Rare fluorescent sea slug found in UK waters for the first time

multi coloured sea slug on a rock

An extremely rare fluorescent sea slug has been spotted off the coast of the Isles of Scilly.  According to Cornwall Wildlife Trust and the Isles of Scilly Wildlife Trust, this is the first sighting of the species in the UK.

The multi-coloured sea slug, Babakina anadoni, measures just two centimetres in length and was captured on camera by a Seasearch volunteer Allen Murray during a dive near Melledgan, an uninhabited rock island in the Isles of Scilly, during the Wildlife Trust’s National Marine Week.

This species is a member of the aeolid nudibranch family and has only been recorded a handful of times along the West coast of Spain and further south in the Atlantic.

“We were extremely excited to hear about the sighting of this colourful nudibranch – a species that we believe has never been recorded in the UK before,” says Matt Slater, marine conservation officer at Cornwall Wildlife Trust and co-ordinator of the Seasearch programme for Cornwall and the Isles of Scilly.

“It’s one of the prettiest sea slugs I’ve seen and, given its less than half the size of your little finger, it’s amazing Allen spotted it at all. There’s still so much out there that we don’t know about our marine environment. Records like this from our Seasearch divers are vital in helping us understand and better protect our seas.”

Nudibranchs, often known as sea slugs, are soft-bodied marine animals famous for their extraordinary bright colours and striking shapes. They are much like their land-based, garden relatives and feed on seaweeds, anemones and other sea slugs.

Sea slugs can incorporate the stinging cells from their prey into their own bodies, giving them a defence against predators.

Earlier this year, the Isle of Scilly Wildlife Trust reported seeing humpback whales feeding around the islands, marking the return of humpbacks to UK waters after whaling bans.

Image courtesy of Allen Murray.

Leave a Reply

Your email address will not be published. Required fields are marked *