Guide · Beach safety ·
Stinger season in Queensland: when and where to swim
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Stinger season in Queensland runs from November to May, and the risk is highest in the tropical north. If you are heading to the coast this summer, swim at patrolled beaches, between the red-and-yellow flags, and use a stinger net where one is provided. Stingers are in the water all year, but they are far more common in the warm, wet months.
This guide explains what a stinger is, when the season runs, what the nets do and do not stop, and how to plan a safe swim.
Sources for this section: Queensland Government, Dangerous marine life; eAtlas, Jellyfish of the Great Barrier Reef.
When is the stinger season?
The Queensland Government gives the marine stinger season as November to May. It says marine stingers are present in tropical Queensland waters all year round, but the risk is higher during these months. The eAtlas guide to Great Barrier Reef jellyfish says the same about box jellyfish: in Queensland they are mainly found in the wet season, from November to May, but can be present throughout the year.
So the dates are a guide, not a fence. A beach does not become safe on the first day of June. Treat the months either side of the season with care, and always read the signs on the day.
| Question | Short answer |
|---|---|
| When is the higher risk? | November to May |
| Where? | Tropical Queensland waters, especially the north |
| Are stingers present at other times? | Yes, they can be there all year |
| Where is it safest to swim? | At patrolled beaches, between the red-and-yellow flags |
Sources for this section: Queensland Government, Dangerous marine life; eAtlas, Jellyfish of the Great Barrier Reef.
What the stingers are
The Queensland Government names two main groups in its safety advice: the box jellyfish and the Irukandji. The eAtlas guide places both in the group called box jellyfish, or cubozoans.
The large one is Chironex fleckeri. The eAtlas guide says it has many tentacles hanging from each of the four corners of its body. Its tentacles can stretch past three metres and are almost invisible in the water. Only a few metres of tentacle need to touch a swimmer's bare skin to deliver venom that can be dangerous. Most stings happen in shallow water when the wind is light and the sea is calm.
The Irukandji are much smaller. The eAtlas guide says the bell of an adult Irukandji, Carukia barnesi, is only about 5 mm across, and the animal is almost see-through. Its sting can cause Irukandji syndrome. The guide lists the symptoms as often including severe lower back pain, muscle cramps, vomiting, restlessness and anxiety. It says Carukia barnesi has been found from Port Douglas in the north to as far south as the Whitsundays.
Sources for this section: Queensland Government, Dangerous marine life; eAtlas, Jellyfish of the Great Barrier Reef.
What stinger nets do
The Queensland Government says to swim in the stinger nets where they are provided. That is good advice, because a net gives you a barrier between you and the big box jellyfish.
A net has limits, though. The eAtlas guide says the mesh used in stinger-resistant nets in north Queensland is fine enough to keep out Chironex fleckeri, but may let Irukandji jellyfish pass through. A net is one layer of safety, not a promise. It works best when you also follow the signs and wear protection.
Nets are not at every beach. Where there is no net and a warning sign is up, stay out of the water.
Sources for this section: Queensland Government, Dangerous marine life; eAtlas, Jellyfish of the Great Barrier Reef.
How to swim safely
The Queensland Government lists these steps to prevent stings:
- Always swim at patrolled beaches, between the red-and-yellow flags.
- Look for and obey safety signs.
- Do not enter the water when a beach is closed.
- Ask the lifesavers for help and advice if you need it.
- Do not touch marine stingers washed up on the beach, because they can still sting.
- Swim in the stinger nets where they are provided.
- Consider wearing a full-body lycra suit to protect against stings.
The eAtlas guide also notes that lycra body suits can help protect against stings. A suit covers the skin that the tentacles would otherwise touch. It is not a reason to ignore signs or swim outside the flags.
Sources for this section: Queensland Government, Dangerous marine life; eAtlas, Jellyfish of the Great Barrier Reef.
If someone is stung
This is general information from official sources, not a replacement for training or advice from lifesavers and paramedics.
The Queensland Government says to dial Triple Zero (000) and ask for an ambulance. While waiting for the ambulance, pour vinegar onto the sting. Give oxygen or CPR if required. It adds that Irukandji symptoms may take 20 to 40 minutes to show, so if you are in doubt, seek medical aid.
The eAtlas guide gives similar steps for a box jellyfish sting. Call for a lifesaver, lifeguard or an ambulance straight away. Move the person out of danger when it is safe to do so. Stop them from rubbing or touching the stung area. Douse the area with household vinegar so that any stinging cells that have not fired cannot sting again.
The main point is speed. Raise the alarm first, then use the vinegar while help is on the way.
Sources for this section: Queensland Government, Dangerous marine life; eAtlas, Jellyfish of the Great Barrier Reef.
Planning your trip
You can still enjoy the Queensland coast during the season. The simplest plan is to swim only at patrolled beaches, inside a net where there is one. The aim is to know the risk and to pick the right place to swim.
Before you go, check the beach for flags, signs and lifesavers. Ask a local lifesaver what is happening that day. If you are travelling with children, set a simple rule: no one goes in the water unless an adult has seen the flags and the signs.
Rules, nets and signs can change from beach to beach and from week to week, so check the official Queensland Government page before you travel.
Sources for this section: Queensland Government, Dangerous marine life.
Sources
- Queensland Government, Dangerous marine life (marine stingers section): qld.gov.au
- eAtlas, Jellyfish of the Great Barrier Reef (Dr David Souter): eatlas.org.au