Abstract: Effects of energy-protein ratio and vitamin content in the diet for tilapia on its growth were studied.In addition,the vitamin content in the pond and tank in relation to tilapia growth was determined.The results showed that as the energy-protein ratio increased,both tilapia growth rate and feed efficiency decreased.The optimal ratio of energy-protein for the young fish was 39.62-48.29 kJ·g-1.The optimal protein content was 28%-31%.The feed with added vitamins in the tank,where plankton was in less quantity than in the pond,had significant effects on tilapia growth—the rate increased with the increased amount of vitamins.