The self-cleaning ability of the cheeks is weakened, or there is bacterial infection, or the substrate is too poor.

Disinfection of water body, improvement of sediment and strengthening of prawn constitution are the most important.

Quaternary ammonium salts or bromine preparations can be used for disinfection, and a large amount of zeolite powder can be used to modify the substrate, and some polysaccharide additives can be fed.