Abstract 150 juveniles (mean length, 29.8cm; mean weight, 203.3g) of Clarias gariepinus were exposed to 1.00, 2.00, 3.00 and 4.00g/l of Moringa oleifera leaf powder except control (0.00g/l) for 15 days, some selected enzymes such as aspartate aminotransferase (AST), and alanine aminotransferase (ALT); haematological variables as packed cell volume (PCV), haemoglobin (Hb), leucocrit (Lct), white blood cell (WBC), differential counts (neutrophil, lymphocyte, eosinophil, monocytes and basophil), red blood cell (RBC), red cell (mean corpuscular volume – MCV, mean corpuscular haemoglobin – MCH, mean corpuscular haemoglobin concentration – MCHC were examined through standard methods. The data obtained were subjected to ANOVA and differences between means were separated with Turkey Honest significant differences at 0.05 significance level. It was observed that AST and ALT activities decreased significantly (P>0.05) with increase in phytochemical concentration when compared to control. Blood variables such as PCV, Hb, RBC, Platelets, Neutrophil, MCHC, MCV and MCH were all raised while WBC and leucocrit decreased with increase in concentration. Eosinophil, Monocyte and Basophil were not found at all.
Keywords aspartate aminotransferase (AST), alanine aminotransferase (ALT), haematological variables.