Jellyfish
In the tropical north of Australia there is mostly a swimming prohibiton at costal waters between November and April. You should absolutey observe this precept, because in this time Jellyfish (also called Marine Stinger or Box Jellyfish) stay in this sea waters.Most who encounter with the up to three meters long transparent tentacles of jellyfish, do not have any chance of survival because in best time respiratory paralysis occur and so most victims don't reach the redeeming strand. Mostly on popular beaches bottles with vinegar are put up. In the case of a jellyfish contact one is supposed to wash the affected place with vinegar (in no case try fresh water, because then the poison gets even more easily under the skin). After that look for help as fast as possible.
Some cities whose coasts are affected by jellyfish, have constructed jellyfish nets or built artificial lagoons, where people are able to enjoy the water in this season too. Another way to project yourself from touching the tentacles is the especially designed jellyfish suit.
Life-savers in Geelong