Captan can enter the environment from industrial and municipal discharges, through agricultural run-off, and from spills. Also, as a fungicide and pesticide, it will be present in the environment as a result of its intended use. Acute toxic effects may include the death of animals or fish and are seen 2–4 days after exposed to captan
(Vincoli, 1997). Although toxicity mechanisms of captan were extensively studied on fish (Hermanutz et al., 1973; Hashimoto and
Nishiuchi, 1981; Mayer and Ellersieck, 1986), no work has been done on the histopathological effects of captan on rainbow trout
(Vincoli, 1997). Although toxicity mechanisms of captan were extensively studied on fish (Hermanutz et al., 1973; Hashimoto and
Nishiuchi, 1981; Mayer and Ellersieck, 1986), no work has been done on the histopathological effects of captan on rainbow trout