Reproductive Status of Larimichthys polyactis in Zhoushan Fishing Ground and Adjacent Waters from 2020 to 2021
2022
Yali WANG | Cuilin HU | Kaida XU | Yongdong ZHOU | Rijin JIANG | Zhenhua LI | Xiafang LI
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 18.4g to 108.3g, and the dominant body weight ranged from 30g 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.
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