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首页> 外文期刊>ICES Journal of Marine Science >Massive increase in the use of drifting Fish Aggregating Devices (dFADs) by tropical tuna purse seine fisheries in the Atlantic and Indian oceans
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Massive increase in the use of drifting Fish Aggregating Devices (dFADs) by tropical tuna purse seine fisheries in the Atlantic and Indian oceans

机译：大西洋和印度洋的热带金枪鱼围网捕捞业大量增加使用漂流鱼聚集装置（dFAD）

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Since the mid-1990s, drifting Fish Aggregating Devices (dFADs), artificial floating objects designed to aggregate fish, have become an important mean by which purse seine fleets catch tropical tunas. Mass deployment of dFADs, as well as the massive use of GPS buoys to track dFADs and natural floating objects, has raised serious concerns for the state of tropical tuna stocks and ecosystem functioning. Here, we combine tracks from a large proportion of the French GPS buoys from the Indian and Atlantic oceans with data from observers aboard French and Spanish purse seiners and French logbook data to estimate the total number of dFADs and GPS buoys used within the main fishing grounds of these two oceans over the period 2007-2013. In the Atlantic Ocean, the total number of dFADs increased from 1175 dFADs active in January 2007 to 8575 dFADs in August 2013. In the Indian Ocean, this number increased from 2250 dFADs in October 2007 to 10 300 dFADs in September 2013. In both oceans, at least a fourfold increase in the number of dFADs was observed over the 7-year study period. Though the relative proportion of natural to artificial floating objects varied over space, with some areas such as the Mozambique Channel and areas adjacent to the mouths of the Niger and Congo rivers being characterized by a relatively high percentage of natural objects, in no region do dFADs represent <50% of the floating objects and the proportion of natural objects has dropped over time as dFAD deployments have increased. Globally, this increased dFAD use represents a major change to the pelagic ecosystem that needs to be closely followed in order to assess its impacts and avoid negative ecosystem consequences.
机译：自1990年代中期以来，漂流鱼类聚集装置（dFAD），旨在聚集鱼类的人工漂浮物已成为围网捕捞围网捕捞金枪鱼的重要手段。 dFAD的大规模部署，以及GPS浮标的大量使用来跟踪dFAD和天然漂浮物，引起了人们对热带金枪鱼种群状况和生态系统功能的严重关注。在这里，我们将来自印度洋和大西洋的法国GPS浮标的大部分与法国和西班牙围网渔船的观察员的数据以及法国航海日志数据相结合，以估算主要渔场中使用的dFAD和GPS浮标的总数在2007年至2013年期间，这两个海洋中的两个。在大西洋，dFAD的总数从2007年1月的1175 dFAD增加到2013年8月的8575 dFAD。在印度洋，这一数字从2007年10月的2250 dFAD增加到2013年9月的10300 dFAD。 ，在7年的研究期内，观察到的dFAD数量至少增加了四倍。尽管自然漂浮物与人工漂浮物的相对比例随空间变化，但莫桑比克海峡和尼日尔河与刚果河口附近的某些地区的自然物百分比较高，但在任何地区都没有dFADs随着dFAD部署的增加，代表的漂浮物不到50％，自然物体的比例随时间下降。在全球范围内，dFAD使用量的增加代表了远洋生态系统的重大变化，需要对其进行密切关注，以评估其影响并避免对生态系统造成负面影响。

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