Koi fish are a great addition to any garden pond or aquarium. But whether you just brought your koi fish home or its spawning season fish friends, determining the sex of your koi fish can prove difficult for new owners. This is especially true if the koi are still young. However, determining koi fish gender is important for the health of your koi. If you can determine the gender of your koi, you can more easily watch for gender-specific sickness and disease in the koi’s life. Read ahead to learn more about koi genders!