1. Reason: Red spots on zebrafish belly may be caused by erythema, and the main cause of this disease is bacterial infection. In the early stage of erythema, red dots will appear on fish, but they are not obvious. If the breeder fails to treat them in time, the red spots will deteriorate into erythema, which will eventually rot and the fish will die.

2. Treatment: The breeder needs to fish them out immediately and put them in a separate container for breeding. And give them a medicated bath with yellow powder. Take a medicated bath once a day until the red dot disappears, and then stop the medicated bath. During treatment, breeders need to change their water regularly to keep the water quality of their life clean. It is also necessary to ensure that the water temperature in which they live is constant, so as to avoid discomfort caused by water temperature fluctuation.

1. Reason: Zebrafish has red spots on its stomach and may suffer from hemorrhagic disease. The main cause of this disease is vitamin deficiency or water quality deterioration. The initial symptoms of hemorrhagic disease are bloodshot or red spots on the body.

2. Treatment: The breeder needs to transfer them to a new fish tank so that they can be transmitted to other fish. Then use furazolidone or kanamycin medicated bath, once a day, stick to the medicated bath for 1 week, and zebrafish can recover.