The chronic toxicity of 2,3,7,8-tetra-chlorodibenzo-p-dioxin (TCDD) to five selected aquatic organisms Public Deposited

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  • Five species of aquatic organisms were exposed to TCDD. Lethal effects of initial exposure to coho salmon of 23.4 nanogram TCDD/gram fish wet weight (23.4 ng/g), or equivalent to 100 nanogram per liter (100 ng/l) TCDD in water, for 24 hours were irreversible; 95% mortality occurred in 60 days. Exposure to 5.4 ng/g, 5.6 ng/l, resulted in 55% mortality. The no response level for 100% of the salmon is below 0.054 ng/g, 0.056 ng/l. Initial exposure of 14-21 day old guppies to 420 ng/g, 56 ng/l, resulted in 93% mortality in 20 days. Length of exposure affected survival time less than either level of exposure or fish size. A positive relationship exists between body size and survival time. TCDD exposure of worms, snails and mosquito larva to 200 ng/i TCDD in water affected reproduction of worms, the survival of juvenile snails and had no effect on the rate or success of pupation in mosquito larva. Analysis of TCD]J in water, with and without fish, at concentrations as low as 10 ng/1 TCDD was performed; 60% of the TCDD was recovered 4 hours after addition to water only. 48%, 39%, and 22% was recovered 24 hours, 48 hours, and 96 hours respectively in water containing fish. The fate of the unrecovered portion of the chemical is unknown.
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