摘要
于1985年8月—1986年8月间,在长江口海区(30°45′—32°00′N,124°00′E以西)周年生态调查表明:鳀鱼鱼卵和仔、稚鱼的出现数量,占该区各种鱼卵和仔、稚鱼总量的首位。其中,垂直网采到的鳀卵和仔、稚鱼分别为同网型总量的82.72％和45.90％,而表层网的则分别为82.73％和54.64％。鳀卵出现在全年的4月中旬—10月中旬,以5,6两月为鳀卵集中出现的月份。鳀卵分布区的表层水温为17.0—24.5℃,表层盐度为22.50—30.50‰;122°30′E以东的海区为鳀鱼的主要产卵场,成鱼在该区作自东向西,再折回东部的生殖洄游。 康氏小公鱼卵和仔、稚鱼的出现数量,占调查区第二位。其中在垂直网中的出现数量,分别占卵和仔,稚鱼总量的3.39％和3.48％,表层网的分别为5.12％和6.34％。生殖期在6月中旬—10月中旬,盛期在7—9月。产卵时的最低表层水温在21.0℃以上,适盐广泛。主要产卵场是122°30′E以西的南、北近岸河口浅水区,成鱼生殖时作自南向北的生殖洄游。 两种鱼在调查区的鱼类组成和食物链中占有极为重要的位置,并有着较丰富的资源潜力。
This outcome is report of a year long research from August 1985 to August 1986 by the R/V 'Jinxing-2' in the Changjiang River estuary.The eggs of Engraulis japonicus occur from mid-April to mid-October, more abundantly in the months of May and June. The optimum surface temperature and salinity for spawning are respectively 17.0-24.5℃; 22.50-30.50‰. The spawning area is in the east region 122°33'E of 30-50 m depth. The spawning migration is from east-west-east for the spawning stock fishes.The eggs of Anchoviella commersonii occur from mid-June to mid-October, more abundantly in July-September. The optimum surface temperature is 21.0℃ or higher, and the optimum surface salinity is 15.00‰ or less. The spawning area in the Changjiang River estuary region is less than 20 m offshore area west of 122°30' E and spawning migration is from south to north range.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1989年第3期217-229,共13页
Oceanologia Et Limnologia Sinica
