My comment is obviously largely tongue in cheek.

Case in point in ~10 generations mostly unmolested these fish have proliferated and established life histories and age classes thought to be largely extinct here in the PNW.

Sure seems as though the habitat and climate arguments may not be the primary driver for size and abundance decreases here at home.

Maybe if we stopped killing all the fish and sending them to Costco in New Mexico they would have a chance to grow up and spawn in what habitat we do have available.