At only 1 – 2cm in diameter the Irukandji may be the smallest jellyfish in the world but its tiny size doesn’t take away from a reputation as one of the most feared creatures of Tropical North Queensland’s coastal and reef waters.
But is this status really warranted? No it is not!
Read on to find out the hard facts about these mysterious creatures from the jellyfish expert Dr Lisa Ann-Gershwin.
What does this Jellyfish look like?
Depending on the jellyfish species, the length of the body can vary from 1 – 2cm for the smallest Carukia barnesi species to 15cm; although Irukandji this big are rare. The tentacles of the Carukia barnesi jellyfish at thin and can reach up to 1m long. Tiny and translucent, the Irukandji is difficult to spot while swimming, diving, or snorkelling, hence why this jellyfish can be referred to as an invisible danger.
Are these Jellyfish only found in Australia?
No, Irukandji jellyfish are found throughout the world, even in all your favourite holiday destinations such as Bali, Thailand, The Phillipines and more countries from South East Asia, to the Caribbean, Hawaii, South Africa and even the United Kingdom.
Australia has always been the leading country in scientific research efforts on Irukandji jellyfish, publishing papers and having visiting scientists from all over the world arriving on the Great Barrier Reef to study and share their findings with other researchers which is perhaps why the jellyfish is wrongly thought to only occur here.
Australia holds the oldest and most indepth records dating back to decades of research on these animals and that is why Australia has been unfairly tarnished with the reputation of being the place to find Irukandji jellyfish.
Where are they found in Australia?
Irukandji jellyfish are usually found in tropical waters, from Bundaberg to Cairns and Port Douglas in Queensland, up around the northern coastline of Australia, to Geraldton in Western Australia. They have been found as far south on the eastern coastline as Hervey Bay, but this is not common. These jellyfish can be found both in coastal and reef waters.
When is the so called ‘stinger season’?
Irukandji jellyfish are commonly referred to as marine stingers, or stingers. Experts, however, don’t encourage the commonly-used term of ‘stinger season’ when referring to the months of November to May, as it implies jellyfish stings do not occur at other times of the year. The preference is to refer to this period as the ‘high season’ or ‘peak season’ when the water temperatures are more ideal and the winds are calmer.
What are the chances of being stung by a Jellyfish on the Great Barrier Reef?
Out of the many millions of people who visit the waters of the Great Barrier Reef every year, a particularly bad year may yield around 50 - 100 Irukandji stings that require medical treatment. When you consider the size of the Australian coastline and the length of the Great Barrier Reef, this is not a large number. And while they may just have the potential to be life-threatening to a minor few, the chance of a sting is very, very low according to expert Dr Lisa-Ann Gershwin.
Read more scientific and factual information from Dr Lisa-Ann Gershwin.
How do you avoid being stung by Jellyfish on the Great Barrier Reef?
As with any beach in Australia, swim between the red and yellow flags and be sure to pay attention to any warning signs displayed. Wear a full piece lycra suit when exploring the Great Barrier Reef. Protective clothing has been instrumental in reducing the number of potential stings per annum to very low numbers - during the so called "stinger season" the snorkelling and diving tour boat operators are able to provide lycra suits for you to not only calm your mind but to also protect you from sun burn.
Is there any way to tell Irukandji Jellyfish are in the water?
Yes, there are. The tell-tale signs of the remote possibility of jellyfish in the waters include sea lice felt in the water and clusters of salps, which look like crushed glass or ice at the high tide line on the sand. Irukandji feed on this, so it’s a strong indicator they aren’t far away. Another clue is a sustained north-easterly wind. But just remember that right behind a jellyfish is a sea turtle as this is their lunch. so the more sea turtles we protect the less the jellyfish.
What is Irukandji syndrome?
While the sting itself can be mild, the symptoms – referred to as Irukanji Syndrome – can be life-threatening, however this is only in very rare cases. Symptoms can take between 5 – 45 minutes to develop after being stung and include lower backache or a headache, overall body pain, muscular cramps or shooting pains in the victim’s muscles, chest and abdomen, nausea, vomiting, breathing difficulties.
How do you treat a sting?
- Remove the victim from the water.
- Douse the sting area as quickly as possible with vinegar for at least 30 seconds but avoid rubbing the sting area.
- If vinegar is not available, carefully remove tentacles and rinse well with seawater.
- Call for medical assistance as soon as possible by dialling 000.
- While waiting for the ambulance to arrive, regularly monitor and record the victim’s pulse, breathing and conscious level. And remember, if in doubt, treat it as an Irukandji sting.
Please note: This is informational only; we are not scientists or jellyfish experts. We suggest you do your own research on the matter to enable you to make informed decisions about your own safety. Dr Lisa-Ann Gershwin is the jellyfish expert and if you are really worried you can download her Jellyfish App on Google Play and the App Store.
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