The Bahamas has banned shark fishing and prohibited the sale, import and export of shark products.
The new law, which was approved last week in the capital Nassau, will turn all 243,000 square miles of the nation's territorial waters into a shark sanctuary, bringing the Bahamas into line with Honduras, the Maldives and Palau, all of whom have already outlawed shark fishing.
Fines for flouting the new laws have also been increased from £1,900 to £3,150.
Sharks are becoming increasingly endangered because of the strong demand for their fins in Chinese cuisine.
Environmentalists claim that more than 70 million of the predators are killed each year.