Fisheries Research最新文献_第6页

Localized gut tissue and digesta bacterial communities of five pelagic fish species from the Atlantic Ocean: Insights from 16S rRNA gene diversity 大西洋五种中上层鱼类的肠道组织和消化道细菌群落：来自16S rRNA基因多样性的见解

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-14 DOI: 10.1016/j.fishres.2025.107594

José Luis Varela , Eleni Nikouli , Antonio Medina , Sokratis Papaspyrou , Konstantinos Kormas

Gut microbes are now considered inseparable from their hosts. Compared to farmed fish, gut microorganisms of wild-living fish are largely understudied despite they constitute the natural microbiome fully adapted to the host’s natural life mode. In this study, we investigated for the first time whether the gut bacterial microbiota, based on 16S rRNA gene diversity, of the Atlantic Ocean fast-swimming fish Auxis sp., Coryphaena hippurus, Euthynnus alletteratus, Kajikia albida and Sarda sarda, differentiate among their proximal, intermediate and distal gut sections. Between 61 and 247 operational taxonomic units (OTUs) were found in each gut section, with the highest numbers mostly in the distal section. The most important OTUs belonged to the Acinetobacter, Bacillus, Corynebacteriales, Cutibacterium, Escherichia-Shigella, Lactobacillus, Massilia, Photobacterium, Pirellulaceae, Shewanella, Staphylococcus, Streptococcus, Synechococcus, Weissella, Xanthomonas taxa, most of which occur frequently in the gut of many fish, while a few additional OTUs remained unaffiliated. The bacterial communities differed significantly between the gut sections while a distinct turnover of unique and newly appearing/disappearing OTUs were found along the gut sections transition. Bacterial presumptive metabolic pathways with considerable abundance changes along the gut sections included polysaccharide and protein degradation, fermentation and vitamins biosynthesis. In E. alletteratus, the comparison between the microbiota of each gut section with its respective digesta microbiota, showed that the highest overlap (34.2 %) occurred in the distal part of the gut. Overall, this study showed that in some wild fish, gut microbiota is considerably localized for both their taxonomic and potential metabolic profiles.

肠道微生物现在被认为与其宿主密不可分。与养殖鱼类相比，野生鱼类的肠道微生物构成了完全适应宿主自然生活模式的天然微生物群，但对它们的研究在很大程度上还不够充分。本研究首次基于16S rRNA基因多样性，研究了大西洋快游鱼Auxis sp.、Coryphaena hippurus、Euthynnus alletteratus、Kajikia albida和Sarda Sarda的肠道微生物群在近端、中端和远端肠道部分是否存在分化。各肠段共发现61 ~ 247个操作分类单位（otu），以远端部分数量最多。最重要的otu属于不动杆菌、芽孢杆菌、杆状杆菌、表皮杆菌、埃希氏志贺氏菌、乳酸杆菌、Massilia、光杆菌、Pirellulaceae、Shewanella、葡萄球菌、链球菌、聚球菌、Weissella、黄单胞菌等分类群，其中大多数经常出现在许多鱼类的肠道中，而其他一些otu则未附属于肠道。肠道各部分之间的细菌群落差异显著，而在肠道各部分的过渡过程中，发现了独特的和新出现/消失的otu的明显更替。细菌沿肠道部分推定的代谢途径有相当大的丰度变化，包括多糖和蛋白质降解、发酵和维生素生物合成。在长叶螺旋藻中，各肠道部分的微生物群与其食糜微生物群的比较表明，肠道远端部分重叠最多（34.2% %）。总的来说，这项研究表明，在一些野生鱼类中，肠道微生物群在分类和潜在代谢方面都相当局限。

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引用次数: 0

Beyond fish: Social outcomes of Maritimes region atlantic salmon hatcheries and stocking programs through a social-ecological systems lens 超越鱼类：海洋地区大西洋鲑鱼孵化场和放养计划的社会结果，通过社会生态系统的镜头

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-14 DOI: 10.1016/j.fishres.2025.107579

Michael T. Fabiano , Hannah L. Harrison

Atlantic salmon and people have been inextricably linked in North American since time immemorial. Interactions between salmon and humans are social-ecological systems comprised of complex interactions between social and biophysical agents interacting at heterogeneous spatial and temporal scales, and through technologies such as hatchery and stocking programs. As salmon populations have declined in the Maritime provinces, hatcheries have been viewed as both solution and challenge toward restoring Atlantic salmon populations. While the multifaceted ecological and genetic impacts of salmon stocking are well established in the scientific literature, hatcheries are still operational and valued by communities in the Maritime provinces today. A growing body of social science literature has explored the psychological, social, and conservation reasons for continued use of these facilities for salmon conservation, and the present study contributes to that discussion through a relational lens. We find that hatcheries and stocking programs are contributing to human-salmon relationships in socially desirable ways, including as a tangible conservation action for stakeholders dealing with ecological grief and anxiety, economic loss, and stewardship loss due to declining regional salmon populations. We demonstrate how hatcheries could be understood to contribute to social resilience during ecological loss, though they may simultaneously detract from ecological (particularly genetic) resilience. We conclude with a discussion of whether and how these social outcomes can be considered by decision makers in a time of evolving salmon conservation policy in the region.

