It would be interesting to know the impact of marine mammal protection and population growth in all this.
Also, not to pick a fight, but what evidence is there that the tribes had any kind of approach other than "catch every fish you can, salt and smoke for storage" ? I mean, was there a quota ? A management plan ? Tags ? Bag limits ?
The thing that kept the tribes from doing what the white man did was a lack of technology and industrial base/development, near as I can tell.