The diversity, distribution and status of deep-water elasmobranchs in the Rockall Trough, north-east Atlantic Ocean.
The diversity, distribution and status of deep-water elasmobranchs in the Rockall Trough, north-east Atlantic Ocean.
复制标题
东北大西洋罗卡尔海槽深水软骨鱼的多样性、分布和现状。
DOI：
10.1111/jfb.12822
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发表时间：
2015
影响因子：
2
通讯作者：
T. Blasdale
中科院分区：
文献类型：
--
作者：
F. Neat;F. Burns;E. Jones;T. Blasdale
对东北大西洋科学深水拖网渔业调查的数据进行了分析，以确定弹目鱼类的空间和水深分布，并评估1998-2013年期间相对丰度的变化。在此期间，深海鲨鱼的商业渔业从完全不受监管，到受到短暂管理，再到完全被禁止。在300米至2030米的深度范围内，共记录到22种鲨鱼和10种溜冰。它们的丰度都表现出强烈的物种特定深度相关的趋势。在较常见的11个物种中，5个物种的相对丰度没有随时间变化，2个物种(Centrophorus squamosus和Centroselachus crepidater)的相对丰度显著下降，4个物种的相对丰度增加(Apristurus kerodes、Apristurus microps、Galeus Melastus和Deania calcea)。假设这些种群在过去被渔业消耗殆尽，目前的数据并没有表明已经出现了整体复苏。最近几年一些物种的积极迹象表明，它们正在迁徙或重新进入该地区；然而，令人关切的是，有两个物种继续减少。继续需要对这些板贝物种进行预防性管理，目前禁止这些物种在欧洲水域上岸仍然是适当的。
Data from a scientific deep-water trawl fisheries survey in the north-east Atlantic were analysed to determine the spatial and bathymetric distribution of elasmobranch species and assess the change in relative abundance over the period 1998-2013. During this period, commercial fisheries for deep-water sharks went from being entirely unregulated, to being briefly managed, to being completely prohibited. A total of 22 species of shark and 10 species of skate were recorded between depths of 300 and 2030 m. All showed strong species-specific depth-related trends in abundance. Out of the 11 more common species, five showed no change in relative abundance over time, two (Centrophorus squamosus and Centroselachus crepidater) declined significantly and four increased in relative abundance (Apristurus aphyodes, Apristurus microps, Galeus melastomus and Deania calcea). Assuming these populations were depleted by fisheries in the past, the current data do not suggest there has been an overall recovery. Positive signs for some species in the most recent years suggest movement or recruitment back into the area; however, it is of concern that two species continued to decline. There is a continued need to have precautionary management of these elasmobranch species, and the current ban on landing these species in European waters remains appropriate.