In order to determine the optimum protein requirement in the feeds forCatla catla (Hamilton) andLabeo rohita (Hamilton), isocaloric pelleted feeds containing 20%, 30%, 40% and 45% protein were formulated using casein as the main source of protein. The best growth of catla and rohu was observed when fed on feeds containing 30% and 40% protein. The growth was poorer when fed on the diet containing 20% protein and poorest when fed on the feed containing 45% protein. The results revealed that the protein requirement of both catla and rohu was around 30%. It also indicated that more than the optimum level of protein in feeds has an adverse effect on the growth of the species investigated.