DDT·PCB Residue of Wild and Cultured Yellowtail in 1979 and 1981 / 日本農村医学会雑誌

ABSTRACT

DDT, one of the residual organochlorine pesticides, has been still used in China and perhaps in developing countries of the equatorial hemisheric zone. Therefore, wild and cultured yellowtails were selected as the indices of DDT residue levels of the marine fishes, considered a main source of the residue in the general population of Japan.<BR>Total DDT level of wild one, large type of fishes distributed from South China Sea to nearly north end of Hokkaido in latitude, increased severalf old during two years from Feb.-Mar. 1979 to Mar. 1981. Consequently, the levels of total DDT in wild yellowtail were higher than those in cultured one in 1981. It is noteworthy that especially three wild fishes catched from Nagasaski area were not only high in the levels, but low in the ratio of pp-DDE plus pp-DDD per total DDT. It is suspected that they were going forward to North with the Japan Current. Close relations were recognized among DDT residues, PCB patterns and sea areas catched, and marked differences of the residue levels were observed on account of the areas.<BR>Furthermore, slight increase was also recognized about the level of cultured type in 1981 compared to the samples in 1979.<BR>On the other hand, the level of dieldrin was higher in the cultured one than the wild as well as in the two years before.