A koi's color cells sit at different depths in the skin, some right near the surface and some deeper in, which ultimately determines how bright the fish appears. The brighter the fish, the bigger ...

Koi fish are what you might call a happy accident. In the 1600s, Japanese carp farmers began noticing unusual color variations among the fish. "The popular koi fish of today are actually ...

Originally domesticated in China, these beautiful fish endeared themselves ... With more than 100 types of koi, there are many options of vibrant colors, ranging from oranges, blues, yellows ...