[vpeters25]

Based on what happened in the south of Chile, I think they might want to wait a couple more decades before claiming escaped salmon didn't gain finhold in the wild:

My uncle was among the pioneers of salmon farming in the south of Chile on the early 70s. A storm destroyed their first farm causing salmon to escape to the ocean. The escaped salmon (chinook) started showing back in noticeable numbers just around 10 years ago.

[mcguire]

OTOH, up until 1991, they were trying to deliberately introduce Atlantic salmon.