Two hundred seventy fingerlings (average weight 4.71±0.012g) were randomly distributed in six treatment groups in triplicates of control (T1), 0.1 g kg^-1 (T2), 0.2 g kg^-1 (T3), 0.4 g kg^-1 (T4), 0.8 g kg^-1 (T5) and 1.6 g kg^-1 (T6) supplemented with ethanol extract of lapsi fruits in the diet containing 40% protein. Fingerlings were fed at 3% of body weight twice daily. Significant differences (P<0.05) were observed in haematological parameters of treated diets fed groups to that of control diet fed group. Haemoglobin (Hb), red blood cells (RBC), packed cell volume (PCV), White blood cells (WBC) and other blood indices were observed to be significantly higher in the treated groups as compared to the control. It was concluded that a minimum amount 0.4% (0.4g kg^-1) of lapsi fruit extracts in fish feeds elicited more increase in haematological parameters of common carp. Inclusion of lapsi fruit extract at 0.4% concentration is therefore beneficial for use in aquaculture to enhance immunity in common carp.