A number of Portuguese men o’war, which have a large gas bladder with long blue tentacles, were spotted in St Ouen’s Bay and Grève de Lecq this week.
Francis Binney, a marine scientist with the government Marine and Fisheries Resources Panel, says that their stings can be ‘extremely painful’.
‘The main advice is not to touch them and if they are in a bad position then let the Growth, Housing and Environment Department know,’ he said.
‘While they should be dead, their stinging cells could still work, so do not touch them and make sure your dogs do not touch them either.’
Mr Binney added: ‘Where you have one you tend to have a few, as they are wind driven. They have probably become broken up and washed inshore by the weather that we have been having.’
The number of recent sightings of the creature pale in comparison to the number seen on 15 November 2017.
On that date more than 100 Portuguese men o’war – which are not jellyfish but marine hydrozoans – were found around the Island.