Science is also saying that many systems are grossly underescaped. An ongoing study in a pristine watershed in AK that appears to have never been logged shows that, in the absence of any pink salmon spawning the coho Catch (at 60% harvest rate) is about 1,000. At googobs of pinks the Catch (again at 60% hatvest) is 5-8,000. That suggests to me that productivity in the most "perfect, functional" habitat we have is controlled by the escapement level of other salmon species.

Ergo, you can "fix" the habitat but without a full complement of spawning anadromous fish the productivity will be low.

This science is out there, hase been in the literature since the mid-90s at least (the first mention was in the 20s), and is growing rapidly. It's there, but ignored.