One thing I should add is, it seems whirling disease is only present in Alberta and there are no known cases in my entire province, so it would be unlikely I would think that it could be that. The symptoms, though, seen very similar.
IIRC, Whirling disease evolved with brown trout and they have immunity to the disease by and large. Also, in RBT, stocking sized trout are not likely to get lethal infections but when they are young fry and fingerlings are very susceptible. So it probably isn't whirling disease.
On a another note ... that's a good mess of LMB. How you like them to eat?
