Question: are koi and carp the same thing?
Answer: Koi, though, were developed from Amur carp in Japan in the 1820s. Koi are domesticated Amur carp (Cyprinus rubrofuscus) that are selected or culled for color; they are not a different species, but a subspecies, and will revert to the original coloration within a few generations if allowed to breed freely.