Aoki Koi Farm ( Ao Aokiya) – is run by Haruo Aoki and Motoyoshi Aoki in the Katakai region. Established more than 20 years ago, they have become well known within Japan and around the world for their varieties of Goshiki, Doitsu Goshiki, Kikusui, Yamatonishiki, Doitsu Kohaku, Doitsu Sanke, Doitsu Hariwake, Kujaku, Kawarimono and others.
At Aoki Koi Farm, they also focus on creating new varieties of koi. They are quite famous for introducing the Kikokuryu and Beni Kikokuryu to the world.