• Box jellyfish are found primarily close to the coast, but Irukandji jellyfish are found on reefs and islands as well as along the coast.
• There are well over 100 species of jellyfishes that make their home in the GBR region, and all but about 10 are regarded as harmless.
• At least 10 species of jellyfish are believed to cause Irukandji syndrome, ranging from as far north as the United Kingdom and as far south as Victoria.
• All jellyfishes are animals with no bones, no brain, no heart, and no lungs or gills.
• Box jellyfish and Irukandjis have well developed eyes with lenses, retinas, and corneas, just like our eyes, and we know experimentally that they can see, even without a brain!
causing great harm to the ecosystem in the process (e.g. Mnemiopsis in the Black Sea and Phyllorhiza in the Gulf of Mexico). In other cases, serious impacts on the local biota have been caused by extreme concentrations of native species (e.g. blooms of Chrysaora in the Gulf of Alaska and Aurelia in California). Jellyfish can also be a food source for many species, such as fishes and turtles, and they are heavily fished in some parts of the world (e.g. China).
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