An experiment on the growth of common carp by feeding low (animal) protein feed when stocked at a rotatively low rate of density was conducted in 1976 at the fish pond of the National fisheries University of Busan. Three ponds averaging $454m^2$ were used with rations of different combinations of feed in respect to protein content. Each pond was equally stocked with 72 general common carp averaging 81.2g and 28 colored common carp averaging 37.8g and the fish were fed for 189 days. In the first pond where the feed with $20\%$f ish meal content ($19.0\%$ crude protein) was fed, the general common carp grew to 776.2g average (63 survived), colored common carp to 504.2g (24 survived), and total average to 701.1g (87 survived). In the second pond where $35\%$ fish meal feed ($27.3\%$ crude protein) given, the fish grew to 792.9g (70 survived), 539.1g (23 survived) and 730.1g(93 survived), respectively, and in the third pond where $50\%$ fish meal feed ($34.6\%$ crude protein) given, the fish grew to 983.7g (49 survived), 630.4g (23 survived) and 870.8g (72 survived), respectively. A significant mortality during the experiment was due to an accidental introduction of Trichodina and Dactylogyrus infected with the stocked fish under experiment at the beginning. In this experiment the rate of harvest per hectare was very low being 1,352kg, 1,495kg and 1,447kg respectively which is tess than half of the yield at general commercial fish ponds. Therefore, it is concluded that at this rate of reduced production trial, the content of protein in the feed must not be cut down from the normal level.