The Elimination of DDT-C14, Dieldrin-C14, and Lindane-C14from Fish following a Single Sublethal Exposure in Aquaria

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Abstract
Groups of 60 to 70 small bluegills, Lepomis macrochirus, and goldfish, Carassius auratus, were exposed in polyethylene tanks to 0.03 ppm of DDT‐C14, dieldrin‐C14, or lindane‐C14 for periods ranging from 5 to 19 hours. Following the exposure, these fish were rinsed with uncontaminated water and placed in 145‐liter recovery aquaria. The water in these aquaria was continuously renewed at the rate of 2.5 complete changes daily. An equivalent number of unexposed fish were also placed in the recovery aquaria to serve as controls. During a recovery period of 32 days, 10 samples, each consisting of five exposed and five control fish, were removed from each aquarium for determinations of whole‐body insecticide content. The results indicated that the initial lindane‐C14 was eliminated by both species of exposed fish within two days. More than 90% of the initial dieldrin‐C14 was eliminated in the first two weeks of recovery, however, less than 50% of the DDT‐C14 was eliminated after 32 days of recovery. These studies also showed that labeled DDT and dieldrin were readily transferred from contaminated fish to uncontaminated controls in the recovery aquaria.

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