Black spots on goldfish may be caused by black spot disease. The owner can sprinkle an appropriate amount of oxytetracycline and yellow powder into the fish tank until the goldfish's symptoms improve. The main pathogens of black spot disease are water mold and mold. It is usually caused by parasites on the body surface of goldfish, or the body surface is injured and infected with bacteria. The owner can sprinkle an appropriate amount of salt into the fish tank to inhibit water mold.

Tip:

Black spots will appear on the body surface of goldfish after being frightened, but these black spots will disappear after a period of time, which is a normal phenomenon. Some goldfish will also have black spots during the discoloration period, mainly due to living environment factors. . In addition, when raising goldfish, owners should change the water regularly to maintain water quality.