Overview

• Portuguese man o' war were reported on Cornish beaches at Sennen, Crantock and Longrock, with additional finds on shores in Gwynedd and Anglesey.
• Rhosneigr Coastguard urged people to avoid touching the creatures, warning they can still deliver extremely painful stings even when washed ashore.
• Cyngor Gwynedd issued multiple alerts and asked the public to report sightings to its Maritime Office for monitoring and beach safety.
• NHS guidance advises rinsing stings with seawater, removing tentacles carefully, applying hot water where tolerable and seeking medical help for severe reactions.
• Swarms of mauve stinger jellyfish were logged on North Wales beaches, with reports of painful welts and one case leading to a secondary infection requiring antibiotics.