If the fried scales of koi fish need to change water and heat up, and add a little salt. Fried scales are also called standing scales or loose scales. After the disease, the body surface of koi carp will swell, and some scales will open like a loose ball. The base of scales will also edema, and squeezing will exude liquid. In severe cases, even scales will fall off. This disease is usually related to the water environment, which may be the deterioration of water quality or the frequent change of water, which may cause fish to be stimulated.

1. Water quality fluctuation: Koi fish fry scales may be caused by water quality fluctuation, that is, changing water too frequently. Fish farming needs to change water, but changing water too much or too frequently will also be harmful to the health of fish. Usually, it is ok to change the water once a week, unless the fish tank is small, it needs to be changed every few days. Every time you change water, don't exceed one third of the total water volume. Generally, one fifth is enough.

2. Water temperature change: Fish, as a temperature-changing animal, has certain adaptability to temperature, but too large a temperature difference will make it uncomfortable, resulting in scales explosion. Therefore, we must pay attention to temperature control in normal times. We can keep the temperature with a heating rod and keep the water temperature above 20 ℃, which also has a good prevention and control effect on some diseases.

3. Bacterial infection: In addition to the above two reasons, bacterial infection can also lead to fried scales of koi fish. What should be done at this time is to kill bacteria with drugs, and at the same time pay attention to changing water, so as to improve water quality as soon as possible, reduce the number of bacteria in water, and help the rehabilitation of fish.