The acute and chronic effects of Deltamethrin insecticide on brain acetylcholinesterase, blood catalase enzymes and histopathology of Carassius auratus in the presence of vitamin C

The aim of this study was to determine the acute and chronic toxicity of Deltamethrin insecticides and its effect on the activity of brain acetylcholinesterase and serum catalase enzymes and gill and liver tissues of Carassius auratus in the presence of vitamin C. In the acute toxicity test, LC50 of Deltamethrin was calculated by Probit test analysis and the effect of its chronic concentration were investigated on fish (10 ± 0.5 g) in four treatments: one control (no poison and vitamin), two (0.0158 ppm Deltamethrin), three (0.0158 ppm Deltamethrin + 200 mg/Kg Food Vitamin C) and four (200 mg/Kg Food Vitamin C). At the end of the experiment, blood and gill and liver tissue samples were prepared for enzymatic and pathological studies. The results showed that Deltamethrin (treatment 2) reduced the activity of acetylcholinesterase and catalase compared to control, which this decrease was significant for acetylcholinesterase (P<0.05). However, vitamin C significantly (P<0.05) increased activity of this enzyme in treatment three compared to the second treatment. Deltamethrin (treatment two) causes necrosis, shortness, attachment and hyperplasia of secondary lamella in gill tissue, and bleeding, necrosis and formation of fatty vacuoles in the liver tissue. The severity of tissue damage in treatment three (Deltamethrin and Vitamin C) was lower than the second treatment (Deltamethrin). According to the results, vitamin C in the Carassius auratus fish diet improves the enzymatic conditions of the antioxidant system and reduces tissue damages caused by Deltamethrin in the gills and liver tissues of fish.