The analysis on fish stock characteristics in the distribution areas of large jellyfish during summer and autumn in the East China Sea region
The analysis on fish stock characteristics in the distribution areas of large jellyfish during summer and autumn in the East China Sea region
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发表时间：
2005
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通讯作者：
Jia-hua Cheng
中科院分区：
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作者：
Jia-hua Cheng
根据1999 ~ 2004年夏秋季大型水母分布区的水母资源和鱼类资源资料，分析了该地区的鱼类资源特征。结果表明，海蜇夏季主要分布在30°30′N~33°00′N海域，秋季主要分布在32°00′N以北海域，夏秋季逐渐向北方地区迁移。在2003年的主要水母分布区中，2003年水母的数量最多，鱼类的种类和CPUE最少，Margalef的物种丰富度指数也最小。水母主要分布区鱼类的优势度发生了明显变化，2003年优势种变为斜纹石斑鱼。与2000年相比，2003年海蜇主要分布区带鱼、小黄鱼和银鲳幼鱼的比例有所下降。银汉鱼的条件因子增加，而多乳银汉鱼的条件因子降低; 2003年的情况没有显著变化。初步解释了海蜇高发区鱼类资源性状变化的原因，并提出了控制海蜇水华的措施。
The fish stock characteristics in the distribution area of large jellyfish were analyzed in summer and autumn from 1999 to 2004 based on the jellyfish and fish stocks data. The results showed that jellyfish were mainly distributed in the sea area of 30°30′N～33°00′N in summer and north of 32°00′N in autumn, and gradually moved to the northern area from summer to autumn. The jellyfish was found the greatest quantity in 2003, whereas the fish species and CPUE were the smallest, and Margalef's species abundance index was the least too, in the main jellyfish distribution area in 2003. The dominance of fishes in the main jellyfish distribution area changed significantly; the dominant species altered to Lophius litulon in 2003. The percentages of juvenileTrichiurus japonicus, Pseudosciaena polyactis, and Pampus argenteus were less in the main jellyfish distribution area in 2003 compared with that in 2000. The condition factor of P. argenteus increased, but that of P. polyactis decreased, and that of T. japonicus was no remarkable change in 2003. The reasons for the changes of fish stock characters in higher jellyfish distribution area were preliminarily explained, and the control measures of jellyfish blooms were advised.