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Factors related to the decline and rebuilding of billfish stocks in the Atlantic and Indian oceans

机译:与大西洋和印度洋上比目鱼种群减少和重建有关的因素

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The article examines factors related to the decline and rebuilding of billfish stocks in the Atlantic and Indian oceans. Longline effort has declined over the last 10-15 years in both oceans. This decline in fishing pressure has led to the recovery of some stocks, but some species that are caught incidentally in industrial longline fisheries remain overexploited. Using a simple moving average technique on fishing mortality trajectories, we estimated a threshold effort size of 240 million hooks for the Atlantic Ocean and 364 million hooks for the Indian Ocean where stocks start experiencing overfishing. In addition, we highlight differences in the economic characteristics of the major fleets catching billfish in the two oceans and discuss how this may be associated with differences in management, enforcement, and stock rebuilding.
机译:本文研究了与大西洋和印度洋上的比目鱼种群减少和重建有关的因素。在过去的10-15年中,两洋的延绳钓工作有所减少。捕捞压力的下降导致一些种群的恢复,但是在工业延绳钓渔业中偶然捕获的一些物种仍被过度开发。使用简单的移动平均技术分析捕鱼死亡率轨迹,我们估计大西洋的阈值工作量为2.4亿钩,印度洋的阈值努力量为3.64亿钩,开始出现过度捕捞。此外,我们重点介绍了在两个海洋中捕捞比目鱼的主要船队的经济特征的差异,并讨论了这可能与管理,执法和种群重建的差异有关。

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