Subchronic exposure to atrazine induces biochemical and histopathological changes in the gills of a Neotropical freshwater fish, Prochilodus lineatus

► Acute exposure to realistic concentration of atrazine did not affect gill function. ► Subchronic exposure to atrazine changes the activities of antioxidant enzymes. ► Subchronic exposure to atrazine causes disperse slight to moderate gill damage. ► Atrazine affect mucous cell density after acute and subchronic exposure.