This is 351 cram packed pages dedicated entirely to the study of Gosanke varieties, their origins, skin quality, growth development and characteristics of their blood lines.There is excellent information on how to sex Koi, how the judging of Koi is done.Size and age related information. The insider knowledge on the methods of rearing, colour and skin quality………….Gosanke Varieties – The book goes into great detail discussing and providing photographic examples of Sahi and Kiwa, skin quality, growth and development , origins, bloodlines and body forms for all the Gosanke varieties. The comprehensive breeder sections include a detailed history and description of production values for breeders in Nagaoka, Ojiya, Uonuma, Isawa, Fukui, Hiroshima and Fukuoaka regions. Just as a taster the list contains – Maruboshi, Hoshegawa, Isa, Torazo, Shinoda,Izumiya, Hoshikin, Oomo, Maudo, Jinbei, Tanaka, Shintaro, Murata, Matsunosuke, Kachi, Sakai, Ueno and Ogata.