摘要
为研究黄海双船变水层拖网网囊的网目选择性,2015年10月在黄海南部进行了网囊网目为40、54、60mm和70mm的套网拖网试验,采用Logistic选择模型和体周估算法对网囊网目选择性进行研究。结果表明,黄海双船变水层拖网渔获主要为蓝点马鲛、银鲳、带鱼、小黄鱼和鳀鱼;随着网囊网目尺寸的增大,逃逸率明显增加;极大似然法估算的模型参数,用AIC值检验拟合良好;估算出以变水层拖网捕捞达到可捕标准的部分经济鱼类相应的网囊网目尺寸,分别为小黄鱼71.0 mm、银鲳103.6mm、带鱼92.3mm、蓝圆鲹63.8mm。在黄海目前的渔业资源现状下,为保护小黄鱼、带鱼和鲐鲹等中小型经济鱼类的渔业资源,建议将双船变水层拖网的最小网囊网目尺寸定为60mm。
In order to study the selectivity of mesh size of cod-end of double ships＇pelagic trawl in the Yellow Sea,four cod-end meshes of 40 mm,54mm,60 mm and 70 mm were tested in October 2015.The selectivity of the cod-end mesh of trawl was studied using Logistic selection model and body circumference estimation method.Results showed that the catches of pelagic trawl were mainly composed of Scomberomorus niphonius,Pampus argenteus,Trichiurus haumela,Pseudosciaena polyactis and Engraulis japonicus;the escape rate was increased significantly with the increase of cod-end mesh size;AIC was relatively small,and Logistic model obtained the goodness-of-fit with the maximum likelihood method;the minimum mesh sizes of cod-end allowed for some important commercial fishes in the Yellow Sea were estimated based on their catchable sizes,which were 71.0mm for P.polyactis,103.6mm for P.argenteus,92.3mm for T.haumelaand 63.8mm for Decapterus maruadsi.It is advised that the minimum mesh size of cod-end of double ships＇pelagic trawl be 60 mm in order to protect the stock population of small and medium size fishes,such as P.polyactis,T.haumelaand D.maraudsi,under the presentsituation of fishery resources in the Yellow Sea.
出处
《水产科学》
CAS
CSCD
北大核心
2017年第4期436-442,共7页
Fisheries Science
基金
公益性行业(农业)科研专项(201203018)
农业部财政专项(2130110)
关键词
小黄鱼
逃逸率
最小网目
变水层拖网
极大似然法
Pseudosciaena polyactis
escape rate
minimum mesh size
maximum likelihood method
