Current status of small yellow croaker resources in the southern Yellow Sea and the East China Sea
Current status of small yellow croaker resources in the southern Yellow Sea and the East China Sea
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DOI：
10.1007/s00343-011-0182-8
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发表时间：
2011-05-01
影响因子：
--
通讯作者：
Gao Tianxiang
中科院分区：
文献类型：
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作者：
Lin Longshan;Liu Zunlei;Gao Tianxiang
利用底拖网调查资料，对南黄海和东中国海小黄鱼丰度的影响因素进行了研究。资源密度指数(RDI)夏季和秋季普遍高于春季和冬季。在夏季和秋季，南方红壤的RDIS也显著大于欧洲红壤。夏季两地小黄鱼底层水盐度和水深的空间分布相似，但其他季节不同。回归分析表明，底层水温、盐度、水深等环境因子对该地区夏季RDI值有影响。两区大黄鱼生长条件因子(GCF)各月变化较大，大黄鱼生长慢于大黄鱼。这可能是由于夏季和秋季黄海冷水团的底层温度较低，或者是由于ECS的人类捕鱼压力较高。为了确保可持续利用这些地区的大黄鱼种群，我们建议降低捕捞强度，增加鳕鱼网目尺寸，并加强对幼鱼的保护。
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.