The island was known by the local Aboriginal people as Boambilly,[2] and the current name comes from its shape, which is claimed to resemble a shark.
In 1877, Australian rules footballer and cricketer George Coulthard, while sitting in a boat anchored offshore, was pulled overboard by a large shark.
Coulthard managed to return to the boat, and his attack and escape were widely reported.
At that time it became exclusively a recreation reserve and part of the Sydney Harbour National Park.
Approved operators and a scheduled ferry service can take people to the island.