To thoes that think freshwater habitat is a limiting factor to wild fish production need to look at the history of Southwest Washington's Washougal river. We have an excellent example of fish having done better in the past with worse habitat than they are now with better habitat.

The first example is the Washougal where at the beginnng of the century the headwaters were a barren wateland as the result of the all comsuming Yacolt burn a devastating forest fire that burnt the entire upper watershed to the ground, not a tree left standing antwhere near the river. On top of that there was excessive gold, silver and copper mining the letal tailings of which were routinely dumped directly into the river. Add to that massive loogging on the lower river along with the operation of splash dams than choked the river with logs for miles, add to that 2 concrete dams and a grist mill that all hindered fish passage. Then on top of that the rivers mouth was a toxic cesspool from the Camas Papermill. In spite of all that the wild summer steelhead population was stable at 1500-2000 fish! It crashed in the early 1960's the exact same time hatchery operations began at the Skamania hatchery.
The yacolt burn is completely healed and the Washougals habitat is near pristine in condition and the wild steelhead are having NO hint of seriously rebounding from all time lows in the early 90's Habitat is NOT a limiting factor here, neither is harvest and neither is the ocean.
What is the one and only limiting factor? The hatchery! period thats it!