My main motive to visit the west coast of Scotland in July was to see the basking sharks that also flock to that part of Scotland. We had no luck with the sharks; but it was fascinating to see and snorkel with the large numbers of jellyfish.
A handful of different jellyfish type are found in UK waters. It was two species that we cam across in Scotland; the Lion's Mane Jellyfish and the more common Moon Jellyfish.
The Lion's Mane jellyfish that we came across were of modest size, however, these jellyfish have been known to grow to colossal sizes. A specimen found in Massachusetts Bay in 1870 was 7 feet in diameter and it's tentacles were 120 feet in length. That's longer than a blue whale! These jellyfish have a very severe sting that can even sting long after being stranded on a beach.
The second and more common was the Moon Jellyfish. These harmless (to humans) jellyfish can grow up to 40cm in diameter and are found in almost all waters of the world, although most common in the Atlantic Ocean.
Moon jellyfish are carnivorous and feed on zooplankton like these ctenophores.
It was fascinating to watch the jellyfish as they move around the water. They are only capable of producing an upwards thrust movement and are reliant on the tides and currents of the waters for any horizontal movement and to keep them suspended. It was almost hypnotic watching their movement!
Finally here is a short video taken whilst snorkelling with the jellyfish.
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