The investigations of zoobenthos were carried out in different seasons in 6 sections in Dongting Lake,and 58 species of zoobenthos were observed.Zoobenthos density ranged from 78 to 544.5 ind/m 2,and 10 common species displayed accumulative distribution.The results of biological assessment of water quality showed that the lake was slightly polluted,its integrated biological indices increased obviously compared with the data in 1981 and 1982,which indicated the water quality changed adversely.These results ...