东海假长缝拟对虾的数量分布和生物学特性

The quantitative distribution and biological characteristics of Parapenaeus fissuroides in East China Sea

以渔获率表示了假长缝拟对虾在东海的数量分布 ,并对其主要生物学特征进行了研究。结果显示 ,在调查区 ,该种的年平均渔获率为 1.4 kg/ h,春季较高 ,其余季节变化不明显。但南北数量分布变化大 ,30°0 0′N以北海域密度低 ,主要密集区在 2 6°0 0′～ 30°0 0′N,6 0 m水深以东海域。以 10 0 m水深附近密度较高 ,最高站位达 2 4 .2 kg/ h,出现在春季。其主要分布区在台湾暖流海域 ,底层水温、盐度比较恒定 ,渔场季节变动不大。繁殖期 7～ 10月 ,盛期在 8月 ,8月份开始出现补充群体 ,翌年春季生长加速 ,8～ 9月达最大值。为合理利用该资源 ,建议实行春保、夏捕 ,增加补充群体资源数量 。

The quantitative distribution in terms of capture rate and the main biological characteristics of Parapenaeus fissuroides were presented.Results showed that the annual mean capture rate was 1.4 kg/h,it went slightly higher in Spring without apparent changing in remaining seasons.However,the southern quantitative distribution was different greatly from the northern with the north of 30°00′N being less populated.The most populated areas were 26°00′ ～30°00′N,the eastern areas of 60 m depth.Higher density areas were around 100 m depth with the highest capture rate reaching 24.2 kg/h,which occurred in Spring.The main distributed areas were near Taiwan warm current areas where the bottom temperature and salinity were relatively stable without obvious seasonal change.The breeding period appeared from July to October with its peak in August when the recruitment stock appeared.The stock grew faster in Spring of the next year,and matured in August or September.To make good use of the resource,it is recommended that the species should be preserved in Spring and harvested in Summer to increase recruitment stock and make more prafits.