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I think that by now the lines between wild fish and hatchery fish are so blurred as to be almost nonexistant. How many years did the state pump out unmarked hatchery fish? How many years have those hatchery fish had to 'hybridize' (if that's even an applicable term here) with wild fish? At this point, I wouldn't be surprised if every single steelhead and salmon, whether it came from the truck or the stream, were a mutt.
That just simply isn't true. It may make sense, but it's not backed up with fact. Hatchery fish may spawn with wild fish, but their offspring don't survive to spawn themselves, so the mixed genetic material isn't carried on to future generations of fish.

The main concern is that wild fish spawn unsuccessfully with hatchery fish, rather than spawning successfully with another wild fish. That takes a wild fish out of the mix.
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She was standin' alone over by the juke box, like she'd something to sell.
I said "baby, what's the goin' price?" She told me to go to hell.

Bon Scott - Shot Down in Flames