Crayfish diseases are less under the continuous cropping mode of shrimp and rice. At present, it is found that there are two main diseases that bring losses to crayfish culture.

1, virus disease. It is caused by virus, which shows weakness of diseased shrimp claws, hepatopancreas enlargement and dark color. Fasting, intestinal congestion, color segmentation Control method (1): spray 0.3~0.5mg/L povidone iodine or quaternary ammonium salt complex iodine twice, each time with an interval of 1~2 days; (2) splash water with100 ~150g chlorine dioxide per mu. Adding yeast immune polysaccharide to feed can play a preventive role.

2, ciliary disease. It is caused by the attachment of ciliates, which shows that a thick layer of "hair" is formed on the body surface, appendages and gills of adult shrimp, young shrimp, young shrimp and fertilized eggs. Control method (1): 0.3~0.5mg/L quaternary ammonium salt is used to spray iodine on the whole field; (2) Use fibrinogen or zinc sulfate as instructed. In addition, feeding crayfish with special artificial feed for molting can promote crayfish molting and make them shed their old shells with ciliates.