From McMahon's link:

"Although hatchery females (N = 90 and 73 in the two consecutive years of the study) produced offspring that survived to emigrate as smolts, they produced only 4.4–7.0% the number produced per wild female (N = 11 and 10). "

And that's just surviving to the smolt stage, right? Doesn't this just further confirm that hatchery fish are terrible at reproducing in rivers? I don't understand your point.
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If every fisherman would pick up one piece of trash, we'd have cleaner rivers and more access.