , Yu Liu , Qiuying Han , Yanqiao Wang

Elucidating the mechanisms that underlie the formation of fish otolith shapes presents a significant challenge in ecology. To address this issue, this study focuses on three dominant parrotfish species (Chlorurus sordidus, Scarus oviceps, and Scarus forsteni) in the waters of the Qilianyu Islands, Xisha Islands, China. Elliptical Fourier analysis was employed to investigate the shape changes of otoliths in these three parrotfish species over the period from 2018 to 2024. Additionally, stable isotope techniques were employed to analyze the relationship between otolith shape and diet. The results indicated that the analysis of morphospace occupation confirmed the temporal stability of parrotfish otolith shapes from 2018 to 2024. Results from the hierarchical multivariate models validated a significant contribution of diet to the morphological variations in parrotfish otoliths. Among these factors, the contribution of δ¹³C, which represents the food source, to the variations in parrotfish otolith shapes was found to be insignificant. In contrast, δ¹⁵N, which reflects the individual’s trophic level, exhibited a significant contribution. Notably, the contribution of δ¹⁵N in C. sordidus was most pronounced concerning the variations in otolith shape, consistent with its feeding strategy. These findings offer a theoretical framework for understanding the mechanisms underlying otolith shape formation and present a novel methodological approach for investigating the relationship between otolith shape and diet. This research carries significant theoretical implications and practical applications.

阐明鱼耳石形状形成的机制是生态学中的一个重大挑战。采用椭圆傅立叶分析研究了这三种鹦嘴鱼在2018年至2024年期间耳石的形状变化。此外，利用稳定同位素技术分析了耳石形状与饮食之间的关系。结果表明，形态空间占用分析证实了鹦嘴鱼耳石形状在2018 - 2024年间的时间稳定性。分层多变量模型的结果验证了饮食对鹦嘴鱼耳石形态变化的重要贡献。其中，代表食物来源的δ13C对鹦嘴鱼耳石形状变化的贡献不显著。而反映个体营养水平的δ15N则有显著贡献。值得注意的是，δ15N对石耳石形状变化的贡献最为显著，这与石耳石的摄食策略一致。这些发现为理解耳石形状形成机制提供了理论框架，并为研究耳石形状与饮食之间的关系提供了一种新的方法方法。本研究具有重要的理论意义和实际应用价值。

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引用次数: 0

The importance of lab testing tracking tag burden: A case study using small, juvenile red drum 实验室测试跟踪标签负担的重要性：以小红鼓为例

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-03 DOI: 10.1016/j.fishres.2025.107580

Sarah Ramsden , Mark A. Albins , Ronald Baker

According to the often cited “2 % Rule,” the weight of a tracking tag should not exceed 2 % of the weight of the fish that carries it. However, there is a growing body of evidence that this rule is too conservative for many species and that acceptable tag burden should be determined on a species-by-species basis. The aim of this study was to determine if red drum Sciaenops ocellatus smaller than those that have previously been tracked using acoustic telemetry (114–187 mm standard length) can carry tracking tags weighing more than 2 % of their body weight. We compared the growth and survival of red drum exposed to one of three treatments: (1) tagged (n = 15) – implanted with a dummy VEMCO V7–2L transmitter tag (tag to body weight ratios ranging from 1.4 % to 5.6 %); (2) sham (n = 14) – underwent identical tagging surgery with no tag insertion; or (3) control (n = 14) – handled only for measurements. Five fish died during the experiment (4 tagged, 1 control), but these were mostly larger individuals, and mortality of the tagged fish appeared to be due to surgeon error. Tagged fish grew more slowly than control fish during the first 10 days after surgery, but growth over the next two weeks compensated for this initial lag, and after 24 days there were no differences in growth among treatments. This provides evidence that the 2 % Rule is probably too conservative for red drum. However, in the case of red drum, we recommend that the first 10 days of tracking data after surgery be excluded from analyses and, in general, we recommend that researchers use caution when interpreting movement data collected immediately after tagging, as fish may still be recovering from handling effects.

