Toxicity and bioconcentration of EPN and leptophos to selected estuarine animals

A study was made to determine the acute toxicity of the insecticides EPN and leptophos to several estuarine species; the accumulation of the insecticides in flowing sea water, and in body tissues of animals surviving a 96-hour test; the chronic toxicity of the insecticides to the estuarine mysid, Mysidopsis bahia; and their uptake rates, depuration rates, and bioconcentration factors. The results, presented with graphs and tables, indicate that if EPN or leptophos polluted estuarine environments at levels equal to or greater than 1 g per litre, the most damaging effect on crustaceans and possibly fish would result from acute toxicity rather than chronic toxicity or bioconcentration.