Toxicity of Fintrol (Antimycin) and Prenfish (Rotenone) to Slimy Sculpin

Abstract

In 96-hr acute toxicity tests on slimy sculpins with Fintrol® exposures of 4 to 240 μg/L, the L C50 was 6.1 μg/L; and with Prenfish® exposures of 0.0156 to I mg/L, the LC50 was 0.024 mg/I,. The highest concentration ofFintrol that had no observable effect was 4 μg/L. Fintrol was less toxic to slimy sculpins than Prenfish at levels prescribed by their labels to completely remove trout. The Fintrol Use Direction Leaflet describes sculpins as sensitive species, but our results showed this species response is similar to highly resilient species such as the channel catfish (96-hr LC50 9.0 -21.7). The response of slimy sculpins to Prenfish was similar to other salmonids.