Tonga/Tongatapu: Fishing Pigs

This is a relatively bizarre post from Tonga – fishing pigs. Dozens if not hundreds of pigs go out into the open Pacific Ocean at low tide here in Tonga and feast on shellfish. You can actually see and hear the porkers crushing the shells with their teeth. Supposedly the meat tastes saltier (they should export it to Ukraine). Also is a shellfish eating pig kosher thru double negative?