Koi carps are extremely effective fish, bred, among others, in in ponds and ponds. The name of the fish is an abbreviation of the Japanese phrase nishiki-goi, translated as glitter carp. Nearly 120 varieties have been distinguished, the representatives of which differ, among others, in color, pattern of scales and size. Koi carps are a long-lived fish with a life expectancy of between 25 and 35 years. However, there are specimens that live up to 50 years. The absolute record holder is the Hanako carp, which lived up to 226 years (born around 1751, died on July 7, 1977).