Bruce King is putting all this into practice, feeding his pigs unwanted wild-caught pacific salmon.
I'm willing to bet that Bruce tried eating some of the salmon himself. It is looks hard to resist.
... They like skin-on fillets better than the skin-off. They'll dig through a pile of fish and eat all of the salmon before they eat any of the other types of fish...That's one funny thing about pigs and other animals. They've always got preferences. You can witness that behavior pretty much anytime you put down a variety of food - like Mangalitsa bacon. People will typically eat their favorite until it is gone, and then move on to their next favorite.