| abstract |
(57) [Problem] To provide a fermentation additive to be added to a compound feed, which promotes fish growth and maintains health while using a compound feed having a high content of vegetable protein. SOLUTION: As a medium, a protein-containing substance obtained by adding one or more of carbohydrates, amino acids, vitamins, and minerals to a protein is used as a medium, and a fermented product obtained by fermenting the medium with a useful microorganism group is used as a feed. Additives. |