Beachgoers on the East Coast beware: lion’s mane jellyfish have been sighted in the waters off North Dublin, as DublinLive reports.

The venomous marine wildlife — which has previously prompted warnings for Dublin beaches — was recently spotted at Dollymount and in Portmarnock, where the carcass of an injured seal also washed up in recent days.

Lion’s mane jellyfish carry a painful and potentially lethal sting, even when washed up on the beach.

Two years ago a spate of incidents saw a number of swimmers hospitalised after being stung by lion’s manes in Galway Bay.