Stock assessment of Nile tilapia Oreochromis niloticus (Linnaeus 1758) in Lake Tana, Ethiopia

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
A. Degsera, M. Minwyelet, T. Yosef
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引用次数: 1

Abstract

Nile tilapia Oreochromis niloticus is a commercially important fish species in the Lake Tana fishery and contributes to 65% of the total annual catch. This study estimated the maximum sustainable yield (MSY) and effort at maximum sustainable yield (fMSY) for the O. niloticus fishery using the Thompson and Bell yield prediction model. Catch and effort data from four representative landing sites were collected daily from June 2016 to May 2017 and used to estimate the total mortality coefficient (Z) using catch curve analysis, natural mortality (M) using Pauly’s empirical formula, and fishing mortality (F) as F = Z − M. Population abundance was evaluated using the Jones length-based cohort analysis model. The estimated Z, M and F values were 1.1, 0.52, and 0.49 per year, respectively. In total, 5 077 tons of O. niloticus were produced, which exceeds the MSY of 4 904 tons per year that could be obtained from the fishery at an F0.1. Consequently, the recommendation is to reduce the fishing effort by 15%. Collection of catch-and- effort data from more landing sites, over an extended period, could improve the yield estimates and this should be considered in conjunction with a bioeconomic analysis in future.
埃塞俄比亚塔纳湖尼罗罗非鱼种群评估
尼罗罗非鱼是塔纳湖渔业中一种重要的商业鱼类,占年总捕获量的65%。本研究使用Thompson和Bell产量预测模型估计了尼罗罗非鱼渔业的最大可持续产量(MSY)和最大可持续产量的努力(fMSY)。从2016年6月到2017年5月,每天收集四个有代表性的着陆点的渔获量和努力数据,并使用渔获量曲线分析估计总死亡率(Z),使用Pauly经验公式估计自然死亡率(M),使用F=Z−M估计捕鱼死亡率(F)。使用基于Jones长度的队列分析模型评估种群丰度。估计的Z、M和F值分别为每年1.1、0.52和0.49。总产量为5077吨尼罗罗非鱼,超过了渔业在F0.1时每年可获得的4904吨的MSY。因此,建议将捕鱼量减少15%。在较长的时间内,从更多的着陆点收集渔获量和努力量数据,可以提高产量估计,这应该与未来的生物经济分析结合起来考虑。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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