Atlantic salmon don't breed in our waters & don't breed with our native species. Suggesting as some have that they are invasive is hyperbole.

The earliest attempts to introduce atlantic salmon as a wild-foraging species date to 1874 in California, then 1904 in Washington State and 1905 in BC when 90,000 fry were released into the Coquitlam River, Lillooet River, and Harrison Lake on the mainland and into Campbell River, Comox Lake, Horne Lake, Nanaimo Lake, Cowichan Lake and Koksilah River on Vancouver Island. In total 200,000 Atlantic salmon eyed-eggs, fry, fingerlings and smolts were introduced into B.C. waters that year.  The bulk of releases were into the Cowichan River system. 

There have been almost continuous attempts to establish Atlantic salmon in the Pacific right up to the 1980s.  Every attempt to introduce Atlantic salmon as wild foraging and self-sustaining have failed for almost 150 years.