Could it be any easier to understand!
Native fish have been selected over thousands of years to their river of origin.
Hatchery fish came from who knows where?
Just release all natives or be stupid and let the fishery go to hell.
How hard is that one to figure out.
Or ask any B.C. fisherman if they would trade native stock Dean river fish (insert any B.C. river) for some stupid, return all at once to the same spot, hatchery idiot fish.