Gillnet Selectivity on the Small Yellow Croaker Larimichthys polyactis in the Southern Yellow Sea

文献类型： 外文期刊

第一作者： Xiong, Ying

作者： Xiong, Ying;Jian, Yang;Xiong, Ying;Zhong, Xiaming;Tang, Jianhua;Jian, Yang;Li, Lingzhi

作者机构：

关键词： Larimichthys polyactis;gillnet;selectivity;age structure;sex ratio;southern yellow sea

期刊名称：TURKISH JOURNAL OF FISHERIES AND AQUATIC SCIENCES （ 影响因子：1.264； 五年影响因子：1.268 ）

ISSN： 1303-2712

年卷期： 2017 年 17 卷 6 期

页码：

收录情况： SCI

摘要： Gillnet selectivity on the small yellow croaker, Larimichthys polyactis, was investigated in the southern Yellow Sea. Ten gillnet series were tested: two net heights (6 and 10 m) and five mesh sizes (35, 40, 45, 50, and 55 mm). The age 0+ and 1+ groups dominated the catch with proportions of 43% and 53%, respectively. The sex ratio was found to be size- and age-dependent in gillnet surveys, with males increasingly dominant in the smaller size and younger age classes. Nets with heights of 10 m caught selectively more age 0+ individuals and males than 6 m height nets. Gillnet selectivity estimates derived from girth frequency distribution were represented by a binormal model, and the optimal mesh size for 50% retention for the proposed minimum landing size (body length 148.3 mm) of L. polyactis was estimated as 45 mm. We suggest that a gillnet with a mesh size of 45 mm and net height of 6 m is optimal for exploiting L. polyactis as it is less selective for juveniles and smaller males.

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