Rather than outlaw commercial fishing completely Grandpa, why not go back to the way it was?
Prior to WWII no commercial fishing was aloud in the sound nor the strait. But the fear of Japenese submarines decemating the fleet they allowed fishing to take place in the safe waters of Puget Sound where the fishing vessels could be better protected.

Not sure if the big wig fat cats have heard but we won the war.......59 years ago! Make the strait and the sound "safe" zones again for salmon and steelhead.....and shrimp Aunty. Push the comercial fleets out to sea.