Koi fish (Cyprinus rubrofuscus) are ornamental fish known for their vibrant colors and beautiful patterns. Originating in China and later widely bred and improved in Japan, koi are now popular worldwide.

Characteristics of Koi Fish

1. Colors: Koi come in various colors, including red, white, black, yellow, blue, and gold. Some koi have combinations of multiple colors, creating unique patterns.
2. Varieties: There are many varieties of koi, such as Taisho Sanke (red, white, black), Showa Sanke (black, red, white), Kohaku, Shusui, Kin Showa, and others.
3. Lifespan: Koi have a relatively long lifespan, typically living 20 to 30 years, with some living up to 50 years or more.