Box jellyfish (Chironex fleckeri) have been spotted near the Gladstone Marina, while their smaller, but just as deadly relatives the Irukandji jellyfish, are also known to inhabit local waters. The warning comes as cyclone Niran whips up seas along the Capricorn Coast, with the potential of transporting jellyfish closer to shore. Identified by their large, cube shaped body, box jellyfish have been involved in at least 70 deaths in Australia. Medical Services Director Torres and Cape Hospital and Health Service, Dr Marlow Coates, warned against swimming in waters inhabited by the jellyfish. If you don t have a protective suit and you know there could be stingers or jellyfish in the water, just don t go in, he said.