This is a common disease. First, separate it from other fish, and sprinkle some salt on the affected area, and it will take about half a month.

Water management and disease prevention

In the production season, it is very necessary to replenish and replace fresh water regularly for the growth of red crucian carp. Generally, fresh water is added 10- 15 days in summer. The fresh water quantity is 20-50 cm each time. When changing water, drain the bottom of the pool first, then add water to the surface of the fragrant pond, and change the water at noon on a sunny day. At the same time, it should be started normally at noon on sunny days 1-2 hours. Water quality management: Except that the medicated bath is closed when good fish enter tang qian, strong chlorine essence is sprayed every 10- 15 days during the breeding period; The drug concentration is 0.2×10-6-0.3×10-6. In high temperature season, oral drugs such as kebaoling are added to the feed at a dosage of 1000 kg fish 100g per day and 1-2 times per month for 3-5 days each time, which can effectively prevent explosive diseases such as enteritis and hemorrhagic disease.