Out of about 300,000 fish, 5000 are estimated to have escaped.  Out of those escapees, a few (dozens maybe?) may make it to Alaska.  And people are worrying about stream crowding?  excess predation on food resources?  Get a grip.  If you want to worry, just worry about the clown in Washington destroying your government.

During the 60's, Atlantic salmon were released several times in Washing State with the hope they would establish themselves.  How many survived?  None.  Nothing ever came of this effort.  So don't worry about these long domesticated fish taking over any streams, let alone those a thousand miles away.

Lastly, these are not the "frankenfish" so mis-named by ignorant politicians.  That silly term refers only to the GMO fish which carry a king salmon and eel pout gene.  These fish are domesticated the old-fashioned way, through breeding.