The tidal rivers that flow through the salt marsh support mussels and clams as well as oysters. Oysters, common inhabitants of intertidal areas along our rivers and creeks, build reefs where small invertebrates like juvenile shrimp and larval crabs find shelter from predators.  Many fish like flounder, black sea bass and Atlantic spadefish use the reefs as nursery habitat. Other fish species come to the oyster beds to feed. Learn more about the Charleston Harbor watershed’s estuarine habitat.