在北美，大西洋鲑鱼和人类自古以来就有着千丝万缕的联系。鲑鱼与人类之间的相互作用是一个社会生态系统，由社会和生物物理因素之间的复杂相互作用组成，这些因素在不同的空间和时间尺度上相互作用，并通过孵化场和放养计划等技术相互作用。随着沿海省份鲑鱼数量的下降，孵化场被视为恢复大西洋鲑鱼数量的解决方案和挑战。虽然鲑鱼放养的多方面生态和遗传影响已在科学文献中得到充分证实，但孵化场今天仍在运作，并受到沿海省份社区的重视。越来越多的社会科学文献探讨了继续使用这些设施来保护鲑鱼的心理、社会和保护原因，本研究通过相关的视角为这一讨论做出了贡献。我们发现孵化场和放养计划以社会理想的方式促进了人类与鲑鱼的关系，包括作为一种切实的保护行动，为利益相关者处理生态悲伤和焦虑，经济损失，以及由于区域鲑鱼数量下降而导致的管理损失。我们证明了在生态丧失期间，孵化场如何有助于社会恢复，尽管它们可能同时损害生态（特别是遗传）恢复力。最后，我们讨论了在该地区不断发展的鲑鱼保护政策中，决策者是否以及如何考虑这些社会结果。

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引用次数: 0

Spatio-temporal feeding patterns of the Atlantic chub mackerel (Scomber colias) in a Southwest Atlantic coastal marine ecosystem (39–42°S) 西南大西洋沿海生态系统（39 ~ 42°S）大西洋鲐鱼的时空摄食模式

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-12 DOI: 10.1016/j.fishres.2025.107596

Luciano N. Padovani , Brenda Temperoni , Paula Orlando , Germán E. Buratti , Claudio C. Buratti

Small- to medium-sized pelagic fish like the Atlantic chub mackerel (Scomber colias) are key trophic connectors in marine ecosystems and a valuable fishery resource. In the Argentine Continental Shelf, two stocks are recognized, but little is known about the southern stock inhabiting the El Rincón (ER) coastal ecosystem (39–42°S). This study presents the first quantitative analysis of the spatio-temporal feeding patterns of S. colias in this region, based on stomach content analysis. We quantified diet composition, feeding intensity, and trophic level, and assessed the influence of body size and reproductive stage. The diet was predominantly zooplanktivorous, with copepods (mainly Calanidae) as dominant prey, supplemented by hyperiid amphipods. Diet composition and feeding intensity varied seasonally and spatially, in line with regional patterns of zooplankton abundance and quality. Higher feeding activity and consumption of large copepods and amphipods occurred in late spring in stratified mid-shelf waters, whereas low feeding levels were recorded in winter in coastal zones. Size-related dietary shifts were evident: larger individuals consumed greater quantities of prey, including larger zooplankton such as Themisto gaudichaudii, likely using particulate feeding. Findings may suggest the existence of two distinct seasonal habitats: a wintering ground with reduced metabolic and foraging activity, and a feeding ground associated with high zooplankton biomass, implying possible movements of schools. The proposed feeding strategies underscore the species’ capacity to maximize resource use and foraging efficiency. This study enhances understanding of the trophic ecology of S. colias and provides a baseline for future research and ecosystem-based fisheries management.

大西洋鲐鱼等中小型中上层鱼类是海洋生态系统中重要的营养连接器，也是宝贵的渔业资源。在阿根廷大陆架，已知有两个种群，但对居住在El Rincón （ER）沿海生态系统（39-42°S）的南部种群知之甚少。本研究首次在胃内容物分析的基础上，定量分析了该地区大肠杆菌的时空摄食模式。我们量化了饲料组成、饲养强度和营养水平，并评估了体型和繁殖阶段的影响。饮食以浮游动物为主，以桡足类（主要为鱿鱼科）为优势猎物，辅之以杂交片足类。饵料组成和摄食强度随季节和空间的变化而变化，符合浮游动物丰度和质量的区域格局。中陆架分层水域的大型桡足类和片足类动物的摄食活动和食用量在春末较高，而沿海地区的摄食活动和食用量在冬季较低。与体型相关的饮食变化是显而易见的：体型较大的个体消耗更多的猎物，包括体型较大的浮游动物，如蹼足动物，可能使用颗粒捕食。研究结果可能表明存在两个不同的季节性栖息地：一个是代谢和觅食活动减少的越冬地，另一个是浮游动物生物量高的觅食地，这意味着可能有鱼群的移动。提出的喂养策略强调了物种最大限度地利用资源和觅食效率的能力。本研究提高了人们对大鲵营养生态学的认识，为今后的研究和基于生态系统的渔业管理提供了基础。

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引用次数: 0

Effects of model misspecification and data availability on spatially-explicit assessment model performance 模型错配和数据可用性对空间显式评价模型性能的影响

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-11 DOI: 10.1016/j.fishres.2025.107590

Samara Nehemiah , Amy M. Schueller , Michael J. Wilberg

Simulation studies are useful for determining the implications of available data and mis-specified model structure on the accuracy of model estimates of abundance and fishing mortality. Spatially-explicit multi-stock, age-structured stock assessment models have not been evaluated to understand how the accuracy of model estimates is affected by different assumptions of stock structure, age composition, and movement, compared to current methods used to inform management decisions. Our objective was to evaluate the accuracy of spatially-explicit multi-stock and spatially-implicit single stock assessment models for striped bass under alternative scenarios of data availability and quality. We conducted a simulation study to evaluate the accuracy of spatial assessment models under alternative scenarios of data quality and appropriateness of assumptions including investigating the effect of ageing error on model accuracy. A range of estimation models with alternative assumptions about spatial dynamics, stock composition, and ageing error were fitted to the datasets. Spatially-explicit estimates were approximately unbiased in estimating abundance and fishing mortality when they closely matched the assumptions of the data generating model and accounted for ageing error. Data to inform stock composition or informative priors on occupancy probabilities were necessary for the spatially-explicit models, but estimates were sensitive to correct specification of the occupancy probability priors. Models that ignored potential ageing error in datasets resulted in biased and inaccurate estimates of abundance and fishing mortality. All models provided inaccurate estimates of reference points, although estimates from spatially-explicit models were the least biased. Spatially-explicit stock assessments can potentially improve accuracy of estimates when they match spatial dynamics of fish populations and when ageing error was corrected.

模拟研究有助于确定现有数据和指定错误的模型结构对丰度和捕捞死亡率模型估计准确性的影响。与目前用于管理决策的方法相比，尚未对空间明确的多种群、年龄结构的种群评估模型进行评估，以了解模型估计的准确性如何受到不同种群结构、年龄组成和运动假设的影响。我们的目的是在不同的数据可用性和质量条件下，评估空间显式多种群和空间隐式单种群评估模型对条纹鲈鱼的准确性。我们进行了一项模拟研究，以评估在数据质量和假设适当性的替代情景下空间评估模型的准确性，包括调查老化误差对模型准确性的影响。对数据集拟合了一系列具有空间动态、种群组成和老化误差等可选假设的估计模型。当空间显式估计与数据生成模型的假设密切匹配并考虑到老化误差时，它们在估计丰度和捕捞死亡率方面几乎是无偏的。对于空间显式模型来说，为种群组成或占用概率先验提供信息的数据是必要的，但估计对占用概率先验的正确规范很敏感。忽略数据集中潜在的老化误差的模型导致对丰度和捕捞死亡率的估计有偏差和不准确。所有模型都提供了对参考点的不准确估计，尽管空间显式模型的估计偏差最小。当空间明确的种群评估与鱼类种群的空间动态相匹配并修正了老化误差时，可以潜在地提高估计的准确性。

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引用次数: 0

Biometric relationships as a fisheries management tool: A case study on the bullseye puffer (Sphoeroides annulatus) in an artisanal fishery 作为渔业管理工具的生物特征关系：以手工渔业中的靶心河豚为例研究

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-11-10 DOI: 10.1016/j.fishres.2025.107593

Hugo Aguirre-Villaseñor , Enrique Morales-Bojórquez , Miguel Ángel Cisneros-Mata

In artisanal fisheries, many species are marketed in diverse commercial presentations, yet few biometric relationships exist to predict live weight from landed categories. Typically, biometric relationships are analysed using ordinary least squares (OLS), but outliers can violate OLS assumptions. Robust regression model (RRM) is designed to minimize the impact of outliers and larger residuals, leading to more reliable and accurate results. Using the bullseye puffer Sphoeroides annulatus as a case study, we developed RRM to predict: a) live weight from different landed categories, b) fillet yield from body measurements, and c) the utility of fillet yield as a management reference point. Sampling 1397 individuals from Sinaloa, Mexico (2014–2015), we fitted nine morphological relationships with high precision

({R^{2}}_{adjusted} \geq 0.97)

. Our conversions highlighted significant underreporting in the 2023 Mexican Pacific landings, with official records showing 1368 metric tons that underestimated live weight by approximately 950 tons. The largest discrepancies were found in fresh-gutted landings (449 versus 1007 tons) and frozen-gutted landings (361 versus 813 tons). Fillet yield analyses established a 250 g benchmark for recreational fisheries (limit 5 fish/day), requiring a minimum total length

(L_{T})

of 20 cm fillet weight

(W_{fi} \approx 50 g / fish)

to achieve this without exceeding bag limits. Smaller fish would necessitate keeping more than five individuals. Provides standardized conversion factors and intuitive benchmarks, enhancing data quality for stock assessments in data-poor artisanal fisheries. By addressing underreporting and linking fillet yield to maturity-based reference points, these tools support sustainable management policies, such as size limits to optimize yield and protect spawning stocks.

