Beachgoers and dog walkers are being urged to be careful where they walk after two Portuguese Man O' War jellyfish were found in St. Ouen's Bay.
Islanders are being asked to report any sightings but not to touch the jellyfish-like creatures as their sting can be painful.
The Portuguese Man O' War is a blue-purple marine animal, similar in appearance to a jellyfish, called a siphonophore.
Also known as 'floating terror', its tentacles can cause a painful sting which can be fatal in very rare cases.
Stings can occur in the water but also on land when the Man O' War washes up on beaches.
The Coastguard raised the alarm yesterday, and the Government reiterated the warning this morning.
"Islanders are being reminded not to touch them and that the stings can be particularly painful. If stung, vinegar can be used to help remove tentacles. Dog owners should also keep an extra close watch on their dogs at this time," a spokesperson said.
"For further advice, or to report a sighting of a Portuguese Man O’War, islanders can contact Environment and Consumer Protection on 01534 445808. Dial 999 if someone needs emergency help."
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