Fisheries Research最新文献_第7页

How fishing regulations, free time, seasonality and angler characteristics shape daily fishing pressure and angling success: Insights from Czech recreational fisheries 捕鱼法规、空闲时间、季节性和垂钓者特征如何影响日常捕鱼压力和钓鱼成功：来自捷克休闲渔业的见解

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-01 Epub Date: 2025-11-19 DOI: 10.1016/j.fishres.2025.107600

David Boukal , Roman Lyach , Jan Kubečka

Recreational fishing is a widespread leisure activity and an important source of fish mortality. Angler behaviour affects fishing pressure, but the causes of seasonal patterns of fishing pressure and success remain poorly understood. We used data from > 565,000 individual daily fishing trips in the three largest fishing areas in Czechia during three years to decipher the seasonal patterns of fishing pressure and success, including possible differences between angler groups defined by their proximity to the fishing area (‘local’, ‘regional’ and ‘distant’) and by the target fish based on their annual catches (anglers reporting no catches and those focussing on carp or predatory fish and generalists). We found that total fishing pressure was predictably seasonal in each area, showing a broadly unimodal pattern that peaked around week 30 and increased during weeks with short public holidays. Fishing pressure of the different angler groups responded differently to the open fishing season for predatory fish (16 June to 31 December each year), with the strongest positive effect found among anglers who focussed on predatory fish or who reported no catches from the three areas. Daily fishing success fluctuated throughout the season and varied greatly between anglers. Individual success declined with daily fishing pressure and increased with the angler’s total effort when anglers reporting no catches were included in the analysis. We also detected area- and year-specific differences in the individual success of both distance-based and catch-based angler groups, as well as area- and year-specific effects of the open fishing season for predatory fish on the individual success of catch-based angler groups. While seasonal patterns of fishing pressure were similar across years in each fishing area, our analysis identified area-specific patterns of short-term fishing pressure and individual success that could indicate shifts in angler preferences or possible overfishing. Overall, we show that external factors such as fishing regulations and public holidays directly influence the seasonality of fishing pressure and indirectly modulate the success of individual anglers. Our approach may pave the way for more detailed analyses of fine-scale temporal dynamics in recreational fisheries.

休闲钓鱼是一项广泛的休闲活动，也是鱼类死亡的重要原因。垂钓者的行为会影响捕鱼压力，但捕鱼压力和成功的季节性模式的原因仍然知之甚少。我们使用了来自>； 的数据，在三年中，在捷克三个最大的捕鱼区，每天有565,000个人钓鱼，以破译捕鱼压力和成功的季节性模式，包括钓鱼者群体之间的可能差异，这些差异是由他们与捕鱼区（“本地”，“区域”和“遥远”）的接近程度定义的，以及根据他们的年渔获量定义的目标鱼（钓鱼者报告没有渔获，那些专注于鲤鱼或掠食性鱼和通才）。我们发现，每个区域的总捕捞压力具有可预测的季节性，呈现出大致的单峰模式，在第30周左右达到峰值，并在公共假期较短的几周内增加。在每年6月16日至12月31日的开放捕食性鱼类季节，不同垂钓者群体的渔获压力有不同的反应，其中以捕食性鱼类为主的垂钓者或报告在这三个地区没有渔获的垂钓者的积极影响最强。每天的捕鱼成功率在整个季节波动，钓鱼者之间差异很大。个人成功随每日捕鱼压力的下降而下降，当分析中包括未捕获的垂钓者时，随垂钓者总努力的增加而增加。我们还发现了以距离为基础和以渔获为基础的垂钓者群体的个体成功在区域和年份上的差异，以及开放捕鱼季节对以渔获为基础的垂钓者群体的个体成功的区域和年份特异性影响。虽然每个渔区每年的季节性捕捞压力模式相似，但我们的分析确定了特定区域的短期捕捞压力模式和个体成功，这可能表明垂钓者偏好的变化或可能的过度捕捞。总体而言，我们发现钓鱼法规和公共假期等外部因素直接影响钓鱼压力的季节性，并间接调节个体垂钓者的成功。我们的方法可能为更详细地分析休闲渔业的精细尺度时间动态铺平道路。

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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 : 2025-12-01 Epub 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

Identifying key factors influencing the spatiotemporal variability of longline fishing activities in the Western and Central Pacific Ocean 确定影响中西太平洋延绳钓活动时空变异的关键因素

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-01 Epub Date: 2025-11-22 DOI: 10.1016/j.fishres.2025.107605

