Sea Wasp | Oceana
Home / Sea Wasp

Marine Life Encyclopedia

Corals and Other Invertebrates

Sea Wasp

Chironex Fleckeri

Distribution

Tropical and subtropical western Pacific Ocean

ECOSYSTEM/HABITAT

Coastal to open ocean (pelagic)

FEEDING HABITS

Foraging predator

TAXONOMY

Class Cubozoa (Box Jellies), Family Chirodropidae (Venomous Box Jellies)

Using these stinging cells, the sea wasp hunts small fishes and pelagic invertebrates like swimming crabs or prawns. The cnidocytes are also the source of the powerful sting, and the stories of deaths caused by the sea wasp almost always involve a person being wrapped in multiple tentacles, with stings covering much of the body.

There are multiple, cryptic species in the genus Chironex, so the exact range of the sea wasp is unknown. It is particularly common off the northern coast of Australia, where beachgoers are often stung, prompting a massive campaign by the tourism industry to install nets off of main swimming areas to keep the sea wasps out. Though their stinging tentacles provide them with a means of capturing prey, they do not provide these jellies with sufficient predator defense. They are a favorite prey of leatherback turtles and some other pelagic predators. Among the jellies, the box jellies are known for having some of the most complex eyes. Recent lab studies imply that sea wasps can discern some colors and may even be able to generate three-dimensional images, but the latter has not been confirmed, as they have no brain or central nervous system.

Like many jellies, sea wasps have an interesting life cycle that includes a combination of sexual and asexual reproduction. Sexually mature sea wasps are the jellies (known as medusae), with stinging tentacles, with which we are most familiar. These adults reproduce via external fertilization, where females release eggs and males release sperm into the water column. Once the egg is fertilized, a larva hatches and lives in the pelagic environment for some time. As it grows, the larva searches for a suitable place in shallow water and eventually attaches to the sea floor where it grows into an upside down medusa known as a polyp. During the polyp phase, an individual buds off several clones of itself that swim away as medusae and eventually grow into sexually mature sea wasps. This alternation of sexual and asexual reproduction may be a means of quickly increasing numbers while preserving the importance of mixing genes with other individuals.

Sea wasps are not eaten by people, and there is not sufficient data to determine their population trends. However, anecdotal data implies that their numbers are likely stable or increasing and that human activity is not a threat to this species’ survival.

Fun Facts About Box Jellyfish

1. Box jellyfish are one of the most venomous creatures in the world.

2. Box jellyfish do not have a brain.

3. They have barbs called nematocysts on their tentacles where venom is stored and delivered.

4. Box jellyfish have 24 eyes.

5. The body of a box jellyfish is transparent, and its tentacles are blueish gray.

Engage Youth with Sailors for the Sea

Oceana joined forces with Sailors for the Sea, an ocean conservation organization dedicated to educating and engaging the world’s boating community. Sailors for the Sea developed the KELP (Kids Environmental Lesson Plans) program to create the next generation of ocean stewards. Click here or below to download hands-on marine science activities for kids.

Kids Environmental Lesson Plans

References:

  1. Animal Diversity
  2. NOAA

Get Involved

Donate Today

SUPPORT OUR WORK TO PROTECT THE OCEANS BY GIVING TODAY

With the support of more than 1 million activists like you, we have already protected nearly 4 million square miles of ocean.

Donate Now

TAKE ACTION NOW

Support policy change for the oceans

Decision-makers need to hear from ocean lovers like you. Make your voice heard!

Sign Now

VISIT OUR ADOPTION CENTER

SYMBOLICALLY ADOPT AN ANIMAL TODAY

Visit our online store to see all the ocean animals you can symbolically adopt, either for yourself or as a gift for someone else.

Shop Today

DOWNLOAD OCEAN ACTIVITIES

HELP KIDS DISCOVER OUR BLUE PLANET

Our free KELP (Kids Environmental Lesson Plans) empower children to learn about and protect our oceans!

Learn More

FEATURED CAMPAIGN

Save the Oceans, Feed the World

We are restoring the world’s wild fish populations to serve as a sustainable source of protein for people.

Learn More

More CAMPAIGNs

Protect Habitat

Bycatch

Plastics

View All

CONTACT

Oceana International Headquarters
1025 Connecticut Avenue, Suite 200
Washington, DC 20036 USA

General Inquiries
+1(202)-833-3900
info@oceana.org

Donation Inquiries
+1(202)-996-7174
wavemaker@oceana.org

Press Inquiries
+1(202)-833-3900
press@oceana.org

OCEANA'S EFFICIENCY

BECOME A WAVEMAKER

Sign up today to get weekly updates and action alerts from Oceana.

SHOW YOUR SUPPORT WITH A DONATION

We have already protected nearly 4 million square miles of ocean and innumerable sea life - but there is still more to be done.

Donate Now

QUICK LINKS: