Pesticides such as malathion, commonly used in agriculture and households, are toxic substances that lead to reactive oxygen species generation, which harms organisms. Ecotoxicological consequences of malathion, particularly its effects on antioxidants in fish, are not well understood. Thus, we investigated the effects of malathion (0.05 mg/L) on lipid peroxidation and antioxidant systems in Carassius auratus gibelio kidney, intestine, and gills following exposure times of 1, 2, 3, and 6 days. The lipid peroxidation and antioxidative defense mechanisms display different responses in investigated tissues. The lipid peroxidation was increased in all investigated tissues, especially after 1 day of malathion administration. Changes in reduced glutathione levels have been registered, mainly after 6 days of pesticide exposure. The modulation in the activities of antioxidant enzymes, catalase, gluthatione peroxidase, glutathione reductase, and glutathione-S-transferase was time and tissue specific. The investigated parameters can be used as biomarkers of fish exposure to malathion.
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