I guess it depends on your definition of native. After 100 years of hatchery plants I would guess very few or any of the “native” fish don’t have some hatchery genes in them. However, with that being said, since hatchery fish have been proven to have a much lower spawning success than wild fish it would seem that it would only take a few generations to successfully breed out most of the negative hatchery traits thereby returning you to a fish that is genetically adapted to its specific stream and could therefore be called native.