在手工渔业中，许多鱼种以不同的商业形式销售，但很少有生物计量关系可以预测上岸鱼种的活重。通常，使用普通最小二乘（OLS）分析生物特征关系，但异常值可能违反OLS假设。鲁棒回归模型（Robust regression model， RRM）旨在将异常值和较大残差的影响降到最低，从而使结果更加可靠和准确。以圆孔河豚（Sphoeroides annulatus）为例，我们开发了RRM来预测：a)来自不同养殖类别的活重，b)来自身体测量的鱼片产量，以及c)鱼片产量作为管理参考点的效用。2014-2015年在墨西哥锡那罗亚采集1397个个体，拟合了9个形态关系，r2调整后精度≥0.97。我们的转换强调了2023年墨西哥太平洋登陆的严重低估，官方记录显示1368公吨低估了约950吨的活重。最大的差异出现在新鲜内脏着陆（449对1007吨）和冷冻内脏着陆（361对813吨）。鱼片产量分析为休闲渔业确立了250克的基准（每天限制5条鱼），要求最低总长度LT为20厘米鱼片重量Wfi≈50克/条鱼，才能在不超过袋限制的情况下实现这一目标。较小的鱼需要养5条以上。提供标准化的换算因子和直观的基准，提高数据贫乏的手工渔业种群评估的数据质量。通过解决低报问题，并将鱼片产量与基于成熟度的参考点联系起来，这些工具支持可持续的管理政策，例如大小限制，以优化产量并保护产卵种群。

{"title":"Biometric relationships as a fisheries management tool: A case study on the bullseye puffer (Sphoeroides annulatus) in an artisanal fishery","authors":"Hugo Aguirre-Villaseñor , Enrique Morales-Bojórquez , Miguel Ángel Cisneros-Mata","doi":"10.1016/j.fishres.2025.107593","DOIUrl":"10.1016/j.fishres.2025.107593","url":null,"abstract":"<div><div>In artisanal fisheries, many species are marketed in diverse commercial presentations, yet few biometric relationships exist to predict live weight from landed categories. Typically, biometric relationships are analysed using ordinary least squares (OLS), but outliers can violate OLS assumptions. Robust regression model (RRM) is designed to minimize the impact of outliers and larger residuals, leading to more reliable and accurate results. Using the bullseye puffer <em>Sphoeroides annulatus</em> as a case study, we developed RRM to predict: a) live weight from different landed categories, b) fillet yield from body measurements, and c) the utility of fillet yield as a management reference point. Sampling 1397 individuals from Sinaloa, Mexico (2014–2015), we fitted nine morphological relationships with high precision <span><math><mrow><mfenced><mrow><msub><mrow><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow><mrow><mi>adjusted</mi></mrow></msub><mo>≥</mo><mn>0.97</mn></mrow></mfenced></mrow></math></span>. Our conversions highlighted significant underreporting in the 2023 Mexican Pacific landings, with official records showing 1368 metric tons that underestimated live weight by approximately 950 tons. The largest discrepancies were found in fresh-gutted landings (449 versus 1007 tons) and frozen-gutted landings (361 versus 813 tons). Fillet yield analyses established a 250 g benchmark for recreational fisheries (limit 5 fish/day), requiring a minimum total length <span><math><mrow><mfenced><mrow><msub><mrow><mi>L</mi></mrow><mrow><mi>T</mi></mrow></msub></mrow></mfenced></mrow></math></span> of 20 cm fillet weight <span><math><mrow><mfenced><mrow><msub><mrow><mi>W</mi></mrow><mrow><mi>fi</mi></mrow></msub><mo>≈</mo><mn>50</mn><mi>g</mi><mo>/</mo><mi>fish</mi></mrow></mfenced></mrow></math></span> to achieve this without exceeding bag limits. Smaller fish would necessitate keeping more than five individuals. Provides standardized conversion factors and intuitive benchmarks, enhancing data quality for stock assessments in data-poor artisanal fisheries. By addressing underreporting and linking fillet yield to maturity-based reference points, these tools support sustainable management policies, such as size limits to optimize yield and protect spawning stocks.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"292 ","pages":"Article 107593"},"PeriodicalIF":2.3,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145529196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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。

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