fishbear-  we need to get down to basics. First, the study you quote:  87% of fish in one river were PWS pinks.  How many fish we talking here?  500 fish?  50?  maybe 5 fish?  Salmon are strayers...one reason they have been so successful.  Secondly, the permitted capacity is not necessarily what is released.  And thirdly, when those fish and their wild cousins return to the inlet, they are not consuming starfish, sea anemones and small crabs, which is what this article was concerned with.  They would have basically zero impact on the life in tidal pools.