Comparing size selectivity and exploitation pattern of diamond-mesh codends for Southern velvet shrimp (Metapenaeopsis palmensis) in shrimp trawl fishery of the South China Sea

文献类型： 外文期刊

第一作者： Yang, Bingzhong

作者： Yang, Bingzhong;Yan, Lei;Li, Jie;Wang, Teng;Yang, Bingzhong;Yan, Lei;Li, Jie;Wang, Teng;Herrmann, Bent;Herrmann, Bent;Herrmann, Bent

作者机构：

关键词： Size selectivity; Exploitation pattern; Diamond mesh codend; Southern velvet shrimp; Metapenaeopsis palmensis; South China Sea; Trawl; Mesh size; Fisheries management; Shrimp species

期刊名称：PEERJ COMPUTER SCIENCE （ 影响因子：1.392； 五年影响因子：3.897 ）

ISSN：

年卷期： 2021 年 9 卷

页码：

收录情况： SCI

摘要： In this study, size selectivity and exploitation pattern of six diamond-mesh codends with different mesh sizes, ranging from 25 to 54 mm, for Southern velvet shrimp (Metapenaeopsis palmensis) were tested and compared in a shrimp trawl fishery of the South China Sea (SCS). We used a codend with a mesh size of 25 mm (D25) as a starting point, which is the minimum mesh size (MMS) currently regulated in the studied area. Four different fishing population scenarios were applied to quantify and compare how mesh sizes of codends used would impact the size selectivity and exploitation pattern for the target shrimp species. The results demonstrated that the D25 codend was not proper for protecting juvenile shrimp at the studied area. By applying this legal codend, L50 (50% retention length) of the target shrimp species was below its minimum conservation reference size (MCRS, 7.0 cm total length), the retention probability of shrimp with a length of MCRS was above 95% CI [91-99] and more than 43% of undersized shrimp was retained. To mitigate the bycatch issue of undersized shrimp, increasing the mesh size in the diamond mesh codend is a simple and effective option. However, the loss of catch efficiency for marketable shrimp is a major concern while increasing the mesh size. A good compromise between releasing undersized shrimp and maintaining the legal individuals is manifested by using the codend with 35 mm mesh size (D35). Our study will be beneficial for the management of shrimp trawl fisheries in the SCS.

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