Koi with black markings on a white, red, or yellow base are called Bekko koi.
(1) Shiro Bekko: Shiro Bekko refers to Taisho Sanke koi without the red patterns, meaning koi with black markings on a white base. In China, it is often referred to as "Bekko." Those with a pure white head, without a yellowish tint, are considered high-quality specimens.
(2) Aka Bekko: Koi with a red base and black patterns on the back are called Aka Bekko. The texture and appearance of the black markings are exactly the same as those on Shiro Bekko.
(3) Ki Bekko: Koi with a yellow base and black markings.
(4) German Bekko: Bekko koi of the German system.
