Their cells can be red, yellow, black, white, blue, or metallic ... and is the most expensive koi fish ever sold. Koi may just look like an oversized goldfish, but they're not even remotely ...

There are platinum versions of many koi fish today, but the Ogon is ... Unlike other koi, it has an unstable sumi or black coloration. The Kumonryu has a white base color with black patterns.