Miyaishi is a third generation koi breeding family, growing several varieties including Kujaku, Shusui, Koromo, Ginrin Showa, Doitsu Sanke, Gosanke, Kin Showa. Their Kin Showa are especially famous having won several prizes in koi shows. Most recently, a Kumonryu bred by Miyaishi won Best in Variety at the 2009 All Japan Koi Show in Tokyo.