Species composition and quantitative distribution of fishes in spring and autumn in Jiulongjiang Estuary

Based on the data of fish resource survey from Jiulongjiang Estuary in spring（April）and autumn（November） 2013，the fish species composition，floristic characteristics and quantitative distribution were analyzed.The results showed that there were 41 kinds of fishes in mouth waters of Jiulongjiang Estuary in spring and autumn，belonging 11 orders，25 families and 35 genera，in which fishes in Perciformes were most，accounted for 46.3% in total species.The warm waters fishes accounted for 65.9%，and the demersal and near-benthic fishes accounted for 85.4% in survey waters.The dominant species were Chiloscyllium plagiosum、Johnius belengerii、Onigocia tuberculatus and Cynoglossus semilaevis in spring，the ones were Chiloscyllium Plagiosum. Raja hollandi、Dasyatis microphthalmus、Coilia mystus、Cynoglossus semilaevis and Cynoglossus joyneri in autumn,and the dominant species were 4.85kg/h and 6.40kg/h，respectively.The high value areas of fish biomass were concentrated in adjacent waters of Wuyu island in spring and autumn.