All animals use chemical compounds to supply energy and for tissue building. They must obtain their energy directly by eating plant material or by eating other organisms’ naturals. These organic maters belongs to these major groups (i.e.) proteins, carbohydrates, and fats in which energy is stored. Protein quality is includable primarily by amino acid compositors. They are made up of 20-25 amino acids. It can synthesize 10 of them (by interconversions) from each other or from other molecules of intermediary but the other 10 (essential amino acids) cannot be synthesis in the fish must be provided in the diet. They are methionine, Arginine, Threonine, tryptophan, isolucine, Leucine, valine, phenylalanie, histidine and lysine.

Following points we careful in fish feed formation :