While scuba diving off the south-west coast of England this summer, I was lucky to encounter several different species of jellyfish in just a matter of weeks. Many of these, including the compass jellyfish (Chrysaora hysoscella), are already common to UK waters. But among them was one that I had never laid eyes on before—the crystal jelly (Aequorea victoria)—a creature capable of glowing in the dark.
As the waters surrounding the UK continue to warm, it's possible that people will have even more of an opportunity to watch and admire these diverse and strange animals.
This species is often the most commonly reported jellyfish in UK waters. In 2022, almost one-quarter of the UK jellyfish sightings that were reported to the Marine Conservation Society were compass jellies. Compass jellyfish have a very painful sting. have a distinctive appearance. They have relatively short tentacles and are transparent with four purple rings on the top of their bells. They can grow to 40cm in diameter.. Moon jellies have only a mild sting that most people don't react to.
Their bell is thick and can be light pink, blue or yellow, but it is usually rimmed with dark purple. Instead of tentacles, barrel jellies have long frilly arms. Due to their size, only young lion's mane jellies are eaten by fish and turtles. Lion's mane jellyfish have a painful sting. are small—less than 10cm in diameter—and a beautiful pink or mauve color. They glow in the dark and can form aggregations, known as a"smack," that are so large they can clog fishing nets.
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