That goes both ways agent. If those fish were so diseased as you perceive they would be dead. keeping in mind that atlantics are far more venerable to pacific viruses that pacific stocks. As far a Atlantics reproducing well if they haven't yet given all the historical attempts then the likely hood is pretty much next to zero however like in this video there is a chance, however minimal it is I know the agent shares the same reaction. Historical Atlantic Salmon Introduction to the West Coast: http://bcsalmonfarmers.ca/wp-content/uploads/2015/04/timeline_Atlantic_salmon_Pacific-Coast.pdf More info related to escaped atlantics http://wdfw.wa.gov/publications/00922/wdfw00922.pdf "In summary, the scientific evidence indicates that escaped Atlantic salmon, due to their behavior and domestication, are not likely to compete on par with native salmon. Atlantic salmon do not appear to prey on native salmon and appear to make limitedutilization of natural food. The infectious diseases found in Atlantic salmon have originated from natural reservoirs, i.e. other fish, and are not likely to represent the threat of a new exposure to native fish."