Current status of small yellow croaker resources in the southern Yellow Sea and the East China Sea |
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| Authors: | Longshan Lin Zunlei Liu Yazhou Jiang Wei Huang Tianxiang Gao |
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| Institution: | (1) College of Life Sciences and Biotechnology, Dalian Fisheries University, 52th, Heishijiao Street, Shahekou District, Dalian, 116023, China |
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| Abstract: | We used data from bottom trawl surveys to study the factors influencing the abundance of small yellow croaker, Larimichthys polyactis, in the southern Yellow Sea (SYS) and the East China Sea (ECS). The resource density index (RDI) was generally higher in
summer and autumn than in spring and winter. RDIs were also significantly greater in the SYS than in the ECS in summer and
autumn. The bottom water salinity and depth of spatial distribution of small yellow croaker was similar between the two areas
in summer, but different in other seasons. Regression analysis suggested that environmental factors such as bottom water temperature,
salinity, and depth influenced the RDIs in summer in these areas. Growth condition factor (GCF) in the two areas varied monthly
and the croaker in the SYS grew more slowly than those in the ECS. This was likely due to the low bottom temperature of the
Yellow Sea Cold Water Mass in summer and autumn or to higher human fishing pressure in the ECS. To ensure sustainable utilization
of the croaker stocks in these regions, we recommend reducing the fishing intensity, increasing the cod-end mesh size, and
improving the protection of juveniles. |
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