Isa Kazuhiko is breeds Ki-Utsuri, Koromo, Doitsu Sanke, Doitsu Showa, Hikarimono, and several Kawairgoi varieties. He raises around 10-15,000 tosai each year, and raises around 1,000 nisai each year. His raising ponds number around 50, with a total area of approx. 20,000 m2