根据经常被引用的“2 %规则”，跟踪标签的重量不应超过携带它的鱼重量的2 %。然而，越来越多的证据表明，这一规则对许多物种来说过于保守，可接受的标签负担应以物种为基础确定。本研究的目的是确定比以前使用声波遥测技术跟踪的红桶梭子鱼（114-187 毫米标准长度）更小的红桶梭子鱼是否可以携带重量超过其体重2 %的跟踪标签。我们比较了暴露于三种处理之一的红桶的生长和存活率：(1)标记（n = 15）-植入虚拟VEMCO V7-2L发射器标签（标签与体重的比率从1.4 %到5.6 %）；(2) sham (n = 14)-进行相同的标签手术，未插入标签；或(3)控制（n = 14）-仅用于测量。实验期间有5条鱼死亡（4条被贴上标签，1条作为对照），但这些鱼大多是体型较大的个体，被贴上标签的鱼的死亡似乎是由于外科医生的失误。在手术后的前10天，标记鱼的生长速度比对照鱼慢，但接下来两周的生长弥补了最初的滞后，24天后，不同处理之间的生长没有差异。这提供了2 %规则对于红鼓来说可能过于保守的证据。然而，在红鼓鱼的情况下，我们建议将手术后头10天的跟踪数据排除在分析之外，一般来说，我们建议研究人员在解释标记后立即收集的运动数据时要谨慎，因为鱼可能仍在从处理影响中恢复。

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引用次数: 0

Post-release predation of hatchery reared marbled flounder Pseudopleuronectes yokohamae in Hiroshima Bay, Japan 日本广岛湾孵化场饲养的横滨大理石纹比目鱼放生后的捕食

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-03 DOI: 10.1016/j.fishres.2025.107589

Yukako Namikawa, Takeshi Tomiyama

Post-release survival of hatchery-reared juveniles is critical for the success of stock enhancement programs. This study investigated predation on released juveniles of marbled flounder Pseudopleuronectes yokohamae in an estuary in Hiroshima Bay, Japan, using gill nets. A total of one Chondrichthyes, 11 Osteichthyes, and three Malacostraca piscivorous species were collected, and released juveniles were found in the stomach of a Japanese seabass Lateolabrax japonicus (385 mm total length). In a laboratory experiment, predation on hatchery-reared marbled flounder by Japanese mitten crab Eriocheir japonica, which aggregated for spawning, was observed. These findings suggest that shallow estuarine environments may be suboptimal habitats, at least seasonally, for released juveniles due to the risk of post-release predation.

在孵化场饲养的幼鱼放生后的存活对种群增加计划的成功至关重要。本研究利用刺网研究了日本广岛湾河口放生的横滨牙鲆幼鱼的捕食情况。共捕获软骨鱼目1种、骨鱼目11种、鱼食鱼目3种，并在全长385 mm的日本鲈鱼（Lateolabrax japonicus）胃内发现放生幼鱼。在室内实验中，观察了聚集产卵的日本绒螯蟹对孵化场饲养的大理石纹比目鱼的捕食。这些发现表明，对于释放的幼鱼来说，浅河口环境可能不是最理想的栖息地，至少在季节性上是如此，因为释放后有被捕食的风险。

引用次数: 0

Integrating a seabird diet-derived recruitment index into a stock assessment model of Atlantic herring in the Northeast U.S. 将海鸟饮食衍生的招募指数整合到美国东北部大西洋鲱鱼种群评估模型中

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-10-30 DOI: 10.1016/j.fishres.2025.107571

Sean B. Hardison , Jonathan Deroba , Micah Dean , Lauren Scopel , Joana Romero , Heather L. Major , Donald E. Lyons

