[Organochlorine insecticide and polychlorinated biphenyl residues in some fish species]

Studies were carried out on 7 kinds of fish--Black Sea scad, Aegian sardine, ocean mackerel, white hake, Danube red-fin fish, carp and trout, from fish breeding-ponds, with a purpose of finding residual quantities of chloroganic compounds. The average values found for hexachlorcyclohexane, alpha and gamma, DDT and the metabolites, the dildrine and the polychlorinated biphenyls were considerably lower than those established by other authors about the same or similar kinds of fish: sigma DDR--0.150--4.739 ppm, hexachlorcyclohexane--0.083--0.304 ppm, dildrine--0.044--0.175 ppm and polychlorinated biphenyls--1.346--7.424 ppm. The results were evaluated on the basis of fat. The lowest quantities of chlorogranic insecticides were proved in fish from breeding-ponds (carp and trout) which did not contain dildrine and polychlorinated biphenyls. A correlation was established between the lipid contents and the quantity of polychlorinated biphenyl [(r) = 0.57] in the fish. The accumulation of chlororganic compounds in the fish was in connection with the way of feeding them and depends on (scad, white hake) the season. The quantities of sigma DDT found in the fish were under the admissible norms of WHO/FAO--7 ppm on the basis of fat for fish, polychlorinated biphenyl--under the temporarily existing norms in the Federal Republic of Germany--10 ppm on the basis of fat.