Koi have beards. They are bred from carp, so they have the same characteristics as carp. Normal koi has two pairs of beards, the upper pair is smaller and the lower pair is larger. If there is no beard, it may be broken, or it may be other kinds of fish, not koi fish. As a common high-grade ornamental fish, its size is very large, so it is best to prepare a large fish tank for artificial breeding, and pay attention to oxygenation at the same time.

1. Change water properly: If the beard of koi carp is broken, change water properly first. On the one hand, the broken beard may be caused by the deterioration of water quality. Changing water can improve the water environment and prevent fish from getting sick. On the other hand, it is to avoid wound infection after breaking, so change the water once, which can reduce the possibility of getting sick.

2. Raise the water temperature: After the beard is broken, koi fish will also grow a new beard, but it takes a little time. If the water temperature is properly raised, it will promote the metabolism of fish and accelerate its growth. Moreover, when the temperature is high, the fish will become more lively and beneficial to its health.

3. Add a little salt: In order to prevent the wound from being invaded by bacteria, it is best to add a little salt after warming up. Salt can improve the osmotic pressure of water, thus reducing water infiltration and playing a very important role in restoring the health of fish. Usually, salt can't be added more, and the concentration can be controlled below five thousandths.