Koi Terminology Guide
Walk into any koi dealer, open a Japanese auction list, or watch a breeder video and it can feel like you’ve accidentally tuned into a different language. Tosai, nisai, beni, sumi, kiwa, tategoi… and everyone around you is nodding like it’s obvious.
This glossary exists for one simple reason: to stop koi keeping feeling like a secret club.
Japanese terminology is baked into this hobby. It’s part of the history and part of what makes koi shows, breeding and judging work. But for newcomers and even for seasoned keepers, it can be confusing when words are used without explanation.
So this is a straight-up Koi Terminology Guide. No mystique. No gatekeeping. Just clear meanings for the words you’ll actually hear when buying koi, watching shows, or talking with breeders and dealers.
Bookmark it. Come back to it. And the next time someone says “nice kiwa but the beni’s still developing”, you’ll know exactly what they mean.
