Evaluating the impact of tuna purse-seine fishing under fish aggregating devices and free schools on Little Tunny in the Northeast Atlantic Ocean: Implications using length-based methods

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries Pub Date : 2024-12-31 DOI:10.1002/mcf2.10314

Komba Jossie Konoyima, Jiangfeng Zhu, Richard Kindong

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引用次数: 0

Abstract

Objective

Little Tunny Euthynnus alletteratus is a commercially viable species, and its research has been prioritized by the International Commission for the Conservation of Atlantic Tunas. This study aimed to evaluate the stock status of Little Tunny in the Northeast Atlantic Ocean, the effectiveness of the life history priors, and the sensitivity of the model's predicted reference points to prior misspecification. The findings could help reduce uncertainties regarding the state of Little Tunny in the region.

Methods

We used empirically estimated life history parameters and purse-seine fish aggregating device (FAD) and free school fishing length-frequency data from 2000 to 2021, available in the International Commission for the Conservation of Atlantic Tunas database. We applied the length-based Bayesian biomass (LBB) and length-based spawning potential ratio assessment methods.

Result

The LBB's outputs indicate that Little Tunny was grossly overfished at the exerted fishing pressure. This was corroborated by length-based spawning potential ratio estimates of low spawning per recruit for the stock exploited by purse seines under FAD and free school sets. The reference points of both models were most sensitive to asymptotic length (L_∞) prior misspecification, and including life history priors in LBB produced a narrower confidence interval of the estimated reference points.

Conclusion

The Northeast Atlantic Ocean Little Tunny fishery exploited by purse-seine fisheries under FAD and free school sets may be unsustainable. We maintain that user priors could reduce uncertainty in LBB, whereas accurate specification of priors, particularly L_∞, is required to have less biased results using the models. We recommend catch limits through, for instance, spatial closures, but caution is advised due to uncertainty in this study's life history priors.

Abstract Image

查看原文本刊更多论文

评估在鱼群聚集装置和自由鱼群下的金枪鱼围网捕鱼对东北大西洋小金枪鱼的影响：使用基于长度的方法的影响

目的小金枪鱼（Euthynnus alletteratus）是一种具有商业价值的鱼类，其研究已被国际大西洋金枪鱼保护委员会列为重点研究对象。本研究旨在评估东北大西洋小金枪鱼的种群状况、生活史先验的有效性以及模型预测参考点对先验错误的敏感性。这些发现可以帮助减少该地区小金枪鱼状态的不确定性。方法利用国际大西洋金枪鱼保护委员会（International Commission for Conservation of Atlantic tuna）数据库2000 - 2021年的生活史参数、围网鱼群聚集装置（FAD）和自由鱼群捕捞长度-频率数据进行实证估算。我们应用了基于长度的贝叶斯生物量（LBB）和基于长度的产卵势比评估方法。结果LBB的输出表明，在施加的捕捞压力下，小金枪鱼被严重过度捕捞。这一点得到了基于长度的产卵潜力比估计的证实，即在FAD和免费鱼群条件下，围网捕捞的鱼群每名新成员的产卵量较低。两种模型的参考点对渐近长度（L∞）先验错误最敏感，并且在LBB中包含生活史先验使估计的参考点的置信区间更窄。结论在FAD和自由学校环境下采用围网捕捞的东北大西洋小金枪鱼渔业是不可持续的。我们认为，用户先验可以减少LBB中的不确定性，而精确的先验规范，特别是L∞，需要使用模型得到较少的偏差结果。我们建议通过空间封闭等方式限制捕鱼量，但由于本研究之前生活史的不确定性，建议谨慎行事。

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来源期刊

Marine and Coastal Fisheries FISHERIES-MARINE & FRESHWATER BIOLOGY

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

>12 weeks

期刊介绍： Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science publishes original and innovative research that synthesizes information on biological organization across spatial and temporal scales to promote ecologically sound fisheries science and management. This open-access, online journal published by the American Fisheries Society provides an international venue for studies of marine, coastal, and estuarine fisheries, with emphasis on species'' performance and responses to perturbations in their environment, and promotes the development of ecosystem-based fisheries science and management.