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ABSTRACT'ArocIor 1254' was fed to laying pullets at 0, 0.1, 1, 10, and 100 mg per kg of diet. After 24 weeks the concentration of total polychlorinated biphenyls in body fat was 11-17 times the dietary level and the relative concentrations in body fat, liver, muscle, and whole eggs were 40, 4, 1, and 1, respectively. The concentration in body fat and in eggs was reduced to one half 14 weeks and 6 weeks respectively after withdrawal of the treated diet. Live body weights, brain, kidney, and egg weights, and eggshell thickness were unaffected. High doses generally increased liver and heart weights. Egg production and hatchability were reduced at higher doses. No signs of toxicity were observed. The use of local meat meal and fish meal in a mash is not likely to result in any significant accumulation of polychlorinated biphenyls in poultry products.

From 12 rainbow trout (Salmo gairdneri Richardson) taken from each of three lakes (Rerewhakaaitu, Opouri and Okataina) in the Rotorua district, N.Z., samples of liver, skeletal muscle and, from mature fish, the gonads were examined for organochlorine insecticides. Lindane, heptachlor and heptachlor epoxide were not detected in any of the samples. Traces of dieldrin were detected only in trout taken from Rerewhakaaitu Lake. In all fish examined, pp'-HDT, pp'JDOD and pp'-DDE were detected in all three tissues. The highest concentrations were found in some of the ovaries of fish from Rerewhakaaitu Lake, the catchment area of which had been extensively topdressed with DDT. Although most of the catchment area of Lake Okataina had never been topdressed with DDT, fish from this lake contained small amounts of DDT and its metabolites.

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