Sibsey Island is an island in the Australian state of South Australia located in the Sir Joseph Banks Group in Spencer Gulf. It was discovered on 21 February 1802 by Matthew Flinders. In modern times, the island is uninhabited.[verification needed]
There are two anchorages on the island, one on the western side of the island, and another on the east. The nearest island within the Sir Joseph Banks Group is English Island. There is a navigational aid located on 2m high pile on the island’s highest point, i.e. 26m above sea level. Dangerous Reef, a nearby reef, makes approaching the island in large craft hazardous. [clarification needed]
Australian sea lions from nearby English Island are often seen on the rocks near to Sibsey. Seabirds nest on the island, but there are no other large animals present. Marine predators often hunt in the channel between Sibsey and English Islands. The island is part of the Sir Joseph Banks Islands Important Bird Area, identified as such by BirdLife International because of its importance as a breeding site for seabirds and for Cape Barren geese. Guano was collected from the island in the early 20th century. One party to the island circa 1916 left two members on the island for twelve days, during which time they survived by eating little penguins and their eggs. In 2004, „few“ little penguins were present on Sibsey Island. As of 2011, the colony’s status is unknown.
The island has no native economy, being uninhabited. However, the waters surrounding it are used extensively by recreational fishermen. The nearby Dangerous Reef is also a popular tourism spot, with scuba diving operators taking advantage of the natural formations and fish stocks.[verification needed] It is a significant bird, sea lion and great white shark breeding area. The area is also covered under the Lower Eyre Peninsula Aquaculture Policy.