Application of (2-carboxyethyl) dimethyl sulfonium bromide in preparation of mixture for enhancing grass carp skin barrier function

The invention discloses an application of (2-carboxyethyl) dimethyl sulfonium bromide in preparation of a mixture for enhancing a grass carp skin barrier function; the (2-carboxyethyl) dimethyl sulfonium bromide is added into grass carp feed as an enhancer, so that the expression of grass carp skin barrier functional factors can be regulated and controlled, the fish skin barrier function can be enhanced, and the capacity of fish skin for resisting red skin diseases caused by pseudomonas fluorescens is improved, so that the growth of grass carps is promoted, and the feed conversion efficiency is improved.