Shenglong Yang , Wei Wang , Shengmao Zhang , Yumei Wu , Heng Zhang , Xiumei Fan , Fenghua Tang , Fei Wang

Accurately understanding the dynamic changes in fishing activities and their influencing mechanisms is crucial for the conservation of marine biological resources and fisheries management. This study extracted fishing effort information from Automatic Identification System (AIS) data and integrated 19 oceanic environmental variables, including Sea Surface Temperature (SST), Finite Size Lyapunov Exponent (FSLE), Dissolved Oxygen (O2), and Distance to Shore (DSH), to construct an MCRU-Net neural network framework at multiple spatiotemporal scales for predicting the spatial distribution and intensity of fishing activities. Furthermore, an input variable importance evaluation method was developed to identify the key environmental factors influencing the spatiotemporal variations of longline fishing operations in the region. The results show that SST and FSLE are the most critical factors affecting the operational distribution of tuna longline vessels. The spatiotemporal scale significantly influences the model’s predictive accuracy: larger scales improve spatial prediction accuracy, while smaller scales are more suitable for accurately predicting fishing intensity. The proposed deep learning model effectively captures the spatiotemporal dynamics of fishing activities across different scales and accurately identifies critical environmental drivers, thereby providing a scientific basis and decision-making support for fisheries resource management and sustainable development.

准确认识渔业活动的动态变化及其影响机制，对海洋生物资源养护和渔业管理具有重要意义。本研究利用自动识别系统（AIS）数据提取捕捞努力量信息，综合海面温度（SST）、有限尺寸Lyapunov指数（FSLE）、溶解氧（O2）和岸距（DSH）等19个海洋环境变量，构建了多时空尺度MCRU-Net神经网络框架，用于预测捕捞活动的空间分布和强度。在此基础上，建立了一种输入变量重要性评价方法，以确定影响该地区延绳钓作业时空变化的关键环境因素。结果表明，海温和FSLE是影响金枪鱼延绳钓渔船作业分布的最关键因素。时空尺度对模型的预测精度影响显著，大尺度提高了空间预测精度，而小尺度更适合准确预测捕捞强度。该深度学习模型能有效捕捉不同尺度渔业活动的时空动态，准确识别关键环境驱动因素，为渔业资源管理和可持续发展提供科学依据和决策支持。

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引用次数: 0

Spawning stock recovery of Pacific bluefin tuna (Thunnus orientalis): Evidence from length, age and catch data of Taiwanese longline fishery in 2010–2023 太平洋蓝鳍金枪鱼（Thunnus orientalis）产卵种群恢复：来自2010-2023年台湾延绳钓渔业长度、年龄和捕捞数据的证据

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-01 Epub Date: 2025-11-14 DOI: 10.1016/j.fishres.2025.107602

Yu-Wen Lin , Yi-Jay Chang , Jhen Hsu , Owyn E. Snodgrass , Travis Richards , Jen-Chieh Shiao

Pacific bluefin tuna (Thunnus orientalis, PBF), a highly migratory and commercially important species, faces intense fishing pressure. Taiwanese PBF catches, which reached a nadir in 2012, gradually increased from 2014 onwards, culminating in a dramatic fivefold surge after 2019. This study analyzed the adult population from PBF landings in Taiwan from 2010 to 2023 to inform fisheries management. We found a strong correlation between declining juvenile catches in Japanese troll or purse seine fishery and increasing adult catches in Taiwanese and Japanese longline fishery, with a 7–9 year lag. Age estimation, using otolith annuli and age-length keys, revealed a temporal shift in age composition. Despite the substantial increase in Taiwanese catch size, the average age of landed PBF decreased. The spawning stock, previously dominated by older individuals (14–18 years), now primarily consisted of younger fish (8–12 years). Prior to 2014, most PBF measured between 220 and 240 cm in fork length; after 2017, this range generally decreased to 200–220 cm. Permutation test using fish size and otolith direct ageing data suggested a lower mean fork length at age for the PBF landed in the recent years compared to earlier years. Furthermore, a linear mixed model showed a relationship between fork length and fishing year, indicating a consistent decrease in fork length across all age groups. These results suggest that reduced fishing pressure on juvenile PBF (0–1 years old) has allowed more individuals to reach adulthood, contributing to the observed recovery of the spawning population. These findings provide valuable insights into the effective fishery management and PBF stock rebuilding in Taiwan and other regions.

