Can a Dead Jellyfish Sting You?

Jellyfish can still sting days or even weeks after they die. This is because the stinging parts, called nematocysts or cnidocysts, remain active long after the jellyfish dies and can still be triggered by pressure. Even broken pieces of a jellyfish can sting — in 2010, bits of one dead lion's mane jellyfish stung 100-125 people. There are about 2,000 species of jellyfish, but only about 100 are dangerous to humans or other animals.

More facts about jellyfish:

• It's thought that jellyfish have been around for more than 500 million years, and they exist in every ocean on Earth.


• A group of jellyfish is called a bloom, a swarm or a smack.


• Vinegar and salt water are the best for treating a jellyfish sting. Fresh water, rubbing alcohol and urine can cause additional discharge from the nematocysts.

Frequently Asked Questions

Can a dead jellyfish still sting you?

Yes, a dead jellyfish can still sting you. Jellyfish tentacles contain stinging cells called nematocysts that can remain active even after the jellyfish has died. These cells can be triggered by pressure or chemical cues, causing them to release their venomous barbs.

How long after a jellyfish dies can it sting?

A dead jellyfish can sting for several weeks after its death. The nematocysts, or stinging cells, do not die immediately and can be set off by contact for a considerable time until they disintegrate or are no longer functional.

What should I do if I get stung by a dead jellyfish?

If you get stung by a dead jellyfish, rinse the affected area with vinegar to neutralize the stinging cells and remove any tentacles with a pair of tweezers. Seek medical attention if you experience severe pain, difficulty breathing, or other systemic symptoms, as jellyfish stings can sometimes cause serious reactions.

Are some jellyfish more likely to sting after death than others?

While all jellyfish have the potential to sting after death, some species may pose a greater risk. For example, the box jellyfish is known for its potent venom and can pose a danger even after it has died. It's always wise to exercise caution around any jellyfish, dead or alive.

Can jellyfish stings be harmful to children or pets?

Jellyfish stings can be particularly harmful to children and pets due to their smaller body size and potential for a more intense reaction. It's important to supervise children and pets on beaches where jellyfish are common and to seek veterinary or medical care if they are stung.

How can I avoid getting stung by a dead jellyfish?

To avoid getting stung by a dead jellyfish, always watch where you step on the beach, especially in areas where jellyfish are known to wash ashore. Wear protective footwear and avoid handling jellyfish, even if they appear to be dead. Stay informed about local jellyfish populations and heed any warnings posted at beaches.