INishikigoi (Koi) have more than 80 varieties.
Here are the categories used at most of Koi shows.
Kohaku is Koi with red pattern on white ground. It has been said that Koi keeping begins and ends with the Kohaku. Kohaku, Taisho Sanshoku and Showa Sanshoku are the most popular varieties, and they are called "Gosanke (Big 3)."
Taisho Sanshoku is Koi with relatively spotted Sumi (black) on Kohaku pattern. Because the variety was created in the era of Taisho in Japan, it is called "Taisho Sanshoku." In short, it is also called "Taisho Sanke" or "Sanke."
Showa Sanshoku is Koi with calligraphic Sumi pattern on Kohaku. It is called Showa because the variety was created in the era of Showa in Japan. In short, it is called "Showa Sanshoku" or "Showa,"
Utsuri mono indicates varieties with calligraphic pattern on one solid ground such as Shiro Utsuri, Hi Utsuri, and Ki Utsuri