I assume that it is Shawn shopping in Japan, but I think Bill is a member here on the board so perhaphs he can chime in with the answer to who the breeders are.
In case you do read this Bill I have a second question. That is these are all very good looking fish , but they are for the most part not go-sanke (at least the ones pictured). Do you tend to buy more hikari an kiwari types becuase that is what sells better here. I see that these are obviously not your regular pond grade fish here, and I am sure they are not cheap. So are people just willing to pay more for higher level non gosanke than they are for good go-sanke in your (my) area?