Is FAD fishing an economic trap? Effects of seasonal closures and other management measures on a purse-seine tuna fleet

IF 5.6 1区农林科学 Q1 FISHERIES

Fish and Fisheries Pub Date : 2023-10-25 DOI:10.1111/faf.12799

P. Guillotreau, F. Salladarré, M. Capello, A. Dupaix, L. Floc'h, A. Tidd, M. Tolotti, L. Dagorn

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引用次数: 0

Abstract

The management of fish aggregating devices (FAD) creates heated debates in tuna fishery management organizations striving to reduce the number of deployed floating objects. Through several econometric models and a machine learning approach, we evaluate the consequences of three management scenarios on the catch and profit of the French purse-seine fleet operating in the Indian Ocean: (1) a half reduction in the number of authorized buoys per vessel, (2) a 72-day closure of FAD fishing with and (3) without re-allocation of effort on free schools. The results show a significant decrease of fleet profits by 7%, 10% and 18% respectively. We hypothesize an “economic trap” of FAD fishing caused by the far greater efficiency of this harvesting technique for larger vessels searching for economies of scale, and by the overfished status and catch limitation of yellowfin (Thunnus albacares) and bigeye (Thunnus obesus) tunas in the Indian Ocean. The results are compared with other studies looking at the impact of FAD management measures in other oceans.

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FAD捕鱼是一个经济陷阱吗？季节性关闭和其他管理措施对围网金枪鱼船队的影响

鱼类聚集装置（FAD）的管理在金枪鱼渔业管理组织中引起了激烈的争论，这些组织致力于减少部署的漂浮物的数量。通过几个计量经济学模型和机器学习方法，我们评估了三种管理情景对在印度洋作业的法国围网船队的捕捞量和利润的影响：（1）每艘船的授权浮标数量减少一半，（2）72天内关闭FAD捕鱼，（3）不重新分配免费学校的工作。结果显示，车队利润分别大幅下降7%、10%和18%。我们假设FAD捕鱼存在“经济陷阱”，这是由于这种捕捞技术对寻求规模经济的大型船只的效率高得多，以及印度洋黄鳍金枪鱼（Thunnus albacares）和大眼金枪鱼（Thunnes obesus）的过度捕捞状态和捕捞限制造成的。将研究结果与其他研究FAD管理措施对其他海洋的影响进行了比较。

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

Fish and Fisheries 农林科学-渔业

CiteScore

12.80

自引率

6.00%

发文量

期刊介绍： Fish and Fisheries adopts a broad, interdisciplinary approach to the subject of fish biology and fisheries. It draws contributions in the form of major synoptic papers and syntheses or meta-analyses that lay out new approaches, re-examine existing findings, methods or theory, and discuss papers and commentaries from diverse areas. Focal areas include fish palaeontology, molecular biology and ecology, genetics, biochemistry, physiology, ecology, behaviour, evolutionary studies, conservation, assessment, population dynamics, mathematical modelling, ecosystem analysis and the social, economic and policy aspects of fisheries where they are grounded in a scientific approach. A paper in Fish and Fisheries must draw upon all key elements of the existing literature on a topic, normally have a broad geographic and/or taxonomic scope, and provide general points which make it compelling to a wide range of readers whatever their geographical location. So, in short, we aim to publish articles that make syntheses of old or synoptic, long-term or spatially widespread data, introduce or consolidate fresh concepts or theory, or, in the Ghoti section, briefly justify preliminary, new synoptic ideas. Please note that authors of submissions not meeting this mandate will be directed to the appropriate primary literature.