ARCHIVE: Swathes of Lion's Mane jellyfish land on Portmarnock beach as council issue warning
Cathy McElroy McMahon/ Portmarnock Community Association
Footage captured on the weekend shows large swathes of Lion's Mane jellyfish washing up on Portmarnock beach. Fingal County Council also issued a warning to bathers in the area "We have got some reports of Lions Mane Jellyfish at Malahide and Low Rock. Please exercise caution at beaches as a sting can cause nausea headaches and other symptoms". While the Lion's Mane does not live in Irish waters, it is known to frequent the cooler waters of the Irish Sea.