Effects of some pesticides on the vital organs of juvenile rainbow trout ( Oncorhynchus mykiss )

Abstract Gill, trunk kidney, spleen, and liver of rainbow trout ( Oncorhynchus mykiss ) were examined after exposure to different sublethal concentrations of carbosulfan (25, 50 and 200 μg L−1 ), propineb (3, 6 and 24 mg L−1 ), and benomyl (2, 5 and 20 mg L−1 ) for 14 days. Lesions were observed in gill, trunk kidney, spleen, and liver of rainbow trout exposed to either concentration of pesticides. The most important lesions were determined in the highest concentrations of pesticides. Lamellar fusion, lamellar hyperplasia, epithelial lifting, vacuolization of epithelial tissue, epithelial necrosis, hypertrophy and sloughing of epithelium were observed on fish exposed to carbosulfan, propineb and benomyl. Fish had cell necrosis, degeneration and oedemas in liver, trunk kidney and spleen. None of these lesions were seen in control fish.