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

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 mes...

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Autores principales:	Bingzhong Yang, Bent Herrmann, Lei Yan, Jie Li, Teng Wang
Formato:	article
Lenguaje:	EN
Publicado:	PeerJ Inc. 2021
Materias:	Size selectivity Exploitation pattern Diamond mesh codend Southern velvet shrimp Metapenaeopsis palmensis South China Sea Medicine R
Acceso en línea:	https://doaj.org/article/e562690e862c48a28064c328e935fe9e
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spelling	oai:doaj.org-article:e562690e862c48a28064c328e935fe9e2021-11-04T15:05:33ZComparing size selectivity and exploitation pattern of diamond-mesh codends for Southern velvet shrimp (Metapenaeopsis palmensis) in shrimp trawl fishery of the South China Sea10.7717/peerj.124362167-8359https://doaj.org/article/e562690e862c48a28064c328e935fe9e2021-11-01T00:00:00Zhttps://peerj.com/articles/12436.pdfhttps://peerj.com/articles/12436/https://doaj.org/toc/2167-8359In 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.Bingzhong YangBent HerrmannLei YanJie LiTeng WangPeerJ Inc.articleSize selectivityExploitation patternDiamond mesh codendSouthern velvet shrimpMetapenaeopsis palmensisSouth China SeaMedicineRENPeerJ, Vol 9, p e12436 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Size selectivity Exploitation pattern Diamond mesh codend Southern velvet shrimp Metapenaeopsis palmensis South China Sea Medicine R
spellingShingle	Size selectivity Exploitation pattern Diamond mesh codend Southern velvet shrimp Metapenaeopsis palmensis South China Sea Medicine R Bingzhong Yang Bent Herrmann Lei Yan Jie Li Teng Wang 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
description	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.
format	article
author	Bingzhong Yang Bent Herrmann Lei Yan Jie Li Teng Wang
author_facet	Bingzhong Yang Bent Herrmann Lei Yan Jie Li Teng Wang
author_sort	Bingzhong Yang
title	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
title_short	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
title_full	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
title_fullStr	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
title_full_unstemmed	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
title_sort	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
publisher	PeerJ Inc.
publishDate	2021
url	https://doaj.org/article/e562690e862c48a28064c328e935fe9e
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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

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