Community structure of fish in Zhoushan Fishing Ground and its adjacent waters in spring and summer

Based on the investigation data of the fishery resources and environment in Zhoushan Fishing Ground and its adjacent waters in August 2006 and April 2007,and by using multi-dimensional scaling (MDS) and canonical correspondence analysis (CCA),this paper studied the species composition and the characteristics of fish community in the area.In spring,a total of 62 fish species were captured,belonging to 56 genera,36 families and 11 orders.The dominant species were Amblychaeturichthys hexanema and Larimichthys polyactis,and their abundance occupied 82.9% of the total.In summer,58 fish species were captured,belonging to 51 genera,38 families and 11 orders.Amblychaeturichthys hexanema,Champsodon snyderi,Dysomma anguillaaris and Acropoma japonicum were the dominant species,with the abundance accounted for 60.8% of the total.In the two seasons,twenty stations were separated into three groups.Among the fishes captured,26 and 30 fish species had an occurrence rate larger than 5.0% in spring and summer,respectively,and formed two and three assemblages correspondingly.