Carp koi refers to a kind of beautiful domestic carp, which is bred for keeping in garden ponds for decorative purposes. Carp varieties vary in color, size and pattern. The most common colors are black, yellow, red, blue and cream. Age is determined in the same way as in trees: by the number of rings on scales. Thanks to this method, the longest-lived koi carp, Hanako, died at 226 years old, was determined. In China, koi carp is the personification of perseverance and perseverance. People even decorate their homes with carp on New Year’s Day.