 The historical range is thought to have been from the Suwannee River on the western coast of Florida to the Mississippi River, and marine waters of the central and eastern portions of the Gulf of Mexico.Three sturgeon species in genus "Scaphirhynchus" share river territory with the Gulf sturgeon; none of these is anadromous.Visually, Gulf sturgeon are almost impossible to differentiate from Atlantic sturgeon, as the most significant morphological difference is the spleen length, which is internal.