I think the only way to save the resource is for commercial fishermen to go the way of market hunters. By the time market hunting was outlawed, the Buffalo were all but wiped out along with many waterfowl stocks. Salmon being out of site, the stocks would probably be gone before the general public noticed.

That would also take a lot of people accepting aquaculture as their fish source. I don't see that happening as long as a vocal and vested group is out their convincing people their $60/lb troll caught fish is healthier than their $10/lb farmed fish.