Wild Atlantic salmon of course spend part of their life in salt water and they are certainly a true migratory fish. They spend part of their early life cycle in fresh water. Anything that impacts the watersheds, the freshwater component of their life cycle, or that impacts the oceans is impacting the Atlantic salmon. The list is long. When it comes to fresh water the issues are mostly land use and the inputs from sedimentation from farming or chemical inputs from farming or fish passage issues through the culverts or dams. When it comes to the ocean we're not quite as clear on what's going on. We know that the ocean survival of Atlantic salmon and that component of the life cycle has been reduced over the last couple of decades.
On May 29th, 2012. See this statement in context.