Dietary composition for preventing and treating bacterial enteritis of grass carps and application of dietary composition

The invention discloses a dietary composition for preventing and treating bacterial enteritis of grass carps. The dietary composition for preventing and treating bacterial enteritis of grass carps comprises (2-carboxyethyl)dimethylsulfonium bromide or acceptable salts thereof. The dietary composition for preventing and treating bacterial enteritis of grass carps has the advantages that the occurrence of bacterial enteritis of cultured grass carps is prevented; and the incidence rate of the enteritis caused by aeromonas hydrophila is reduced.