Koi fish are colorful and elegant

Koi, an animal belonging to Cyprinidae, is a kind of high-grade ornamental fish. It has the reputation of "living gem in water" and "art that can swim". Koi can reach a length of 1-1.5 meters. It is distinguished by different colors, patterns and scales. It is mild, likes to swim in groups, easy to raise, and has strong adaptability to water temperature