Study on the selectivity of codend mesh of stow net for Coilia mystus in Huangmaohai Estuary

doi:10.12024/jsou.20170902145

Home > Archive>Volume 27, Issue 2, 2018 >274-283. DOI:10.12024/jsou.20170902145

Study on the selectivity of codend mesh of stow net for Coilia mystus in Huangmaohai Estuary
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                        10.12024/jsou.20170902145
                    
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Affiliation:South China Sea Fisheries Research Institute,Chinese Academy Fishery Sciences,Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture,Key Lab. of South China Sea Fishery Resources Exploitation Utilization,Ministry of Agriculture,South China Sea Fisheries Research Institute,Chinese Academy Fishery Sciences,Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture,Key Lab. of South China Sea Fishery Resources Exploitation Utilization,Ministry of Agriculture,South China Sea Fisheries Research Institute,Chinese Academy Fishery Sciences,Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture,Key Lab. of South China Sea Fishery Resources Exploitation Utilization,Ministry of Agriculture,South China Sea Fisheries Research Institute,Chinese Academy Fishery Sciences,Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture,Key Lab. of South China Sea Fishery Resources Exploitation Utilization,Ministry of Agriculture,South China Sea Fisheries Research Institute,Chinese Academy Fishery Sciences,Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture,Key Lab. of South China Sea Fishery Resources Exploitation Utilization,Ministry of Agriculture,South China Sea Fisheries Research Institute,Chinese Academy Fishery Sciences,Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture,Key Lab. of South China Sea Fishery Resources Exploitation Utilization,Ministry of Agriculture
Clc Number:S932.4；S973.4
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Abstract:

In order to determine the suitability of the minimum mesh size of stow net in the South China Sea, the selectivity of codend mesh of double stake net was studied by using covered net method in Huangmaohai Estuary in April and August of 2015. Coilia mystus is the main fishing target in the area by the index of relative importance(IRI). Using the catch data of the fishing target, different mesh sizes selectivity curves of them have been drawn by using Logistic curves as a selectivity model. Parameters of selectivity are estimated according to the maximum likelihood method. The results of the experiments indicate that when the mesh size is 25 mm and 35 mm in spring, its L_0.5 is 107.84 mm and 114.61 mm, respectively; when the mesh size is 25 mm, 30 mm and 35 mm in summer, its L_0.5 is 77.35 mm, 88.87 mm and 99.91 mm, respectively. With the increase of the mesh size of stow net, the L_0.5 and SR of Coilia mystus increase. The L_0.5 of Coilia mystus is different with the same mesh size between spring and summer, while the minimum mesh size calculated according to the relationship between L_0.5 and mesh size remains basically the same in all seasons, which is 42.95 mm and 43.87 mm respectively. Based on the results,we conclude that the minimum mesh size of 35 mm cannot meet the demand of fishery resources protection in Huangmaohai Estuary.

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晏磊,杨吝,谭永光,杨炳忠,张鹏,李杰.黄茅海河口张网网囊网目对凤鲚的选择性研究[J].上海海洋大学学报,2018,27(2):274-283.
YAN Lei, YANG Lin, TAN Yongguang, YANG Bingzhong, ZHANG Peng, LI Jie. Study on the selectivity of codend mesh of stow net for Coilia mystus in Huangmaohai Estuary[J]. Journal of Shanghai Ocean University,2018,27(2):274-283.

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Received:September 29,2017
Revised:December 12,2017
Adopted:December 20,2017
Online: April 11,2018
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