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Current status of small yellow croaker resources in the southern Yellow Sea and the East China Sea

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分类：S932.4[农业科学—渔业资源;农业科学—水产科学] TV131[水利工程—水力学及河流动力学]
作者机构：[1]Third Institute of Oceanography, SOA, Xiamen 361005, China, [2]East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China, [3]Ocean University of China, Qingdao 266003, China, [4]Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences Qingdao 266071, China
相关基金：Supported by the National Natural Science Foundation of China for Creative Research Groups （No. 40821004）, the National Key Technology Research and Development Program （No. 2007BAD43B01）, and the Open Fund of Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences （No. KLMEES201001）
相关项目：我国典型海域生态系统演变过程与机制

关键词：中国东海, 南黄海, 鱼资源, 捕捞强度, 可持续利用, SYS, 影响因素, 密度指数, Larimichthys polyactis, biology, ecology, Akaike Information Criterion （AIC）

中文摘要：

我们从底部拖网调查使用了数据学习影响许多的因素小黄 croaker， Larimichthys polyactis，在南部的黄海(SYS ) 和华东海(ECS ) 。资源密度索引(RDI ) 比在春天和冬季在夏天和秋天通常是更高的。RDI 比在在夏天和秋天的 ECS 在 SYS 也是显著地更大的。小黄 croaker 的空间分发的底部水咸度和深度在在夏天的二个区域之间是类似的，但是在另外的季节不同。回归分析建议象底部水温度，咸度，和深度那样的环境因素在这些区域在夏天影响了 RDI。在二个区域的生长条件因素(GCF ) 每月变化了，在 SYS 的 croaker 在 ECS 比那些更慢慢地成长了。这由于在夏天和秋天或到在 ECS 的更高人的钓鱼的压力的黄海冷水团的低底部温度是可能的。为了保证 croaker 的持续利用，在这些储备区域，我们建议减少钓鱼的紧张，增加鳕鱼结束网孔尺寸，并且改进少年的保护。

英文摘要：

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 （RD1） 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.