POLYCHLORINATED BIPHENYLS AND ORGANOCHLORINE INSECTICIDES RESIDUES IN FISH AND SHELLFISH FROM LAKE BIWA

摘要

Results of surveys on Polychlorinated biphenyls (PCB) and organochlorine insecticides (HCH and DDT) in fish and shellfish from Lake Biwa were summarized from l987 to l996. In l975, fish and shellfish in Lake Biwa were highly contaminated with PCB, HCH and DDT but recently in l992-l996 the concentrations of these chemicals were very low and nearly constant. In the composition of HCH isomers, d-HCH was dominant in all kinds of fish and shellfish. In the composition of DDT and DDT metabolites, pp '-DDE was similarly dominant in all kinds of fish and shellfish. Further, the data in Lake Biwa were compared with those in Lake Michigan and Lake Baikal.