Incorporating predator-prey information in fisheries stock assessments is challenging due to the multitude, complexity, and dynamic nature of trophic interactions. However, integrating indices of abundance derived from predator diet data into assessment models as proxy abundance indices of poorly sampled age classes may have utility as an ecosystem approach that improves assessment outcomes. Here, we leveraged 34 years of observations of common terns (Sterna hirundo) provisioning age-1 Atlantic herring (Clupea harengus) to their chicks across 12 islands in the Gulf of Maine to construct an annual index of herring provisioning rates. We then integrated this index into a state-space, age-structured assessment model as an index for age-1 Atlantic herring (recruit) abundance. Our results showed that when the assessment model was fit assuming a linear relationship between the herring provisioning index and recruitment, the model produced a residual pattern indicating a non-linear response between the provisioning of Atlantic herring and their abundance in the environment. These findings suggested that Atlantic herring provisioning rates plateaued during periods of high recruitment (satiation) and remained consistent at low levels during periods of low recruitment (hyperstability). Allowing for this non-linearity in the stock assessment improved the fit to the index. Ultimately, the seabird diet index may be a useful indicator to incorporate into the Atlantic herring assessment process; however, the quantitative incorporation of this index into the assessment model is challenged by non-linear predator-prey dynamics.

由于营养相互作用的多样性、复杂性和动态性，将捕食者-猎物信息纳入渔业种群评估是具有挑战性的。然而，将来自捕食者饮食数据的丰度指数整合到评估模型中，作为样本不足的年龄类别的代理丰度指数，可能作为一种改善评估结果的生态系统方法具有实用性。在这里，我们利用34年来对缅因湾12个岛屿上常见燕鸥（Sterna hirundo）供应年龄为1岁的大西洋鲱鱼（Clupea harengus）对其幼仔的观察，构建了鲱鱼供应率的年度指数。然后，我们将该指数整合到一个状态空间、年龄结构的评估模型中，作为1岁大西洋鲱鱼（招募）丰度的指数。结果表明，当评估模型假设鲱鱼供应指数与招募量之间存在线性关系时，模型产生的残差模式表明大西洋鲱鱼的供应与环境中鲱鱼的丰度之间存在非线性响应。这些发现表明，大西洋鲱鱼供应率在高招募期（饱和期）趋于稳定，在低招募期（超稳定期）保持在低水平。考虑到库存评估中的这种非线性，改进了对指数的拟合。最终，海鸟饮食指数可能是一个有用的指标纳入大西洋鲱鱼的评估过程；然而，将该指标定量纳入评估模型受到非线性捕食者-猎物动力学的挑战。

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引用次数: 0

A data-limited approach for assessing Octopus mimus Gould, 1852 (Cephalopoda: Octopodidae) in the northern zone of Chile 评估智利北部地区1852年章鱼（头足纲：章鱼科）的数据有限方法

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-10-29 DOI: 10.1016/j.fishres.2025.107578

Luis A. Cubillos , Paulo Mora , Andrés Olguín , Nancy Barahona , Miguel Araya , Christian M. Ibañez

In northern Chile, Octopus mimus sustains small-scale fisheries from Arica (18°28’ S) to Huasco (28°33’ S), yet stock assessment remains a challenge owing to data limitations. This study applied a data-limited approach, recognizing that stock assessment is a continuum from status classification analysis to quantitative models, improving data analysis. We used landings records (1979–2022) and applied maximum catch benchmarks, structural time-series analysis, and catch-only models to infer stock conditions. A spatiotemporal Bayesian hierarchical CPUE model produced a standardized abundance index for 2001–2022. These data informed JABBA, a Bayesian surplus production model that revealed a consistent overfished status. Although signs of overfishing have persisted, a notable decline in fishing mortality was observed by 2022. Despite the elevated uncertainty in recent years, retrospective analysis confirmed the robustness of the model. While our approach assumes fixed reference points, the observed structural shifts in landings suggest a potential decline in productivity during the cold period after 1998, which would affect either the carrying capacity or growth rates, warranting further investigation. This study highlights the utility of robust data-limited tools for managing small-scale fisheries under uncertainty.

