Miss. Code Ann. § 49-15-7

All shells of dead oysters, clams and other shellfish; and all of the oyster shells, clam shells, mussel shells, dead reef shells, and cay shells, being upon or under the bottom of, or under the tidewaters within the territorial jurisdiction of the State of Mississippi, and all beds, banks and accumulations of such shells within such territorial jurisdiction on or under the bottoms of such waters, or surrounded by such waters, being the property of the State of Mississippi are hereby further declared to be the property of the State of Mississippi under the jurisdiction of the department.