Naming
In the past it was considered a subspecies of the common carp, often under the scientific name "C. carpio haematopterus", but the two differ in genetics and meristics, leading recent authorities to recognize them as separate species. Although earlier studies also have found minor differences between northern and southern populations in Eastern Asia in both meristics and genetics, later studies have found that they are not monophyletic. However, any phylogenetic structure is difficult to establish because of widespread translocations of carps between different regions. The parent species of the domesticated koi carp is an East Asian carp, possibly "C. rubrofuscus".References:
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