show Abstracthide AbstractPolysaccharides from plants have been an interesting subject in the biological activity against the infection by activating complement, regulating the production of cytokines, and inducing interferon. Procambarus clarkii, as one of the largest freshwater crustacean sources with high-quality protein and has significant commercial value. Therefor, it is of great significance to study the immune action of polysaccharide in crayfish.