It's easy to bring the fish back.

Remove all politics from fishing
Stop all non-selective fishing of all types
Restore habitat & watersheds to original condition
Stop pumping raw sewage into PS and along the coast
Eliminate WW plastic pollution and specifically micro plastics
Eliminate all 2 stroke engines
Specifically treat all water to remove all traced of pharmaceuticals
Manage pinniped populations
Tear down all damns and redesign the Hood canal floating bridge
Tax Alaska & Canada for stealing our fish
Stop selling wild caught fish in all US markets as was done with market hunting 100 years ago
Plant fish
Let fish return to spawning grounds

Did I miss anything?

See? Should be easy! We can probably have that done by end of day today and be fishing again over huge returns by this time next week.
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“If the military were fighting for our freedom, they would be storming Capitol Hill”. – FleaFlickr02