For instance the Chiropsella bart sting only causes moderate pain and itching. Except for a few, box jellyfish rarely pose any threat to humans. While many box jellyfish are completely harmless to humans there are few that are as deadly as the world’s powerful marine stinger. The Irukandji sting is 100 times potent than that of cobra’s and 1,000 times as powerful as that of tarantula’s sting. The sting is likely to cause brain haemorrhages. Irukandji jellyfish is known to discharge venom from the tips of their tentacles. This is probably an adaptation to prey on small fish. Other jellyfish seem to have stingers on their tentacles and not on their bell. Unlike most other jellyfish species, Irukandji jellyfish possess stingers on its bell. Irkandji jellyfish mostly live in the coastal waters. While people generally treat jellyfish venom with vinegar researchers believe that the vinegar only promotes the discharge of venom. Symptoms of the sting can last as long as 15 to 20 days. The sting itself is only moderately felt for it covers only few square centimeters but the systemic effects begin to develop 30 – 40 minutes after the injection. Soon after the victim is stung he/she must require immediate hospitalization for the syndrome may last up to 30 minutes on average. Prominent among the symptoms are unusual increase in heart rate or blood pressure, nausea, headaches, sweating, muscle numbness, chest tightness, restlessness and vomiting. The syndrome causes the extreme pain not only in kidneys and back but it also leads to the muscle cramps in legs. Irukandji jellyfish injects venom into the human body causing Irukandji syndrome. It makes habitat in the temperate waters of Florida and Australia. The smallest box jellyfish Irukandji is the world’s most venomous jellyfish.
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