I have to say that this news gives me pause. I had deluded myself into thinking that if I limited myself to quality dealers and breeders, I would have little risk of contamination.... so, no multi-month quarantine going through heat cycles at my house. Delusional, perhaps.
I hope it is just the one pond in the single greenhouse .... a carrier fish brought from outside, perhaps to be held until it could be shipped with others ... something of that sort. It would be heartbreaking if it was more intrusive. Such an incredible investment has been made in the Momotaro program and in aggregating the breeding stable, there would be a great loss to the hobby if it proves to be anything more.
....Besides, I want a Momotaro Kohaku.