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首页> 外文期刊>ICES Journal of Marine Science >Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery
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Assessment of a juvenile and trash excluder device in a Vietnamese shrimp trawl fishery

机译：评估越南虾拖网渔业中的少年和垃圾排除器

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In this study, we (ⅰ) identified why Vietnamese shrimp fishers land juvenile fish illegally; (ⅱ) identified groups of fishers that would use a bycatch reduction device (BRD) to exclude these fish; (ⅲ) studied the hydrodynamic performance of a juvenile and trash excluder device (JTED) in a flume tank; and (ⅳ) assessed the performance of this device under commercial fishing conditions. Based on the responses of 65 fishers to a questionnaire, we found that juvenile fish are now an important economic component of the total catch, and that fishers operating larger boats were more willing to use a JTED to exclude these fish than fishers operating smaller boats. The hydrodynamic study of a JTED identified the location of low-velocity regions around the device and codend, and this information can be used to identify the location of a secondary BRD to allow more fish to escape. The at-sea assessment of this device found that 73% of juvenile fish, 16% of valuable fish, and 8% of shrimp were excluded by the JTED, although most valuable fish and shrimp were smaller than the minimum legal landing size. Overall, this loss represents a 9% reduction in revenue. Yield-per-recruit analysis indicated that this could be offset by not catching fish less than the minimum legal landing size.
机译：在这项研究中，我们（ⅰ）查明了为什么越南虾渔民非法捕捞幼鱼；为什么？ （ⅱ）确定将使用减少兼捕的装置来排除这些鱼的渔民群体； （ⅲ）研究了水槽水箱中的少年排污装置（JTED）的水动力性能； （ⅳ）评估了该设备在商业捕鱼条件下的性能。根据65位渔民对问卷的答复，我们发现，幼鱼现在已成为总捕捞量的重要经济组成部分，与经营较小渔船的渔民相比，经营较大渔船的渔民更愿意使用JTED排除这些鱼。 JTED的水动力研究确定了设备和编码区周围的低速区域的位置，该信息可用于识别次要BRD的位置，以使更多的鱼类逃逸。该设备的海上评估发现，JTED排除了73％的幼鱼，16％的珍贵鱼和8％的虾，尽管大多数珍贵的鱼和虾都小于法定最小登陆面积。总体而言，这种损失意味着收入减少了9％。每招募收益分析表明，可以通过不捕捞小于最小合法登陆量的鱼来抵消这一损失。

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