To play this video you need to enable JavaScript in your browser.
This video can not be played
Figure caption,Iestyn Morgan said he wants to raise awareness about the 'threats our seas are facing'
ByOscar Edwards and Paul Pigott, BBC Wales- Published42 minutes ago
A free diver has said he "couldn't believe his luck" after spotting a giant jellyfish off the Welsh coastline.
Iestyn Morgan, from Pembrokeshire, said the lion's mane was the "length of a bus" with a size of about 10 to 15 metres (32ft 8in to 49ft 2in).
The 21-year-old conservationist, who records footage for social media to raise awareness about the "threats our seas are facing", said it was the first lion's mane he had seen in Wales.
More commonly found in the colder waters off Scotland, a marine biologist said although the lion's main sting was "nasty", it was not dangerous.
Image source, Iestyn MorganImage caption, The lion's mane jellyfish was spotted near the Pembrokeshire coast
Morgan said he was swimming near Trefin Beach in Pembrokeshire when he spotted the tentacles in the water.
"Three turned to 10, and then to 20. They just kept on coming," he added.
The jellyfish was so big the tentacles went "beyond the range of visibility".
He initially thought it was a compass jellyfish, which are native to UK waters, before realising it was too big.
"It must have been the length of a bus or small train. I couldn't believe how big it was."
The Wildlife Trusts, external said the lion's mane jellyfish gets its name from its long tentacles, and have "all the beauty and bite of a lion".
They can grow up to 3m (9ft 8in) in length, but the tentacles - which are used to catch their prey - can exceed 30 to 36.5 metres (98ft 4in to 119ft 8in) making it one of the longest animals on Earth.
Marine biologist Dr Cathy Lucas, from the University of Southampton, said Morgan's video showed the animal's incredible length.
"The tentacles are so long and so fine you might not even see them," she said, recalling how during field work in Scotland divers would get bits of tentacles on them when there were no jellyfish around.
"They still sting after they break off," she said, adding that while the sting was "nasty" and "the worst in the UK", it was not dangerous.
Image source, Iestyn MorganImage caption, The lion's mane jellyfish's name comes from its long flowing tentacles
"The advice is not to touch them and if you get a bit of tentacle on your skin flick it off with a stick and wash in warm water to neutralise," she said.
Lucas said lion's manes "occasionally" reach the Welsh coast later in the summer or autumn, according to jellyfish sightings recorded by the public, but their main habitat in the UK was Scotland.
Morgan feels we should be "grateful" they were in Wales, adding they were not "big scary monsters" as some people may think.
"Your biggest problem is if you swim into them. You don't want to get stung by a lion's mane."
Morgan said he was seeing "more and more" jellyfish coming into Welsh waters as he was filming.
He said it was part of a theme in which he was noticing warm water species "becoming more abundant".
"I don't have enough summers to compare it to, but I put down a camera a few weeks ago and saw a Triggerfish, which is native to the Mediterranean," he added.
Image source, Iestyn MorganImage caption, Lion's mane tentacles can stretch to more than 30m making it one of the longest animals in the world
Morgan said creating his content has been "very rewarding" as he wanted to make aquatic environments "more accessible" to people.
But he was always conscious that he never wanted to harm the animals as part of his project.
"I don't want to turn it into something that I'm going out to hunt the animals or anything," he said.
"I just get in the water, film and swim."
Related topics
More top stories
Westminster's time is coming to an end, Welsh, Scottish, Northern Irish leaders say
- Published7 hours ago
Driver who killed Team GB triathlete to be deported
- Published11 hours ago
Nepo baby is a horrific term, says Zeta-Jones
- Published1 day ago
