Fishery resources community structure seasonal change in North-eastern Hangzhou Bay

Abstract:

The fishery resources community structure of set net was analyzed by composition and dominant species and characteristic species and abundance-biomass comparison curve based on the fishery resources data collected from Northeast Hangzhou Bay in the first three quarters of 2017.The results showed that 48 species including 30 fish species and 16 crustacean species were collected in three seasons. Jaccard similarity coefficient in different seasons was lower than 25% (significant nonsimilar level).The fish in the catch were divided into 5 ecological types according to the thermophilicity and ecological habits and crustacean species were divided into two types according to the thermal adaptation and salinity. There was no distinct change of diversity index among three seasons.Relatively higher diversity was observed in the autumn. Hierarchical cluster analysis and MDS analysis showed that the fishery resources communitie sin summer and autumn were clustered together. ABC curves showed that fishery resources communities were moderately affected in summer and autumn relative to spring.The great variation was observed in spring and summer in the Northeast Hangzhou Bay and minor variations in summer and autumn.