Abstract: With the continuous development of aquaculture in China, fish deformity is a common problem in the process of aquaculture. Deformities caused by feeding problems may weaken the feeding ability of fish, affect their growth and even die. In the sales process, deformed fish will also have sales difficulties due to their poor appearance, which will affect the income of farmers. This paper analyzes the causes of fish deformity at present, and puts forward the corresponding prevention and control measures, hoping to provide reference for the prevention and control of fish deformity.