To create an optimum diet, the ratio of protein to energy must be determined separately for each fish species.Excess energy relative to protein content in the diet may result in high lipid deposition. Because fish feed to meet their energy requirements, diets with excessive energy levels may result in decreased feed intake and reduced weight gain. Similarly, a diet with inadequate energy content can result in reduced weight gain because the fish cannot eat
enough feed to satisfy their energy requirements for growth. Properly formulated prepared feeds have a wellbalanced energy to protein ratio.