Koi have six types of color cells in their ... It won grand champion at the All Japan Koi Show in 2017, and is the most expensive koi fish ever sold. Koi may just look like an oversized goldfish ...

Originally hailing from Japan, these beautiful fish have amazingly patterned bodies. There are many varieties–– and some of ...

They coexist well with goldfish if both species' needs are equally ... gene pool and achieving larger sizes. The best koi fish also rarely leave Japan, making it harder for outside breeders ...