A mega swarm of giant jellyfish has washed ashore on Pembrokeshire beaches stopping visitors and locals alike in their tracks.

Western Telegraph: Jellyfish megaswarm at Freshwater East. PIC: Gareth Davies Hidden PembrokeshireJellyfish megaswarm at Freshwater East. PIC: Gareth Davies Hidden Pembrokeshire

The swarm of barrel jellyfish washed in at Freshwater West yesterday afternoon. Other sightings have taken place in Tenby, Saundersfoot, Ceredigion and Newport.

Experts have declared the jellyfish strandings a phenomenon due to the size of the creatures and the sheer number of them.

Western Telegraph: Jellyfish megaswarm at Freshwater East. PIC: Gareth Davies Hidden PembrokeshireJellyfish megaswarm at Freshwater East. PIC: Gareth Davies Hidden Pembrokeshire

It is thought that the supersize jellies may have been caused by milder winters- these have led to an abundance of plankton, the animals’ main food source.

Jellyfish themselves are the main food source for leather back turtles, sometimes spotted in Pembrokeshire waters. Conservationists are waiting with baited breath to see if these will follow to feast on the mega swarm.

Western Telegraph: Jellyfish megaswarm at Freshwater East. PIC: Gareth Davies Hidden PembrokeshireJellyfish megaswarm at Freshwater East. PIC: Gareth Davies Hidden Pembrokeshire

Members of the public are being advised not to move the jellyfish, they are relatively harmless but can sting and cause a nettle type rash.

All pictures: Gareth Davies/ Hidden Pembrokeshire. Video Lloyd Jones/ Kraken