a friend of the family who works at the local supermarket fish counter told us that MOST fish from the grocery store comes in frozen, is thawed & sold as fresh. Think about it. If you live in the middle of the country, or pretty far from an ocean, how can "fresh" fish arrive?
We have local docks & have watched the commercial guys come in with scallops, swordfish, etc etc & yes they arrive on the boat on ice, but what doesn't get sold locally immediately gets flash frozen & distributed around the world. It's pretty amazing!