Salmon farming isn't uncontroversial, because of pollution through chemicals in fishfeed, bacterial contamination of the seabed, and antibiotics, the consequences of which would reduce profitability if they were ever paid by the operators of the fishfarms. Plus sea-lice are a huge problem in farmed salmon, causing up to 50% mortality I understand.
I eat salmon too (which means farmed salmon, there's almost no wild salmon sold anymore), but maybe an enclosed, slow-rejuvenating area like the Beagle Channel isn't the place to put fish farms.
Salmon is way down the list of Chilean exports, though, after fruit, cellulose, chemicals, and so on.