The term CARP JAPANESE refers to the traditional Japanese practice of keeping and breeding carp. KOI is a type of ornamental fish, which is a domesticated version of the common carp. ENDO is a type of carp breeding technique that involves selecting and breeding the most desirable traits in carp. NAG is a type of carp that has a black and white pattern on its scales. All three terms are related to the practice of carp breeding in Japan, which has been practiced for centuries.