休渔对南海北部多齿蛇鲻资源的影响

Effect of Close Season on Bloch et Schneider ( S. tumbil ) Stock in the North of South China Sea

根据实施休渔前 1997～ 1999年南海北部底拖网调查资料 ,以及实施休渔后 2 0 0 0～ 2 0 0 2年2 0 0nmile专属经济区渔业资源调查 (南海区 )最新资料 ,综合分析南海北部实施休渔前后多齿蛇鲻资源的变动趋势。结果表明 ,实施休渔后 ,海南岛以东和北部湾多齿蛇鲻渔获率分别提高了 5 7.75%和 84 .38% ,并呈现出自然的季节变化 ,渔获群体一龄鱼以下比例减少 ,一龄鱼以上比例增加。并讨论了资源养护的对策。

The variation of the Saurida tumbil stock in the north of South China Sea is analyzed according to the survey data of bottom trawls in the north of South China Sea from 1997 to 1999 just before the close season, and according to the newest survey data of bottom trawls within 200 n mile EEZ from 2000 to 2002 when close season have been brought into effect. The results showed that the catch rate increased by 57.75 % in the eastern water of Hainan Island and increased by 84.38 % in Beibu Bay, and the normal seasonal variation also appears, the proportion of catches below I age is decreased and catches above Ⅰ age is increased. The protection countermeasures are also discussed in the paper.