The reason why koi fish sink to the bottom and not swim may be due to the following five reasons:

1. Koi fish also need to rest and sleep when they are sleeping. They will sink to the bottom while sleeping. , is a normal phenomenon;

2. Poor water quality may be due to the fact that the water has not been changed for a long time, resulting in poor water quality, resulting in this phenomenon;

3. Lack of oxygen, possibly Because the stocking density is too high, there is insufficient oxygen in the water.

4. The water temperature is too low. The water temperature that koi likes is 20-32℃. If the water temperature is too low, it will fall down in the tank. Because the temperature at the bottom of the tank will be slightly higher than the temperature at the top, koi will gather and hide at the bottom of the tank if the temperature is too low.

5. Cause of the disease: It may be caused by saprolegnia and white spot disease. In the early stage of the disease, koi will have reduced activity, hiding in corners, and reduced food intake. If the early symptoms are not severe, the breeder needs to immediately raise the water temperature to about 25°C, add coarse salt to the fish tank, and then turn on the oxygen pump. If the symptoms are severe, you need to take a medicated bath with potassium permanganate solution or oxytetracycline. You can take a medicated bath once a day for a week to recover.

Tip:

When it is found that the koi fish is sinking to the bottom, the owner should first find out the reason for the sinking. You can change the water first, and then increase the oxygen content in the water to see if the koi's symptoms have improved. If not, then It is most likely caused by illness, and the owner should treat the koi immediately according to the cause.