Population Dynamics of Yellowfin Tuna Thunnus albacares (Bonnaterre, 1788) in the Fisheries Management Area 573 of the Indian Ocean

Q3 Environmental Science

Ribarstvo, Croatian Journal of Fisheries Pub Date : 2021-05-26 DOI:10.2478/cjf-2021-0006

A. Ghofar, S. Saputra, A. Sabdono, Anhar Solichin, W. T. Taufani, S. Febrianto

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引用次数: 3

Abstract

Abstract Yellowfin tuna Thunnus albacares is one of the major species of tuna caught in the Fisheries Management Area (FMA) 573 of the Indian Ocean. Its production contributed to 35.83% of the total production of tuna in 2013. The study was conducted to assess the population dynamics of this species in FMA 573, based on length-frequency data collected in 2013-2017, and was analysed using FiSAT II software. The results obtained show length-weight relationship of W = 0.000052 FL2.78, negative allometric growth and growth equation of Lt = 194.25 (1-e-0.51 (t + 0.1889)). The length at first capture was estimated at 140 cm FL. Recruitment season occurs between July and September, with a peak in August. The rate of total mortality (Z) was 2.32 yr-1, including natural mortality rate (M) of 0.69 yr-1 and fishing mortality rate (F) of 1.63 yr-1. The exploitation rates of yellowfin tuna were estimated to be 0.70, indicating that it has exceeded the optimum exploitation rate (E = 0.5) and that overexploitation had occurred. There is an obvious need for consistent monitoring and surveillance of fishing fleet, type and size of fishing gear, as well as the fish size and quantity of the catch.

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印度洋渔业管理区573黄鳍金枪鱼种群动态(Bonnaterre, 1788)

摘要黄鳍金枪鱼是在印度洋573渔业管理区捕捞的主要金枪鱼之一。2013年，其产量占金枪鱼总产量的35.83%。该研究基于2013-2017年收集的长度频率数据，评估了FMA 573中该物种的种群动态，并使用FiSAT II软件进行了分析。结果表明，长重关系为W＝0.000052 FL2.78，负异速生长和生长方程为Lt＝194.25（1-e-0.51（t+0.1889））。首次捕获时的长度估计为140 cm FL。招募季节发生在7月至9月，8月达到高峰。总死亡率（Z）为2.32 yr-1，其中自然死亡率（M）为0.69 yr-1，捕鱼死亡率（F）为1.63 yr-1。黄鳍金枪鱼的开采率估计为0.70，这表明它已经超过了最佳开采率（E=0.5），而且已经出现了过度开采。显然需要对渔船队、渔具的类型和大小以及渔获物的大小和数量进行一致的监测和监测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ribarstvo, Croatian Journal of Fisheries Environmental Science-Ecology

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

10 weeks

期刊介绍： The Croatian Journal of Fisheries was established in 1938 and today possesses a long-term tradition of publishing papers that deal with both freshwater and marine fisheries. Areas covered by the Journal include ichthyology, aquaculture, ecology and diseases of fish and other aquatic organisms, problems of open waters and other topics related to the fisheries field. Prior to publication, articles pass through rigorous review by senior scientists from around the world. The Journal features articles that reflect original research, interpretative content and subject matter of interest to the fisheries profession.