Plunker.. There are other studies you need to read. You are correct there has been no identifyable gene flow from hatchery fish to wild fish in North Puget Sound. You know why?? Because when a hatchery fish and a wild fish spawn together their offspring do not survive!!!! That means ever hatchery fish that spawns with a wild fish takes that wild fish out of production!!!!!!! Thats why hatchery fish are soooooooo detrimental. Not because they interbreed but because they remove wild fish from production! It would be no different if ever wild fish that spawns with a hatchery fish were clubbed on the head before spawning.
We have excellent examples of how wild fish production can be increased sixfold in a single generation even with destroyed habitat and bad ocean conditions. The Keogh river on Vancouver Island is a success story beyond measure and shoule be used as an example of how to restore each and every whatershed and increase fishing opportunity without hatcheries...