White spots on a fish mean that the fish is suffering from white spot disease. There is a kind of parasite called melon worm in tap water. They will multiply in large numbers when the water temperature is relatively low, thereby infecting fish and causing the fish to suffer from white spot disease. Therefore, when raising fish, the water temperature should not be too low. When fish suffer from white spot disease, they can also kill small melon worms in the water by raising the water temperature.

Tip:

When a fish suffers from white spot disease, the owner should isolate the sick fish in time, change the water, increase the water temperature, and add an appropriate amount of coarse salt for disinfection and sterilization. If the fish's condition is not very serious, rest it for a few days. The condition will get better, but if the condition is more serious, you need to take a medicated bath with the use of therapeutic drugs.