东海太平洋褶柔鱼的数量分布及其与环境的关系

Quantity distribution of Todarodes pacificus and its relation with environment in the East China Sea

利用 1997～ 2 0 0 0年在东海 4个季节的拖网以及温盐度调查资料 ,分析了东海太平洋褶柔鱼的数量分布及其与环境条件的关系。结果表明 :东海太平洋褶柔鱼分布水深在 4 0～ 175m ,集中分布水深范围在 80～15 0m。春、夏、秋三个季节的平均资源密度最高值都出现在北部外海 ,冬季的平均资源密度最高值转移到南部外海。四季都有生殖群体的存在 ,从春季到冬季 ,生殖群体的重心位置由北部外海向南部外海转移。四季生活海域的表层水温为 13.6 3～ 2 8.38℃ ,生物量高区的表层水温为 2 2～ 2 6℃ ;表层盐度为 2 7.72～ 34.72 ,集中分布海域的盐度为 32 .5～ 34.7。因此 ,东海太平洋褶柔鱼属于暖水性外海高温高盐种。

The paper analyzed quantity distribution ofTodarodes pacificus and its relation with environment in the East China Sea based on the data of trawl survey in the East China Sea in four seasons from 1997 to 2000. The results indicated that the distribution of Todarodes pacificus was at depths of 40-175 metres in the East China Sea, with concentration at a depth range from 80 to 150 metres. The maximum average CPUE appeared in north of the offlying sea in spring, summer and autumn, and shifted to south of the offlying sea in winter. There were spawning stocks in four seasons, barycenter of spawning stocks shifted from north to south of the offlying sea from spring to winter. The water temperature of surface layer was between 13.63℃ and 28.38℃,with a high biomass area of surface temperature 22℃-26℃. The salinity of surface layer was between 27.72‰ and 34.72‰, with a high biomass area in 32.5-34.7‰. So Todarodes pacificus in the East China Sea belongs to a warm offlying sea species and is characterized by high temperature and salinity.