Full Breakdown
Giant Lion’s Mane Jellyfish Appears Off Pembrokeshire Coast
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The Sighting
A swimmer identified only as Morgan reported encountering an unusually large jellyfish while near Trefin Beach in Pembrokeshire. Morgan initially thought the animal might be a native compass jellyfish but realized it was far larger than any species normally seen in UK waters.
Background on Lion’s Mane Jellyfish
The creature Morgan filmed is a lion’s mane jellyfish, a species known for its exceptionally long tentacles. The Wildlife Trusts explain that the jellyfish can reach a bell diameter of up to 3 m (9 ft 8 in), while its tentacles may extend 30 m to 36.5 m (98 ft 4 in to 119 ft 8 in), making it one of the longest animals on Earth.
Expert and Conservationist Comments
Marine biologist Dr Cathy Lucas of the University of Southampton noted that the video clearly shows the animal’s extraordinary length. She recalled similar encounters in Scotland where divers collected stray tentacle fragments even when no jellyfish were present, emphasizing that broken pieces can still deliver a sting.
Size and Stinging Details
This impression aligns with the known maximum dimensions of lion’s mane jellyfish. While the sting can cause painful reactions, experts say it does not pose a serious health risk to healthy individuals.
Verbatim Quotes
- “It must have been the length of a bus or small train. I couldn't believe how big it was.” — The Wildlife Trusts — The Wildlife Trusts