The monomeric amino acids commonly added in aquatic feeds are lysine and methionine, because the energy feed and vegetable protein feed in aquatic feed are two bulk materials, while the most lacking in energy feed is lysine, and vegetable protein feed is the most lacking. For methionine.

1. The nutritional benefits of lysine:

Lysine plays a very important role in maintaining the normal growth, development and normal function of the nervous system of aquatic animals. The lack of lysine in the feed causes negative nitrogen (protein breakdown and is expelled), so that the protein in the feed cannot be fully utilized, aquatic animals grow slowly, and fatty liver and bone calcification rate decrease.

2. The nutritional effects of methionine:

Methionine is an essential amino acid sulphur-containing amino acid involved in the transfer of methyl groups in aquatic animals and the synthesis of adrenaline, choline, inositol, and phospholipids in the liver. Methionine can synthesize proline, and proline has the function of protecting liver and detoxification. Therefore, methionine can promote the growth of aquatic animals and prevent the occurrence of diseases such as fatty liver and flower liver.