The present investigation aimed to determine the toxicological effects of diazinon (DZN) pesticide on hematological and biochemical parameters of the widely consumed Oreochromis niloticus. Adult specimens of Oreochromis niloticus were exposed to two sublethal concentrations (0.76 and 2.3mg/l) of DZN against the ameliorative effect of lycopene (10mg/kg) and vitamin E (50mg/kg) for 14 and 28 days. Empirical data of results obtained were subjected to statistical analysis of variance (ANOVA) to test the effects of DZN, lycopene (LYC), vitamin E (VE) and exposure periods. DZN significantly led to decline in red blood cell count (RBC's), blood haemoglobin (Hb), haematocrit value (Hct), white blood cell count (WBC's) and lymphocytes (LYM). While, the mean values of mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC), neutrophils (NEU), monocytes (MON), eosinophils (EOS), serum protein (total protein, albumin and globulin), glucose, AST, ALT, ALP, urea and creatinine were significantly increased from the control values. Lycopene and vitamin E supplementation play appositive role in detoxification of DZN toxicity. The results suggest that DZN can negatively affect the hematology and physiology of fish. It was observed that supplementation of lycopene and vitamin E decreases the toxic effect of diazinon.
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