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Due to the impact of Covid-19 (Coronavirus), the Pembrokeshire Coast National Park Authority has closed its headquarters, visitor attractions (Carew Castle, Castell Henllys and Oriel y Parc), its car parks and sections of the Pembrokeshire Coast Path until further notice. All meetings and events are cancelled until further notice. If you have any queries please call 01646 624800 or email

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Home » Learning About » Information and Resources » Wildlife » Seasonal Wildlife » Ocean Visitors » Jellyfish


Brought by the ocean currents that bathe Pembrokeshire in a mild maritime climate, jellyfish are regular visitors to the coast during the summer months. Five main species can be seen; the barrel jellyfish, the lion’s mane jellyfish, the moon jellyfish, the compass jellyfish and the blue jellyfish. 

Moon jellyfish are a common species to see. They are the jellyfish most often seen washed up on beaches during the early summer; a round disk the size of a saucer or tea plate with four pale purple circles in the centre. They have a mild sting. 

Larger, but completely harmless is the barrel jellyfish, one of the largest species found in the UK. This jellyfish also washes up dead on beaches, and is mostly found in South Pembrokeshire off the coast at Stackpole. 

Following in the wake of the jellyfish are the creatures that feed on them. Thought of as creatures of tropical waters, turtles enjoy a dinner of jellyfish and are regular visitors to the Pembrokeshire coast. The most common turtle species seen in these waters is the leatherback turtle, a reptile that can grow to 6 feet in length. Other turtle visitors include the loggerhead, kemp ridley and hawksbill turtle.