At the Igarashi Koi Farm located in Ozumi Tashiro, Nagaoka-shi, the Igarashi brothers breed almost all kinds of Nishikigoi. They focus on Gosanke but also breed other varieties such as Kawarimono. He is especially known as the creator of Kin Kikokuryu, a crossbreed of Kin Showa and Kumonryu. He has also created many high-quality Yamabuki Ogon.