Deadly jellyfish washed up on County’s Lusty Glaze Beach. Officials have urged members of the public to stay away from any Portuguese man o ‘war that washes over the beach. The sting of the Portuguese man o ‘war is extremely painful to eat and powerful enough to kill fish and occasionally humans.

Man’s war is a colony of organisms working in symbiosis rather than an animal.

This tentclass can rise to an amazing 165 feet long, up to 50 meters.

One of the jellyfish was previously spotted near St. Agnes on 30 August.

Sam Lovett, 22, saw a poisonous creature.

He said: “I’m totally into my marine biology and marine life. So I’m sure it’s a Portuguese man’s war.

“I took some pictures and as soon as I got the hint I looked at it and it is right in the description.

“It didn’t look like a normal jellyfish, it almost looked like a blown sandwich bag, but the blue and pink gave it away.

“We were very careful around him.

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“The colony floats from the bottom of an air-filled float and has very long thin tentacles, often up to 10 meters in length, hanging down which it uses to catch fish and which can bring very powerful bites.

“Contact with a Portuguese man o’ war usually results in a very painful sting that can leave a nasty reception, bruises and sores.

“In some cases, stings can cause anaphylactic shock, and young children are particularly at risk.

“And be careful because they can bite even when they look dead on the beach, so we advise people to leave them alone and keep the animals away.

“The recommended treatment for man-war f-war stings involves rinsing the tent with saliva and rubber gloves for immediate removal, but do not rub the area that makes the bite worse.”