Pesticides in the Edible Portion of Fish from Iowa Waters by the State Hygienic Laboratory in cooperation with the Iowa State Conservation Commission, March 31, 1970

(1970) Pesticides in the Edible Portion of Fish from Iowa Waters by the State Hygienic Laboratory in cooperation with the Iowa State Conservation Commission, March 31, 1970. University of Iowa

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Abstract

Surveys of rivers in and bordering Iowa have shown the presence of measurable amounts of chlorinated hydrocarbon insecticides for a number of years (l, 2 ,3). Fish living in these waters will act as biological concentrators, extracting pesticides from their food and the water and storing these pesticides in their tissues. Because of this, the concentration of these toxic chemicals in the fish may be much ·greater than that actually measured in the water. Actual concentrations in the fish will depend on such factors as type of diet and the fat content of the fish tissues as well as concentration in the aquatic environment so that a considerable variation of pesticide content should be expected from different species taken from the same waters.