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.

中文翻译：

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FAD捕鱼是经济陷阱吗？季节性关闭和其他管理措施对围网金枪鱼船队的影响

集鱼装置（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。通过多个计量经济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渔获量和利润的影响：(1) 每艘船的授权浮标数量减少一半，(2) FAD 捕鱼关闭 72 天，并且 (3) 不重新分配免费学校的工作量。结果显示，机队利润分别大幅下降7%、10%和18%。我们假设 FAD 捕捞的“经济陷阱”是由于这种捕捞技术对寻求规模经济的大型船只的效率要高得多，以及黄鳍金枪鱼（Thunnus albacares）和大眼金枪鱼（Thunnus obesus）的过度捕捞状况和捕捞限制造成的。在印度洋。将结果与其他研究 FAD 管理措施对其他海洋影响的研究进行了比较。