Pearl hunting used to be prevalent in the Persian Gulf region and Japan , but also occurred in other regions .
Pearl hunting is the act of recovering pearls from wild mollusks , usually oysters or mussels , in the sea or fresh water .
act   used to be prevalent in the Persian Gulf region and Japan , but also occurred in other regions .
Pearl hunting is the act of recovering pearls from wild mollusks , usually oysters or mussels , in the sea or fresh water .