That is assuming that salmon are the only food fish. It is a fairly low quality fish anyways. The fats are really the only good thing about them and not the only source, plus they are a mediocre tasting fish. In the north pacific: cod, ling cod, pollack, sole, flounder and especially halibut are all superior fishes.
Mismanagement is horrifying, especially in Washington state where, despite a record low run where they ended up curtailing the recreational fishery substantially, they allowed gill nets in the Columbia river from both commercial fishing and the tribes. At this point the only way to save it is to ban all salmon fishing in the rivers and off the coast for 5 years and spend that time coming up with reasonable and sustainable rules. The governor is too cowardly to do it and the commercial fishermen are too short sighted to support it, and the tribes will not agree and we will all lose.
The idiocy is stunning, the commercial fisherman will give up all of their future earnings for a few dollars today. Their myopia is truly remarkable.