Mortality patterns in trout (Salmo trutta and S. gairdneri) exposed to an anionic detergent in relation to concentration and mechanisms of toxic action

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Abstract
SUMMARY. Histological and electron microscopical study of the gills of fish poisoned by the anionic detergent sodium lauryl sulphate indicates that the nature of the toxic action changes at a concentration of about 120 mg I−1. Toxicity tests were conducted to determine whether this change could be detected in the test data, using brown trout (Salmo trutta) and rainbow trout (S. gairdneri).Toxicity curves showed no indication of the change in toxic action, but at concentrations of 120 and 130 mg I−1 of sodium lauryl sulphate ‘split’ probit lines occurred, and the lines for 150 mg I−1 consistently differed in slope from other lines.