Teacher and author Chloe Heuch made the surprising discovery while walking on Llanddona beach with her daughter
A volunteer collecting rubbish received quite a surprise after picking up a discarded coffee cup lid on an Anglesey beach. Upon flipping it over, she discovered it had been taken over by peculiar-looking creatures that appeared both bizarre and somewhat unsettling.
Gwynedd-based teacher and writer Chloe Heuch stumbled upon the find during a stroll along Llanddona beach with her daughter. Her initial assumption was that they were some form of sea slug. “The plastic lid was upside down in the wet sand – it looked as though it had been dropped,” she said. “I picked it up to put it in the bin not realising there were creatures inside.
“I was a bit surprised by their weirdness. My daughter touched one gently as she didn’t believe me they were alive, and it sort of shrank into itself a bit.” Read the biggest stories in Wales first by signing up to our daily newsletter here.
Keen to learn more, Chloe posted a photograph on social media. An underwater photographer quickly provided an explanation, confirming they were sea squirts, specifically Ciona intestinalis, reports North Wales Live.
“Opportunistic colonisers of almost any surface that hasn’t got something else growing on it,” he said. “They’re much prettier when expanded and filter feeding. Totally harmless but can aggregate in huge quantities.” Its Latin name translates literally to “pillar of intestines”.
Growing to lengths of up to 20cm, its cylindrical form is a translucent yellow shade that reveals its internal organs.
These squirts – commonly known as vase tunicates – settle on virtually any surface, including not just bedrock and boulders but also metal and concrete, and even algae. They form dense colonies on floating objects such as boat hulls and aquaculture equipment, as well as man-made structures like pilings.
This makes them particularly prevalent in harbours and marinas. In the UK, where populations are especially abundant, they are classified as an invasive species.
Consequently, stringent regulations exist to control their spread. Commercial fishing vessels and shellfish harvesters must inspect hulls and sanitise equipment with bleach or vinegar. Bilge water must be disinfected or disposed of on land rather than at sea.
Chloe’s instinct was to discard the plastic lid she discovered. However, being unfamiliar with the species, she couldn’t bring herself to do so.
“I left it where it was, which I felt bad about, but I didn’t want to upset them,” she said. “They did seem very happy. There were a few of them in that tiny space!”
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