"Feeding the world" while "preserving the wild salmon stocks" using the "the most stringent regulatory environment in the world for aquaculture" seems to be the stock PR speaking notes from the fish farm PR firms (Patrick Moore and the BCSFA)."Furthermore, fish used to feed other fish are often sourced in the waters of developing countries, which puts pressure on their fish stocks and reduces locals' access to fresh seafood. In general, these food-insecure communities are also denied access to final aquaculture products because most of those products are exported to developed countries."
This is what I've always said was the falicy with the fish farmer's argument of feeding a hungry world.
"...by farming salmon, we are adding to the supply of seafood and helping to meet the market demand without over-‐stressing wild sources. "
http://bcsalmonfarmers.ca/wp-content/uploads/2015/01/BCSFA_FAQs_Growing.pdf