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11-08-2010, 02:52 PM #1
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Absence of acclimation to parathion by rainbow trout during sublethal exposure
By Walter P. Banas, John B. Sprague
Water Research, Volume 20, Issue 10, October 1986, Pages 1229-1232, ISSN 0043-1354, DOI: 10.1016/0043-1354(86)90151-X.
After 1, 2, 3 and 5 weeks of pre-exposure to 0.31 mg l-1 of parathion, rainbow trout (Salmo gairdneri) did not change their tolerance of lethal levels of the organophosphate insecticide. This pre-exposure concentration represents 0.25 of the mean control incipient lethal concentration. Thresholds of lethality were reached at 120-144 h for all lethal tests though mortality commenced 12-24 h earlier in lethal tests using pre-exposed fish. Both groups grew during the pre-exposure, but dry weight of pre-exposed fish was only 0.75 of control weight at the end of the pre-exposure. Parathion pre-exposed fish also showed reduced appetite and activity.
Keywords: acclimation; parathion; rainbow trout; Salmo gairdneri; toxicity