Selectivity of <em>Parimichthys polyactis</em> of bottom trawl in the East China Sea

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Selectivity of Parimichthys polyactis of bottom trawl in the East China Sea
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Affiliation:School of Marine Science,Shanghai Ocean University,Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and Utilization,Ministry of Agriculture,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences;Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and Utilization,Ministry of Agriculture,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and Utilization,Ministry of Agriculture,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and Utilization,Ministry of Agriculture,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,School of Marine Science,Shanghai Ocean University,Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and Utilization,Ministry of Agriculture,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences;Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and Utilization,Ministry of Agriculture,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences
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Abstract:

A bottom trawl investigation was conducted for selective test of Parimichthys polyactis by using diamond mesh codend 50, 55, 60, 65, 70, 75 and 80mm in the East China Sea in August 2014. By using cover-net method, the catching data were analyzed and selective parameters were estimated by using the logistic equation with the maximum likelihood method. The results show that: (1)when the mesh sizes were 50mm and 55mm, a large number of the commercial juveniles of the same year are caught; (2) According to the Logistic curve, Parimichthys polyactis average body length and weight increased gradually with the mesh size became larger; (3)The longer the trawl towed, the more obvious blocking effect, which contributed to a serious impact on non-target fish escape rate; (4)Based on the relation 50% retention length with mesh sizes of codend, the linear regression equation of the Parimichthys polyactis is L_0.5=2.625M-30.7(R²=0.915). Based on the previous research and the existing catch standard, together with fishery production, the appropriate trawl mesh size is 60mm or bigger.

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宋学锋,陈雪忠,黄洪亮,唐峰华,王德虎,屈泰春.东海区底拖网对小黄鱼的选择性研究[J].上海海洋大学学报,2015,24(3):449-456.
SONG Xuefeng, CHEN Xuezhong, HUANG Hongliang, TANG Fenghua, WANG Dehu, QU Taichun. Selectivity of Parimichthys polyactis of bottom trawl in the East China Sea[J]. Journal of Shanghai Ocean University,2015,24(3):449-456.

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Received:December 16,2014
Revised:March 13,2015
Adopted:March 19,2015
Online: May 25,2015
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