Monday, 7 October 2019

Portuguese Man o' War washing up on Cornish beaches.

A warning has been issued to bathers after a large number of Portuguese Man 'o War, Physalia physalis, were found washed up on Sennen and Portheras Cove beaches near Penzance in west Cornwall on Sunday 6 October 2019. People are being urged to be wary of both the animals themselves, and any detached tentacles, as the venom of the species is particularly potent, and can occasionally kill Humans, though children and pets are thought to be more at risk than adults. 

 A Portuguese Man 'o War, Physalia physalis Islands in the Sea 2002/NOAA/Wikimedia Commons.

Portuguese Man o' War are colonial Siphonophores only distantly related to true Jellyfish, Scyphozoa, though commonly referred to as such. Their bodies are made up of thousands of individual zooids, each with their own sting, tentacles and digestive system. New zooids are formed by budding from other members of the colony, but remain attached to these to form a single colony. Each year a generation of specialist sexual zooids (gonozoids) is produced which produce eggs and sperm, with fertilised eggs going on to form new colonies. These animals are anchored to the sea surface by a highly modified zooid which forms an air sack, filled with a mixture of carbon monoxide defused from the zooid and nitrogen, oxygen and argon from the atmosphere, which are brought into the sack through osmosis.

Portuguese Man o' War produce an extremely strong venom, for both capturing food and defending the colony, and which is capable of causing extremely painful stings, and sometimes death, in Humans, for which reason people are advised to be extremely cautious on beaches where these animals wash up, not just of entire animals but also detached tentacles, which are less visible but still capable of stinging.

See also...
Follow Sciency Thoughts on Facebook.


  1. You have used this image without permission. The copyright belongs to the Friends of Portheras Cove who put it on their twitter feed yesterday. Please remove it. Jan Dove

  2. Am so happy to share this testimony with everyone about how i got my herpes cured from Dr. Obela the godfather of herbal medicine. I had been going from one country to another for medication for 3 years just to be cured from herpes but all seems in vain, i was confused and decided to search through the Internet if i could get any news concerning herpes so i do keep searching until i visited one particular site and i saw the great testimonies from different persons testifying how Dr. Obela has cure them from herpes and other diseases and i was shock and was thinking if this is real, after a due consideration i decided to contact him with the email address I found in the posted just to give it a trial and when i contacted him he proved to me that his herbal medicine can cure me if only i believe in him, so i requested for his herbal medicine and i got it and i applied it as prescribed and after 1weeks and 3 days of application i went for a test and to my greatest shock the herpes virus has disappeared and it was just like a dream. Today I am cured from herpes am so happy and thanking God for using Dr. Obela to cure me. so if you are out there and you are suffering for herpes cure or any kind of illness kindly contact Dr. Obela through he will help you to cure that illness. you can get in touch with him via: or call/whatsapp him on this number +2347084171950.. Thanks very much DR. Obela
    he can also cure all type of disease like:
    HIV/AID .... cancer disease......e.t.c