Abstract: The fresh water fish are the important source of animal protein in human population. Fish can adapt themselves to adverse environmental conditions by changing their physiological activities. Immunostimulants like amla (Phyllanthus emblica) has the additional effects such as enhancement of growth and increase in the survival rate of the fish under stress. Hematological studies on fish have assumed greater significance due to increasing emphasis on pisciculture and greater awareness on natural freshwater resources in the tropics. The present study focuses on the disease curing effect of the extracts of amla and its role on survival and mortality, opercular movement, oxygen consumption and hematological parameters, such as, leucocytes count and hemoglobin content.