I wouldnt worry about the ability of farm raised Alantic Salmon to spawn in our rivers at this time. But I would be concerned with the disease they can spread. What do you think is happening to the wild Alantic Salmon in Maine, Maritime providences and the Scandinavia countries. It's the inability of wild fish to fight off the diseases and sea lice of these full of anti biotics farm fish.
Ya know that if worst comes to worst and our salmon and steelhead our fully on the verge of extinction from netting that it will be stopped by the federal goverment. But if our wild fish are defenseless against the diseases that farm raised fish create then there is nothing that anyone can do to stop the demise of our fish.
It is said that as much as 25% of the worlds bait fish are now being harvested for the use of feeding Aqua culture produce.
Unless fish farming comes ashore and treats its efluent and finds alternative food sources it may very well may do in our NW fisheries in the future.