Abstract
The objectives of this study were to determine the toxic effects of fenitrothion to fathead minnows (Pimephales promelas), to investigate effects of short-term exposures of fenitrothion and endosulfan on this species, and to determine if these compounds caused delayed mortality. Fenitrothion significantly reduced survival of fathead minnows at 0.86 and 0.74 mg/L during two 14-day embryo-larvae studies. In the 30-day embryo-larvae study, growth (weight) was not adversely affected at 0.13 mg/L; however significant differences occurred at 0.30 mg/L. Growth differences were more significant than survival. A 96-hr acute value for endosulfan was 1.32 μg/L (1.13–1.54) which agrees with published values. In this study, no delayed mortality occurred.
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