在智利北部，从Arica（18°28′S）到Huasco(28°33′S)，章鱼维持着小规模渔业，但由于数据有限，种群评估仍然是一项挑战。本研究采用了数据有限的方法，认识到种群评估是一个从状态分类分析到定量模型的连续体，改进了数据分析。我们使用了1979-2022年的着陆记录，并应用了最大捕获量基准、结构时间序列分析和仅捕获量模型来推断种群状况。利用时空贝叶斯分层CPUE模型生成了2001-2022年的标准化丰度指数。这些数据为JABBA提供了信息，这是一个贝叶斯剩余生产模型，揭示了持续的过度捕捞状态。尽管过度捕捞的迹象持续存在，但到2022年，捕捞死亡率显著下降。尽管近年来不确定性增加，但回顾性分析证实了模型的稳健性。虽然我们的方法假设了固定的参考点，但观察到的着陆结构变化表明，1998年之后的寒冷时期生产率可能会下降，这将影响到承载能力或增长率，值得进一步调查。这项研究强调了在不确定情况下管理小规模渔业的可靠的数据有限工具的效用。

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引用次数: 0

Life history aspects of the small freshwater shrimp, Macrobrachium lanchesteri species complex (Palaemonidae) 淡水小虾兰氏沼虾种复合体的生活史研究

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-10-29 DOI: 10.1016/j.fishres.2025.107569

Minoru Saito , Chaiwut Grudpan , Jarungjit Grudpan , Achara Jutagate , Satoshi Honda , Tuantong Jutagate

Lanchester’s Freshwater Prawn Macrobrachium lanchesteri species complex is a commercial freshwater shrimp widely distributed and commonly consumed throughout the Indochinese Peninsula. We investigated the baseline life history of this species complex, including reproductive aspects, recruitment, and growth patterns. Shrimp samples were collected monthly from an oxbow lake in Northeast Thailand. Egg-carrying females were present throughout the year. Reproduction was most active between June and August and least active between November and December. The least active period of reproduction coincided with the winter solstice. The carapace length of ovigerous females ranged from 4.6 to 10.9 mm. Newly recruited individuals of both sexes mainly appeared between September and November. The recruited females were observed to reach maturity between March and May, i.e., less than one year after hatching, and continued to reproduce until they reached a maximum carapace length of approximately 11 mm. We discuss the effectiveness of current fisheries regulations and propose potential additional fisheries regulations based on the results of our study.

兰彻斯特淡水对虾（lanchestermacrobrachium lanchesteri）是一种广泛分布于印度支那半岛的商业淡水对虾。我们调查了该物种复合体的基线生活史，包括生殖方面，招募和生长模式。每月从泰国东北部的一个牛轭湖收集虾样本。携带卵子的雌企鹅全年都有。繁殖在6 - 8月最活跃，11 - 12月最不活跃。繁殖最不活跃的时期正好是冬至。卵生雌虫甲壳长度为4.6 ~ 10.9 mm。新招募的个体主要出现在9月至11月。被招募的雌性在3月至5月之间，即在孵化后不到一年的时间内达到成熟，并继续繁殖，直到它们的最大甲壳长度达到约11 毫米。我们讨论了当前渔业法规的有效性，并根据我们的研究结果提出了潜在的额外渔业法规。

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引用次数: 0

Elevated participation in co-management increases the willingness of stalked barnacle harvesters to adopt highly restrictive and spatially explicit management strategies 共同管理参与率的提高增加了藤壶采集者采用高度限制性和空间明确管理策略的意愿

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-10-25 DOI: 10.1016/j.fishres.2025.107566

Katja J. Geiger , Antonella Rivera , Alba Aguión , Marine Barbier , Teresa Cruz , Susana Fandiño , Lucía García-Flórez , Gonzalo Macho , Francisco Neves , Nélia Penteado , Paloma Peón Torre , Eric Thiébaut , Elsa Vázquez , José Luis Acuña

Ensuring the sustainability of European stalked barnacle fisheries requires effective management strategies. Insights into the experience of resource users with different management strategies can help to assess their success. To explore the opinion of the harvesters on the management of local fisheries, we conducted a multi-regional survey in Spain, Portugal and France with varying degrees of co-management. We analysed their responses using a multinomial logistic regression to understand what drove the observed differences. No single optimal strategy to achieve sustainability emerged, and the analysis revealed that geographic region was the most significant variable explaining the preferences of harvester. In less developed co-management systems they favored general input and output restrictions and expressed a desire for greater involvement in co-management processes. Conversely, in highly developed co-management systems with Territorial User Rights for Fishers (TURFs) they preferred the most restrictive and spatially explicit management strategies, such as implementing harvest bans and establishing marine reserves. These preferences indicate that harvesters in TURF-based systems exhibit a high level of stewardship and commitment to sustainable resource management. Moreover, our results indicate that the majority of harvesters in the regions in Portugal and France, areas with less developed co-management, are willing to make changes to current management strategies, reflecting their awareness of the need for improvement. To enhance the development of sustainable management practices across the distributional range of fishery resources, management strategies do not only need to be tailored to each region's particular practices, needs, and characteristics, but also consider the readiness of resource users for specific strategies.

