Flea is hitting the fear the Tribes have always had with selective fishing by recs. The better one faction (commercial/rec/tributary) is able to cleanly harvest, the less opportunity is available for the folks who are less selective.

Say, just as a for instance, that every Chinook hatchery in WA returned fish to specific streams where there was no concern for the wild fish. A fishery in that stream is, then 100% clean and can can take every surplus fish. The ideal fishery being a trap where broodstock is retained and the other fish available for consumption. Hard, then, to argue for mixed stock fisheries where there is all sorts of incidental mortality unless those stocks can take it. This is, of course, a very extreme example unless you happen to be talking about Baker Sockeye.