Marine stingers such as Irukandji jellyfish and other dangerous marine life are present, especially during the summer months, in the waters off K'gari (Fraser Island), Hervey Bay and the Great Sandy Strait.

Yes, marine stingers (dangerous jellyfish), including the highly toxic Irukandji, are present in the waters surrounding K’gari (Fraser Island), particularly during the warmer summer months from November to May. While the island is famous for its stunning beaches, the western side of the island—facing the mainland across the Great Sandy Strait—is considered a higher-risk area for these transparent, thumbnail-sized jellyfish that can cause life-threatening "Irukandji Syndrome." Because of this, as well as the presence of strong currents and sharks, swimming in the ocean around K’gari is generally discouraged. In 2026, local authorities and tour operators strongly advise visitors to stick to the island's many pristine freshwater locations, such as Lake McKenzie or Eli Creek, which are entirely stinger-free and safe for swimming. If you do choose to enter the ocean, wearing a full-body "stinger suit" is a common safety precaution, but most travelers find that the island's inland "perched lakes" provide a much safer and equally beautiful alternative for a cooling dip.