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.
出处
《水产学报》
CAS
CSCD
北大核心
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
关键词
网囊网目
选择性
拖网
东海
mesh of cod-end
selectivity
trawl
the East China Sea
