The objective of this study was to observe the effect of 2-4 dichlorophenoxy acetic acid on the haematology of Clarias batrachus fish. The haematological parameters studies such as Red Blood Cell (RBC), White Blood Cell (WBC), differential lucocytes counts (neutrophils, lymphocytes, eosinophils and monocytes), Hb %, platelets, Mean Corpuscular Haemoglobin (MCH), Mean Corpuscular Volume (MCV) and Packed Cell Volume (PCV). The results revealed a significant decrease in Red Blood Cell (RBC), Hb %, platelets, Mean Corpuscular Haemoglobin (MCH), Mean Corpuscular Volume (MCV) and Packed Cell Volume (PCV) levels but White blood cells (WBCs) count and neutrophils, eosinophils, basophils, monocytes were increased and fluctuated significantly in experimental group compare with control group. Thus on the basis of obtain result in the present investigation it can be concluded that 96 hrs. exposure of 34.64 ppm of 2-4 D aqueous solution has toxic effect and suggests that exposure of 2-4 D could cause some level of stress as indicated by changes in the haematological indices of the fish under consideration.
