东海区拖网网囊网目选择性研究  

Study on selectivity of mesh size of cod-end of trawl in the East China Sea region

作　　者：黄洪亮[1] 王明彦[1] 徐宝生[1] 张勋[1] 汤振明[1] 

机构地区：[1]中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室,上海200090

出　　处：《水产学报》2005年第2期232-237,共6页Journal of Fisheries of China

基　　金：农业部"东海;黄海区拖网网囊最小网目尺寸"国家标准修订项目

摘　　要：通过东海区拖网网囊网目对带鱼和小黄鱼的选择性试验,对拖网最适网囊网目尺寸进行了分析研究。结果表明:1.网囊网目45 mm,小黄鱼和带鱼的逃逸率均较低,渔获中兼捕大量当年生经济幼鱼;2.网囊网目54 mm,小黄鱼的50%选择体长尚小于其优势体长组范围,带鱼的50%选择体长已部分进入其优势体长组范围;3.网囊网目65mm,选择体长范围与选择鱼种的优势体长组范围基本一致。综合分析认为:目前东海区最理想的拖网网囊网目不小于60 mm。A field investigation was conducted from 1 April to 30 October 2001 in the East China Sea. The investigation adopted double bottom trawl, the net biggest mesh size is 4 m, the net stretched circumference of opening mouth is 400 m, and the net all length is 156.4m.The experimental methods adopted covered cod-end. This study analyzed the optimized mesh size of cod-end of trawl in the East China Sea region based on the experiment for the selectivity of cod-end mesh size of trawl used mainly for fishing T. haumela and P.ployactis. The results are as follows.1. Escape rate of 45 mm mesh size of cod-end on P. ployactis and T. haumela is lower and by-catch of the commercial juveniles of the same year is large number of the catch. 2. For 54 mm mesh size of cod-end, 50% selected body length of P. ployactis is less than the dominant body length group and the 50% selected body length of T. haumela enteredits dominant body length range. 3. For 65 mm mesh size of cod-end, the selected body length is basically consistent with the dominant body length. It is considered that the optimum mesh size of cod-end of trawl in the East China Sea region should be larger than 60 mm based on the comprehensive analysis.

关 键 词：网囊网目 选择性 拖网 东海 

分 类 号：S972.13[农业科学—捕捞与储运]