Compass jellyfish

Compass jellyfish ©Alex Mustard/2020VISION

jellyfish

Richard Burkmar

Compass jellyfish

Scientific name: Chrysaora hysoscella
It's easy to see where the compass jellyfish got its name – its brown markings look just like a compass! They may look beautiful – but they give a nasty sting so keep your distance.

Species information

Statistics

Bell: Up to 30cm across

Conservation status

Common

When to see

May to October

About

With brown marking reminiscent of a compass, this jellyfish is really quite distinctive. A summer visitor to our shores, the compass jellyfish feeds on small fish, crabs and even other jellyfish. They give a nasty sting, so if you spot them during a visit to the beach – look, but don’t touch! Once they have stung something, jellyfish often leave the tentacle behind and can continue to sting using it even when not to connected to their body.

How to identify

A translucent yellowish-white jellyfish with brown markings around the fringe and on the top of the bell. Those atop the bell resemble a compass, with V shapes radiating out from a central point. They have a bunch of frilled oral arms below the bell and long thin marginal tentacles around the fringe of the bell.
Don't get too close to those tentacles though, they give a nasty sting.

Distribution

Common off Southern and Western coasts of Britain in summer months.

Did you know?

Young fish can often be seen swimming around the compass jellyfish's tentacles, giving them protection from predators. We're not yet sure why they don't get stung and eaten by the jellyfish though!

How people can help

If reporting jellyfish sightings to your local Wildlife Trust please provide date, location, number (and ideally a picture) information for the accurate creation of sighting records.

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Mark Hamblin/2020VISION