In the spring, the Striped Bass enters freshwater, traveling up rivers to spawn. When spawned, fertilized eggs must have a volume and flow of water that insures at least 48 hours flotation. If they sink, the eggs die. Once hatched the fry begin their journey down river and enter saltwater as fingerlings, juvenile fish. In South Carolina, the striped bass tend to spend the greater part of its life in freshwater streams. Once it was believed that the Santee-Cooper population of Striped Bass had become landlocked because of the construction of two dams that impounded Lake Moultrie and Lake Marion. More recently, fish biologists have come to believe that the Striped Bass in South Carolina were functionally landlocked or riverene long before the dams were built. This means that they have become residents of the river naturally. This is supported by the current research. Therefore, the Santee-Cooper Striped Bass population is entirely a freshwater population (Campbell, Striped White & Hybrid Bass in South Carolina).
source for quote: http://www.spart5.k12.sc.us/techtraining/teacher/webpages/SCFish/sc_striped_bass.htm
I do know that Morone saxatilis have been stocked in many southern reservoirs that have deep enough water to support these fish. I find the Santee-Cooper story fascinating. The story has had my interest for many years. Not sure where biologists now stand on the issue but fun to think about in any case.