In aquaculture, the quality of supplementary feeds forms an important determining criterion in the yield and profit. In fish culture,the cost of feed is the single largest and most important operating expense which should receive attention of the aquaculture experts. From economic point of view,it is feasible to use cheap,easily available and formulated diets, which are palatable and have high growth efficiency, protect the fish from stress and should be able to induce immunity in the fish. The authors of the book will evaluate growth parameters such as food conversion ratio, specific growth rate and gross conversion efficiency; calculate hematological parameters such as total erythrocyte count, total leukocyte count and hemoglobin concentration; calculate biochemical parameters(total serum protein, albumin and globulin).