They have great difficulty in labs to successfully cross Atlantic and Pacific salmon. With all the efforts over the last 150 years or so to introduce Atlantics on the Pacific Coast I don't believe there is a single established population. A few have been reported to have successfully spawned, in BC I think. But it came to nothing.

These highly domesticated Atlantics are probably the least reproductively competent cultured salmonid. Most, even, don't appear to have been very successful at feeding in the wild as the majority I have seen are rather thin.