Koi are actually a type of carp, and today they're some of the most ... For example, there are koi with light blue spots, ones with large red patches on their backs, or all-metallic gold.

white and blue. "There are more than 100 varieties in koi, but they are all the same species," Kodama says. "They are carp, they just have different looks." It's true: There are over 100 different ...