Abstract: DDT is a representative of persistent organochlorine pollutants. With Protosalanx hyalocranius, Coilia nasus and Salangichthys tangkahkeii as test objects, a food web model of main economic fishes in Taihu Lake was established, with which, the distribution characteristics of DDT in the benthos, zooplankton and fishes of the food web were studied by Monte Carlo simulation method, and onehit model was used to approach the ecological risk of the DDT distribution. The results showed that the accumulation amount of DDT in P. hyalocranius, C. nasus and S. tangkahkeiiwas 0-0.329 (averaging 0.039) mg·kg^-1, 0-0.188 (averaging 0.022) mg·kg^-1 and 0-0.575 (averaging 0.067) mg·kg^-1, respectively, and the accumulation character of liposoluble contaminants was the main factor controlling the DDT distribution in economic fishes in Taihu Lake. The overall status of the ecological risk of DDT accumulation in test fishes was the highest for S. tangkahkeii, followed by P. hyalocranius, and C. nasus.

Key words: Taxus chinensis var. mairei, Life table, Survival curve, Spectral analysis