Yellow powder is the best for rotten body of koi carp. There are many reasons for its rotten body, which may be bacterial invasion, injury or stimulation caused by water temperature change. In either case, yellow powder can be used for sterilization and treatment, and the side effects on fish are small. In addition to medication, we should stop feeding to avoid deterioration of water quality, change water regularly and heat up properly, and add a little salt to the water.

1. Stop feeding: After discovering that the fish suffers from rotten body, the first thing to do is to stop feeding. Because the appetite of the sick fish will drop, and they will not eat after feeding, and after the bait enters the water body, it will pollute the water quality and strengthen the illness of the fish. Because of the strong hunger tolerance of fish, it is no problem not to feed them for a few days.

2, the old three types: After suffering from any disease, fish must first change water, heat up and salt, which is also called the old three types. The purpose of changing water is to improve the water quality to prevent the disease from worsening, and the purpose of warming up is to stimulate the fish body, accelerate its metabolism and improve its resistance. Salt can prevent germs from invading the body with water and help it recover.

3. Soaking in medicated bath: If the illness is serious and the old three can't be cured, you need to put medicine into the jar. Oxytetracycline is usually selected. It should be noted that the dosage of this drug should be strictly controlled, otherwise it will cause poison to fish.