苏北浅滩生态监控区鱼卵的种类组成和数量分布

2004、2005年5月,在苏北浅滩生态监控区采用水平和垂直拖网两种方式进行了鱼卵调查,从南至北共设8个断面,范围为121°17′~121°55′E、32°00′~32°28′N。结果显示,第3~6断面(121°25′~121°36′E、32°08′~32°20′N)为鱼卵的密集区,密度最高的站位分别为2004年的7断面1站位(121°25′E、32°24′N)和2005年的5断面3站位(121°27′E、32°16′N)。主要的种类组成有多鳞鱚、鳀、斑鰶、远东拟沙丁鱼等。2004、2005年第一优势种均为多鳞鱚,2004年的第二、三位优势种分别为鳀和远东拟沙丁鱼,而2005年的第二位优势种则为斑鰶。

The species composition and quantity distribution of fish eggs in the shoal-water area along the northern coast of Jiangsu Province

The surveys of the species composition and quantity distribution of fish eggs were carried out by horizontally and vertically towing with a zooplankton net in the shoal-water area along the northern coast of Jiangsu Province during May 2004 and 2005.In the investigated area(121°17′~121°55′E、32°00′~32°28′N),8 sampling sections were set up.Results revealed that there were high abundance areas of fish eggs from section 3 to section 6(121°25′~121°36′E,32°08′~32°20′N),and the highest density appeared at station 1 of section 7(121°25′E32°24′N) in 2004 and station 3 of section 5(121°27′E32°16′N) in 2005.The main species were Sillago sihama,Engraulis japonicus,Sardinops mealnostictus,Konosirus punctatus,etc.Sillago sihama was the most dominant species in 2004 and 2005,Engraulis japonicus and Sardinops mealnostictus were the second and third dominant species in 2004,but the second dominant species was replaced by Konosirus punctatus in 2005.