Closed containment is already used to raise them to a certain size. I believe that is correct and then they're put into the pens. Closed containment also costs a lot of money. It uses a lot of energy. However, it would probably deal with many of the risks to wild salmon, just because there wouldn't be any contact anymore. It would be logical to assume that, if they were being farmed and there was no interaction with either the ocean floor or any other wild species, including wild salmon, that most of those risks would disappear.
On October 23rd, 2018. See this statement in context.