Blue crab is from the Atlantic and Gulf areas. Dungeness is caught in the Pacific Ocean. King and snow crab are caught in the north off the coast of Canada and Alaska. Stone crab comes from Florida. Soft shell crab comes in four sizes; spiders, which are the bare legal size of 3-1/2 inches across, hotel prime at 4 to 4-1/2 inches, prime at 5-5-1/2 inches and jumbo at 6 to 7 inches across.