The oysters, from Virginia down to Texas, are the same species as our Northeastern ones but the southern ones grow faster and larger.
As a result (some readers might object), southern oysters are less delectable raw. I've had them broiled over coals with hot sauce (ok, not great) and fried (excellent - but most seafood fried is good). For me, a Po' Boy sammich is as good as a Soft-shelled Crab sammich.
Somebody told me that the best treat they had ever had was an Oyster Pie on the Virginia shore. He told me that the bottom of the pie was lined with a layer of Virginia Ham.