Species composition and biomass distribution of fish eggs at inshore spawning site of Lüsi fishing ground

From April to July, 2008, by setting up 31 survey stations within the closed fishing area for bottom trawl fishery in Lüsi fishing ground (32°~34° N), we conducted 4 investigations to study the species composition and biomass distribution of fish eggs in that area. Altogether fish eggs of 12 species were found. The dominant species are Scomber japonicus (April), Ilisha elongata (May), Engraulis japonicus (June and July).The average biological density of fish eggs vertically is 1.71 ind·m^-3 (2.06 ind·m^-3 in April, 2.77 ind·m^-3 in May, 0.566 ind·m^-3 in June and 1.35 ind·m^-3 in July), while the average biological density horizontally is 6.675 ind·min^-1 (12.484 ind·min^-1 in April, 6.916 ind·min^-1 in May, 1.977 ind·min^-1 in June and 5.323 ind·min^-1 in July). The fish eggs in Lüsi fishing ground distribute more in the north than in the south.