Global tuna fisheries are valued at more than $40 billion, with the majority of this value derived from purse seine fisheries. Recently created large-scale marine protected areas are potentially big enough to protect highly migratory species such as tuna, possibly leading to increases in abundance (a conservation benefit) and consequent spillover near protected area boundaries (an economic benefit). Using publicly available data from nine large-scale marine protected areas across the Pacific and Indian oceans, we find that catch-per-unit-effort in tuna purse seine fisheries has increased by an average of 12 to 18% near protected area boundaries, and this increase declines with distance from the boundaries. The increase is larger for bigeye tuna ( Thunnus obesus ) than for skipjack tuna ( Katsuwonus pelamis ), in line with fisheries science simulation models.

中文翻译：

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有证据表明，大规模海洋保护区对围网渔业的溢出效益


全球金枪鱼渔业价值超过 400 亿美元，其中大部分价值来自围网渔业。最近建立的大规模海洋保护区可能足够大，可以保护金枪鱼等高度洄游物种，可能导致丰度增加（一种保护效益）和随之而来的保护区边界附近的溢出（一种经济效益）。使用来自太平洋和印度洋 9 个大型海洋保护区的公开数据，我们发现金枪鱼围网渔业的单位捕捞量在保护区边界附近平均增加了 12% 到 18%，并且这种增加随着距离边界的距离而下降。大眼金枪鱼 （Thunnus obesus） 的增加幅度大于鲣鱼 （Katsuwonus pelamis），这与渔业科学模拟模型一致。