ORGANOCHLORINE PESTICIDE-RESIDUES IN MUSCLE-TISSUE OF RAINBOW-TROUT, ONCORHYNCHUS-MYKISS, TAKEN FROM 4 FISH FARMS IN LEON, SPAIN

Levels of nine organochlorine pesticides (lindane, heptachlor epoxide, aldrin, dieldrin, endrin, o,p'-TDE, p,p'-TDE, p,p'-DDE and p,p'-DDT) were determined in muscle samples of rainbow trout, Onchorhynchus myki ss, collected from four fish far ms in the province of Leon, in the no rth-west of Spain (Europe). The highest incidence percentage was for l indane (67.5%) and heptachlor epoxide (55.0%). Organochlorine residue levels detected contributed slightly to acceptable daily intakes (ADIs ) established by the Food and Agriculture Organization of the United N ations and the World Health Organization (lindane 0.22-2.3%; Sigma DDT 0.05-0.46%, heptachlor epoxide 10.0-71.4% and Sigma dieldrin 16.7-33. 3% assuming 300g of trout muscle as a mean daily intake). The highest concentration Sound was for heptachlor epoxide (0.043 mu g/g).