Sasha sent me this...
from washington gov't website:
Hybridization - The risk of escaped Atlantic salmon hybridizing with native salmonids is low. Research has demonstrated it is very difficult, even under optimal laboratory conditions, to cross-breed between Pacific and Atlantic salmon and produce viable offspring. Should this rare event occur in the wild, the offspring would be functionally sterile and incapable of reproduction.
but, if farmed pacific salmon escapes in the pacific (or atlantic in atlantic)
This is a very interesting article. Sorry, I don't know how to make it link. I'll have to figure that out another time.