The reason why koi carps eat the eyes of their companions is probably due to fighting between koi carps. Koi fish are usually very docile. If there is a conflict between their companions, they will fight. Not only will they eat their companion's eyes, but they may also bite their tails. In addition, it may be that the owner did not feed the food in time, causing the koi to be overly hungry and attack its companions.

How to prevent koi from eating the eyes of its companions

1. Isolate the fighting fish to prevent them from biting again.

2. The owner must prepare a larger fish tank and prepare enough food for the koi, otherwise the koi will hurt other fish when it is hungry.

3. If you mix different species of koi, make sure that they are close in size and have similar habits, so that there will be no problems if they are kept together.