INDUCTION OF MACROCYTIC-NORMOCHROMIC ANAEMIA IN Clarias gariepinus –Siluriform- EXPOSED TO SUB-LETHAL CONCENTRATIONS OF 1, 1-DIMETHYL 4, 4-BIPIRIDILLIUM DICHLORIDE (PARAQUAT) UNDER LABPRATORY CONDITIONS
Introduction: Macrocytic-normochromic anaemia was induced in Clarias gariepinus at intervals of 1, 7 and 14 days. Experimental fish were exposed to test water separately diluted with sub-lethal concentrations of paraquat of 0, 0.03, 0.05, 0.07 and 0.09mg/L. 14 days. No in-depth work has been carried out on Macrocytic-normochromic anaemia in Nigeria. Objective: to evaluate macrocytic-normochromic anaemia in Clarias gariepinus exposed to sublethal concentrations of paraquat. Methods: Blood were collected at intervals of 1, 7 and 14 days .Results: Blood dyscrasias was observed with a significant (p<0.05) decrease in haemoglobin, haematocrit, red blood cells, white blood cells, lymphocytes and monocytes. Mean corpuscular volume (MCV), Mean corpuscular haemoglobin (MCH), Neutrophils, Eosinophil and Basophil increased significantly (p<0.05) with increasing concentrations of the toxicant while Mean corpuscular haemoglobin concentration (MCHC) remained normal. Conclusion: Sublethal concentrations of paraquat induced macrocytic-normochromic anaemia in the exposed Clarias gariepinus.