太平洋蓝鳍金枪鱼（Thunnus orientalis， PBF）是一种高度洄游和具有重要商业价值的物种，面临着巨大的捕捞压力。台湾PBF捕获量在2012年达到最低点，从2014年开始逐渐增加，在2019年之后达到了惊人的5倍增长。本研究分析2010年至2023年台湾PBF上岸的成年种群，为渔业管理提供参考。研究发现，日本巨网或围网渔业的幼鱼捕获量下降与台湾和日本延绳钓渔业的成鱼捕获量增加之间存在较强的相关性，且存在7-9年的滞后。使用耳石环和年龄长度键进行年龄估计，揭示了年龄组成的时间变化。尽管台湾渔获量大幅增加，但上岸PBF的平均年龄却有所下降。产卵种群以前以年龄较大的个体（14-18岁）为主，现在主要由年龄较小的鱼类（8-12岁）组成。在2014年之前，大多数PBF的叉长在220 - 240 cm之间；2017年以后，这个范围普遍下降到200-220 cm。利用鱼的大小和耳石直接老化数据进行的排列测试表明，近年来着陆的PBF在年龄上的平均叉长比早些年要低。此外，线性混合模型显示了叉长与捕捞年份之间的关系，表明所有年龄组的叉长都一致减少。这些结果表明，对幼鱼（0-1岁）的捕捞压力的减少使更多的个体达到成年，有助于观察到产卵种群的恢复。这些发现为台湾及其他地区的有效渔业管理和PBF种群重建提供了有价值的见解。

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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 : 2025-12-01 Epub 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

Ghost fishing catch estimates based on annual retrieval operations in Norwegian waters 根据挪威水域每年的回收作业估算幽灵捕鱼的捕获量

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research

Pub Date : 2025-12-01 Epub Date: 2025-11-14 DOI: 10.1016/j.fishres.2025.107599

Dorian Vodopia , Francesca Verones , Cecilia Askham , Roger B. Larsen

Ghost fishing, the incidental capture of marine organisms by abandoned, lost and discarded fishing gear (ALDFG), poses a significant threat to marine ecosystems and biodiversity. Yet, comprehensive data on the ghost fishing catch in Norwegian waters, remains largely unavailable. To contribute to filling this data gap, we analyzed data from seven years (2018–2024) of retrieval operations targeting commercial derelict fishing gear. The ghost fishing catch consisted predominantly of Greenland halibut (Reinhardtius hippoglossoides), Northeast Arctic cod (Gadus morhua), edible crab (Cancer pagurus), red king crab (Paralithodes camtschaticus), and snow crab (Chionoecetes opilio). Additionally, cetaceans, elasmobranchs, and a pinniped were caught. In Norwegian waters, reported gillnet losses result in yearly ghost fishing catches of 566 tons under the best-case scenario, 990 tons under the intermediate scenario, and 3723 tons under the worst-case scenario. Generalized linear mixed effects models (GLMMs) indicated a significant reduction in ghost fishing catch at retrieval in derelict king crab pots following the introduction of escape mechanisms. This study highlights the substantial biomass and biodiversity loss in the Norwegian marine environment caused by ALDFG, impacting both commercially valuable and endangered species. It also documents the effectiveness of escape mechanisms in reducing ghost fishing catch in derelict pots.

幽灵捕鱼是指被遗弃、丢失和丢弃的渔具偶然捕获海洋生物，对海洋生态系统和生物多样性构成重大威胁。然而，关于挪威海域幽灵渔获量的全面数据在很大程度上仍然无法获得。为了填补这一数据空白，我们分析了针对商业废弃渔具的7年（2018-2024）检索操作的数据。鬼渔主要包括格陵兰大比目鱼（Reinhardtius hippoglossoides）、东北北极鳕鱼（Gadus morhua）、食用蟹（Cancer pagurus）、红王蟹（Paralithodes camtschaticus）和雪蟹（Chionoecetes opilio）。此外，还捕获了鲸类、板鳃类和鳍状目动物。在挪威水域，报告的刺网损失导致最佳情况下每年的幽灵捕捞量为566吨，中间情况下为990吨，最坏情况下为3723吨。广义线性混合效应模型（glmm）表明，引入逃逸机制后，在废弃的帝王蟹笼中回收幽灵渔获量显著减少。这项研究强调了aldgf在挪威海洋环境中造成的大量生物量和生物多样性损失，影响了商业价值和濒危物种。报告还记录了逃脱机制在减少废弃渔池的幽灵渔获量方面的有效性。

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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 : 2025-12-01 Epub 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

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 : 2025-12-01 Epub 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

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 : 2025-12-01 Epub 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

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 : 2025-12-01 Epub 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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