Koi

The Koi is a rare fish found in rivers between 4pm to 9am all year round. It can be sold for 4,000 Bells at Tom Nook's store. In the 'Bugs and Fish' window in City Folk, it is described as; 'These carp are bred for viewing. Easy to raise, they can live up to 100 years.'

Further Information
The Cyprinus carpio or 'Koi' as it is better known, is an ornamental fish of the common carp variety. They are usually found in private and public aquariums and they are mainly bred for viewing purposes. Much like the Goldfish, the Koi is also interbred from specially selected Carp. Unlike the Goldfish however, these are bred from common carp (Cyprinus carpio) and have a common body shape, but with different colours (the opposite of Goldfish). They are omnivores, feeding mainly on insects and algae. The name 'Koi' comes from the Japanese, simply meaning 'carp.'