The rotten body of carp is usually caused by bacteria infection. Fish live in water, and the deterioration of water quality will lead to the growth of bacteria, as well as other harmful substances, which invade the fish and cause it to rot. Therefore, in the daily feeding process, we must pay attention to changing water and keep the water clean and hygienic. In addition, it is necessary to strengthen filtration, and good filtration also has certain effects on maintaining water quality.

1. Chloramphenicol: The rotten body of brocade carp may have vaccinia. After the onset of vaccinia, some white spots appear on brocade carp first, and when the later stage is serious, mucus will appear on the white spots and rot. In view of this situation, it is necessary to change water for sick fish to ensure clean and refreshing water quality. Then use chloramphenicol and other drugs to treat sick fish, stick to it for about a week, and the rotten place will be improved. At this time, you can no longer use drugs, so long as you insist on changing water and disinfecting regularly, koi can be cured.

2. Malachite green: The rotten body of brocade carp may also get mildew skin disease, which will grow a layer of white hair in the early stage, and when it is serious in the later stage, the white hair will rot. At this time, it is necessary to fish out the sick fish, clean it with salt water first, and wash off all the white hairs on the surface of the sick fish. After washing, apply 0.1% malachite green solution. Finally, soak in potassium permanganate solution for about 15 minutes.

3. Potassium permanganate: Koi may also suffer from water mold when it is rotten. At this time, it is necessary to change water immediately to ensure clean water quality. Then use potassium permanganate solution to take a medicated bath for sick fish, and the medicated bath time should not be too long, but should be controlled within 15 minutes.