Species composition and abundance temporal-spatial distribution of fish egg,larvae and juveniles in Sansha Bay of Fujian

Based on the data from four investigations of fish egg,larvae and juveniles in Sansha bay of Fujian in Spring(5th and 17th May) and Autumn(14th and 30th November) of 2008,combining with historical related data,the paper analyzed and discussed species composition and abundance temporal-spatial distribution of fish egg,larvae and juveniles.Results showed that: there were 35 kinds of fish egg,larvae and juveniles(including 2 undefined species) in survey sea area,which was 9 kinds more than 1990,and 12 kinds more than 2007.Fish egg numbers of Sciaenidae and Cynoglossidae was the majority,occupying 80.63% and 14.18% in total fish egg numbers,respectively.Fish egg of hairtail,dominant species in 1990,didn't occur in this investigation,and fish egg of Labridae,dominant species in 2007 showed a small amount,only occurred in Autumn in this investigation.Distribution of fish egg had obvious seasonal change:abundance of fish egg in early May was the highest,accounting for 95.0% in total abundance of fish egg in four times,a few in late May and November.Average abundance(4.92 ind/m3) of fish egg of Spring and Autumn was higher than that of 1990 and 2007.There were a large number of fish eggs distributing in the area near the south of Sandu island and Qingshan island,Guanjingyang,Dongchongkou,and dense area was located in southwest of that of 1990 and 2007.Average abundance(0.18 ind/m3) of larvae and juveniles of Spring and Autumn was higher than that of 1990,but lower than that of 2007.Abundance of larvae and juveniles in early May was the highest,accounting for 78.6% in total abundance of larvae and juveniles in four times.Dominant species of larvae and juveniles in 1990,2007 and 2008 were Gobiidae,whose main breeding area was located in northeast and southeast of Sansha bay.