tower from the Port Adelaide Entrance light was relocated to South Neptune Island. That was eventually replaced by a small brick tower in 1985, and the old tower was transported to Port Adelaide on to become part of the collection of the South Australian Maritime Museum, which opened in 1986. The new lighthouse was converted to automatic operation in 1990 resulting in the departure of the lighthouse keepers and their families. Located on the largest island in the southern group, a light mounted on a tower commenced operation in 1983. It was removed in 2002-2003. Climate Neptune Island has a Mediterranean Climate (Csb) with mild summers and cool winters. The island gets only 45.6 clear days annually. Coastal weather observations have been obtained by the Australian Bureau of Meteorology at the South Neptune Islands since 1957. Initially, observations were made by the lighthouse keepers residing on the Island at three hourly intervals. As of 2014, observations are made via an automatic weather station (AWS). Economic activity Guano The Neptune Islands were one of the island sites from which guano was mined under licence from the South Australian Government prior to 1919. Fishing The waters around the Neptune Islands outside of the protected area (see below) are commercially fished for abalone, marine scalefish, rock lobster and sardine. Bycatch includes commercially attractive species such as giant crab and octopus. Tourism and other spin-offs Despite their remoteness, the Neptune Islands are regarded as one of South Australia's best scuba diving sites, specifically for the viewing of Great white sharks. The Neptune Islands, particularly the North Neptune Islands, has been a shark cage diving destination since the late 1970s. Since 2002, it is the only site within Australia where this activity is legally permitted. Cage diving charters have attracted professional photographers and others whose efforts are considered by individuals such as Rodney Fox as having "significantly contributed to worldwide knowledge of shark physiology and behavior, because film, video, television and print media associated with shark viewing and research activities at the Neptune Islands, have reached a very large global audience". Other tourist activities include charter fishing, marine mammal watching and cruise ship visits. Protected areas Neptune Islands Conservation Park The Neptune Islands Conservation Park includes all the islands in the Group and adjoining waters within of low water mark with the exception of Lighthouse Island in the South Neptune Islands and Low Rocks. The