Some fish will use other auxiliary respiratory organs to stick their heads out of the water and expose their mouths to breathe fresh air in the case of hypoxia. This is commonly known as the goldfish floating head phenomenon.

1. Check the weather. Rainy days during the day, rainy days at night, continuous cloudy and rainy days, and no rain for a long time may bring about hypoxia problems.

2. Look at the water quality. Water that is very green or very clear can also cause floating heads.

3. Look at the creatures in the water. petsnet analysis, if a large number of microorganisms in the water die due to weather or the use of drugs, it is also easy to cause floating heads.

4. Look at the water color. The sudden change of water color indicates that the species of phytoplankton in the water has changed. The death of phytoplankton may decompose toxins, stimulate the respiratory system of fish, affect the exchange of oxygen, and cause floating heads.

5. Check the gills. If there are a large number of parasites on the gills of goldfish, accompanied by the occurrence of diseases such as rotten gills and gill mold, it will also cause difficulty in breathing and cause floating head phenomenon.