确保欧洲藤壶渔业的可持续性需要有效的管理策略。深入了解采用不同管理策略的资源使用者的经验，有助于评估其成功与否。为了探讨渔民对当地渔业管理的看法，我们在西班牙、葡萄牙和法国进行了一项多区域调查，这些地区的共同管理程度不同。我们使用多项逻辑回归分析了他们的反应，以了解导致观察到的差异的原因。没有单一的最优策略来实现可持续性，分析表明，地理区域是解释采集者偏好的最重要变量。在较不发达的共同管理制度中，它们赞成一般的投入和产出限制，并表示希望更多地参与共同管理进程。相反，在具有渔民领土使用权的高度发达的共同管理制度中，他们倾向于最具限制性和空间明确的管理战略，例如执行捕捞禁令和建立海洋保护区。这些偏好表明，在草皮为基础的系统中，收割机表现出高水平的管理和对可持续资源管理的承诺。此外，我们的研究结果表明，葡萄牙和法国这些共同管理欠发达地区的大多数采收者都愿意改变目前的管理策略，这反映了他们意识到需要改进。为了在整个渔业资源分布范围内加强可持续管理做法的发展，管理战略不仅需要适应每个区域的具体做法、需要和特点，而且还要考虑到资源使用者对具体战略的准备情况。

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引用次数: 0

Autoecology and population dynamics of smooth sandeel (Gymnammodytes semisquamatus (Jourdain, 1879)) in the Maritime-Terrestrial National Park of the Atlantic Islands of Galicia (NW of Spain) 西班牙西北部加利西亚大西洋群岛海陆国家公园裸沙鳗（Gymnammodytes semisquamatus, Jourdain, 1879）的自生态和种群动态

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-10-24 DOI: 10.1016/j.fishres.2025.107570

José M. Parada , Beatriz Nieto

This paper studies the autoecology and population dynamics of Gymnamodytes semisquamatus (Jourdain, 1879) in southern Europe. Because of its major fisheries importance, studies of sandeels have focused on other species, and G. semisquamatus has been little studied. However, this species is very important as a forage species, especially in the case of the population studied, as it occurs in a national park that hosts breeding colonies of endangered seabirds and a wide diversity of piscivorous species. G. semisquamatus buries itself in the sediment at night, although it is active in the water column on clear nights with strong moonlight. Its spatial distribution, size-weight ratio, condition index and growth suggest a period of reduced activity during autumn and winter when it is buried in the sand. During these seasons, it is concentrated in deeper locations and has stricter requirements for sediment characteristics, making it more vulnerable to loss or damage in its preferred habitat. Knowledge of this seasonality, which is common to all other ammodytid species, is important for stock assessment and the study of sandeel populations.

本文研究了南欧Gymnamodytes semisquamatus （Jourdain, 1879）的自生态和种群动态。由于其对渔业的重要意义，对沙鳗的研究主要集中在其他物种上，而对半沙鳗的研究很少。然而，这个物种作为一种饲料是非常重要的，特别是在研究的种群中，因为它发生在一个国家公园里，那里有濒危海鸟的繁殖地和各种各样的鱼食性物种。G. semiquamatus在夜间隐藏在沉积物中，但在月光强烈的晴朗夜晚，它在水柱中活跃。其空间分布、体积重量比、状态指数和生长情况表明，在秋冬两季被埋沙后，其活动减少。在这些季节，它集中在较深的位置，对沉积物特征有更严格的要求，使其更容易失去或破坏其首选栖息地。了解这种季节性，这是所有其他种类的常见的，是重要的种群评估和研究沙棘种群。

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引用次数: 0