2020—2021年舟山渔场及邻近海域小黄鱼繁殖力现状

Reproductive Status of Larimichthys polyactis in Zhoushan Fishing Ground and Adjacent Waters from 2020 to 2021

为掌握舟山渔场及周边水域小黄鱼(Larimichthys polyactis)的繁殖特性,文章根据2020年和2021年3—5月在舟山渔场及邻近海域进行的拖网和流刺网渔获样品,分析了小黄鱼繁殖群体特征,及其繁殖力与生长指标的关系,并对繁殖力变化做了比较分析。结果表明:2020—2021年小黄鱼群体体长范围为107~200 mm,优势体长组为130~170 mm,平均体长143.98±16.78 mm;体重范围为18.4~108.3 g,优势体重组为30~70 g,平均体重46.78±16.54 g;绝对繁殖力7 944~31 077粒,平均15 545±6 019粒;体长相对繁殖力范围为53~182粒/mm,平均为98±31.29粒/mm;体重相对繁殖力范围为126~433粒/g,平均为258±60.91粒/g;卵径范围为0.41~2.77 mm,平均为1.01±0.36 mm。研究表明,绝对繁殖力与体长呈幂函数相关,与体重和纯重呈线性相关。

In order to understand the reproductive characteristics of Larimichthys polyactis in Zhoushan fishing ground and surrounding waters,according to the trawl and barbed wire catch samples in Zhoushan fishing ground and adjacent waters from March to May in 2020 and 2021,the reproductive population characteristics of Larimichthys polyactis and the relationship between reproductive capacity and growth indicators were analyzed,and the changes in reproductive capacity were compared and analyzed.The results showed that the body length of small yellow croaker population was 107~200 mm from 2020 to 2021,and the dominant body length group was 130~170 mm,with an average body length of 143.98±16.78 mm.The body weight ranged from 18.4 g to 108.3 g,and the dominant body weight ranged from 30 g to 70 g,with an average body weight of 46.78±16.54 g.The absolute fecundity ranged from 7 944 to 31 077,with an average of 15 545±6 019.The relative fecundity of body length ranged from 53 to 182 grain/mm,with an average of 98±31.29 grain/mm.The relative fecundity of body weight ranged from 126 to 433 grain/g,with an average of 258±60.91 grain/g.The egg diameter ranged from 0.41 mm to 2.77 mm,with an average of 1.01±0.36 mm.Studies have shown that absolute fecundity has a power function correlation with body length,and a linear correlation with body weight and pure body weight.