The present study aimed to investigate the effects of sublethal concentrations of pesticide profenophos on the haematological parameters (RBC, WBC and Hb content) of freshwater climbing perch Anabas testudineus. Fishes exposed to 10% and 30% sublethal concentrations of profenophos (96 h LC50 – 0.5 ppm) for 10,20 and 30 days. The RBC and Hb content of blood decreased after chronic exposure to the profenophos. On the contrary, there was an increase in the WBC count of fish following their exposures to profenophos compared to the corresponding control.