In looking at the impacts of hatchery fish genetics on wild fish I believe there is a continuom from least culture to most. Simply collecting eggs, incubating on surface water, and releasing the fry should have the least impact. Next step up is short term feeding. Beyond that is holding and feeding for a year or more. Another big impact is incubating and rearing on (generally) warmer ground and spring water.

So, the hatchery chum and pink should show the least impact while steelhead should show the most. Kinda like what we see...........