东海区七星底灯鱼数量分布以及与温盐度的关系

本文利用从2000年12月到2001年9月一个周年的渔业资源调查数据,对东海区七星底灯鱼的数量分布及其与温盐度的关系进行了研究。结果表明:东海区的七星底灯鱼可分为东海北部和浙江中南部近海2个群体。以东海北部群体较大,主要分布在30°N以北的海域;浙江中南部近海群体较小,且只有零星分布。七星底灯鱼在东海北部海域从沿岸到外海都有分布,但沿岸数量较少,主要分布在30°30′~32°30′N、124°00′~126°30′E之间的海域;以冬春季节分布面较广,夏秋季节的分布面较窄。东海北部群七星底灯鱼栖息海域的表层温度值变化较大,以春季最低,秋季最高;密集分布区的等温线变化范围在1~2℃左右。浙江中南部近海群的栖息水温变化较小,全年都在20℃以上。各季节浙江中南部近海群的适宜水温均高于东海北部群。各季节东海北部群密集分布区的表层盐度在32.0~34.5之间,以冬春季的盐度值较高,夏秋季的盐度值较低;浙江中南部近海群的栖息海域表层盐度除冬季较高外,其余季节相对较低。

Quantity distribution of Benthosema pterotum and in relationship with surface layer water temperature and salinity in the East China Sea region

Based on the data of fishery resources survey in the East China Sea from December 2000 to September 2001,the paper deals with the quantity distribution of Benthosema pterotum and its relationship with surface layer water temperature and salinity.The results indicate that the colony of Benthosema pterotum is divided into the northern East China Sea group and the ZheJiang south central offshore group,of which the former was relatively bigger,which is mainly distributed in northern sea area of 30°,while the latter was smaller,which is only distributed in some parts of the area.Benthosema pterotum is distributed from the coast to offlying sea in the northern East China Sea,but its quantity is smaller in seacoast,which is mainly found in the sea area between 30°30′~32°30′N and 124°00′~126°30′E.Its distributing range is relatively bigger in winter and spring and smaller in aummer and autumn.The inhabiting water temperature varied greatly in the group of the northern East China Sea,with the lowest in spring and in autumn.The range of isotherm in dense distribuing area was about 1~2℃.The range of inhabiting water temperature was very small in the ZheJiang south central offshore group,with over 20 ℃ all the year round.The inhabiting water temperature suitable for ZheJiang south central offshore group is higher than that of the group of the northern East China Sea in each season.The surface layer salinity of dense distributing area of the group of the northern East China Sea was 32.034.5 ‰ in each season,with higher in winter and spring and lower in summer and autumn.The inhabiting surface layer salinity of the ZheJiang south central offshore group was relatively lower in each season except in winter.