The rotten mouth disease. The hanging mouth of the yellow fin and the gill cover are like white cotton balls, which are gradually infested and rotted; loss of appetite, slow movement, and then death. This disease is very contagious and can lead to the death of the entire tank within a few days. .

Etiology: caused by parasitic water bacteria. Deterioration of water quality makes it easy for bacteria to multiply.

Treatment: take more than 13 mg of tetracycline and one liter of water as After hoisting the yellow fin into the treatment box for about six to seven days, half of the water was replaced every day, and the original dosage was maintained.