The largest known species of jellyfish has been spotted off the coast of Dublin 5 months ago

The largest known species of jellyfish has been spotted off the coast of Dublin

Warning signs for swimmers have been erected in the area on Thursday afternoon.

Dún Laoghaire-Rathdown (DLR) County Council has issued an official warning after a Lion's Mane jellyfish spotted off the dlr coast at Sandycove today (Thursday 13 June).

The Lion's Mane Jellyfish, also known as the giant jellyfish or the hair jelly, is the largest known species of jellyfish, usually found in colder waters of the Arctic, northern Atlantic, and northern Pacific Oceans.

Their tentacles can grow up to 165 feet long, and are poisonous, but while they can be extremely toxic, reports of human fatalities directly related to the Lion's Mane's sting are few and far between.

The full DLR warning statement is as follows:

"Warning Signs have been erected in the Life Guard patrolled area at Sandycove as Lion's Mane jelly fish have been spotted here and further into the bay this afternoon.

"Whilst bathing has not been prohibited, swimmers are advised to be proceed with caution. As an added precaution the life guard warning flags are on red and will remain in place till further notice.

"DLR Life Guards are actively keeping a vigilant eye on the water and bathers. Lion's Mane jelly fish can still deliver a sting when washed up on the beach and precaution should prevail when both in and out of the water. These species of jelly fish can deliver a verminous sting and may cause medical complications.

"If stung and suffer any serious symptoms including nausea, vomiting or respiratory distress you should seek medical attention immediately.

"For further information please contact the dlr Communications Office at 01 2047096 and"