1. Reason: Zebrafish may be pregnant with bulging belly. Breeders can observe whether their abdomen turns pink and their genitals protrude. If these situations occur, they are pregnant.

2. Treatment: If zebrafish become pregnant, breeders need to prepare a separate breeding environment for them. We should also prepare a stable production environment for them and wait for them to produce.

1. Reason: Zebrafish's bulging belly may also be caused by eating support, and they don't feel full. If there is food in the fish tank, they will eat it all the time. If you eat too much, it is easy to accumulate food, which leads to their abdomen becoming bulging.

2. Treatment: Breeders need to raise the water temperature to 28 ℃ first, which can speed up their digestion. Then give them some drugs to help them digest, so as to speed up their digestion.

1. Reason: Zebrafish with bulging belly may also suffer from ascites, and the main cause of this disease is visceral infection. After suffering from abdominal diseases, water will appear in their abdomen, which will cause their stomachs to become bulging.

2. Treatment: Breeders need to raise the water temperature first, which can reduce the growth of bacteria. Then add some chloramphenicol to their food. Finally, we should keep the surrounding environment stable and speed up their recovery.