Sixty-eight fish samples were collected from typical epidemic areas of schistosomiasis prevalence. The contents of 12 CB congeners in fish samples were measured using GC / MS technique. The results indicated that 1,3-DIC,1,4-DIC,1,2-DIC and HCB were the most predominant CB congeners in the samples from the studying area. The source of HCB was PCP( pentachlorophenol),which was used to control the schistosomiasis prevalence,used in study area. And DIC came from the degradation of HCB and the articles of daily...