1. Bite injury: The fin bifurcation of carp is probably bitten. It is best not to mix koi with other fish. Some smaller fish sometimes bite it. If aggressive fish are found in the fish tank, it is best to isolate it. In addition, bites have certain risks. If they are not isolated and disinfected in time, they may be infected or even rotted, so they need separate treatment.

2, poor water quality: Besides bite, fin bifurcation may also be caused by poor water quality. Koi live in water, and the quality of water has a great impact on its health. If the water quality deteriorates, the fish will get sick, not only the fins will bifurcate, but also rot. In order to avoid the deterioration of water quality, koi fish should be changed regularly, usually every five to seven days, and each time the water should not exceed one third of the total amount, so as not to cause irritation.

After finding fin bifurcation of carp, it should be isolated first to avoid further deterioration of the situation, and if it is caused by disease, it can also prevent infection. Isolated koi fish should be raised with the original tank water, and the water should be changed regularly. At the same time, a little yellow powder can be added to the water, which can play a role in disinfection and sterilization, and can also treat some diseases. In addition, it is necessary to properly heat up and promote metabolism, which is also beneficial to its rehabilitation.