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Limited potential to recover from overfishing raises concerns for deep-sea sharks, rays and chimaeras

机译：从过度捕捞中恢复的潜力有限，引起人们对深海鲨鱼，rays鱼和美洲纲的担忧

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摘要

As global fishing effort increasingly expands into deeper water, concerns exist over the ability of deep-sea fishes to sustain fisheries. There is however little quantitative evidence to support these concerns for the deep-sea cartilaginous fishes (Chondrichthyes: sharks, rays and chimaeras). This paper compiled available life history data for this group to analyse their ability to rebound from population declines relative to continental shelf and pelagic species. Deep-sea cartilaginous fishes have rates of population increase that are on average less than half those of shelf and pelagic species, and include the lowest levels observed to date. Population doubling times indicate that once a stock has been depleted, it will take decades, and potentially centuries, before it will recover. Furthermore, population recovery rates decrease with increasing depth, suggesting species that occur deepest are those most vulnerable to fishing. These results provide the first assessment of the productivity of deep-sea chondrichthyans, highlighting that precautionary management of developing deep-sea fisheries is essential if stocks and biodiversity are to be maintained.
机译：随着全球捕捞努力越来越多地扩展到更深的水域，人们对深海鱼类维持渔业的能力存在担忧。然而，几乎没有定量证据支持对深海软骨鱼类（Chondrichthyes：鲨鱼，rays鱼和chi鱼）的这些担忧。本文汇编了该群体的可用生活史数据，以分析其相对于大陆架和浮游物种从种群下降中反弹的能力。深海软骨鱼类的种群增加率平均不到架子和浮游鱼类的一半，并且包括迄今为止观察到的最低水平。人口增加一倍的时间表明，一旦种群耗尽，它将需要数十年甚至数个世纪的时间才能恢复。此外，种群恢复率随深度的增加而降低，这表明最深的物种是最容易捕捞的物种。这些结果提供了对深海软骨鱼类生产力的首次评估，突显了如果要维持种群和生物多样性，就必须对发展深海渔业进行预防性管理。

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