Which jellyfish are common in UK waters and are any of them dangerous?

There are thousands of species of jellyfish around the world, but only six are common in UK waters. You may catch a glimpse of these jellyfish in UK waters during various times of the year. While there aren't any jellyfish in UK waters that are as dangerous as the box jellyfish, which is found in Australia, there are some that can give you a nasty sting.

It is important to remain cautious when swimming in the ocean and avoid jellyfish where possible. Vets also warn dog owners to keep their four-legged friends away from them at all times, even if the jellyfish is dead as they still have the ability to sting for several weeks. Jellyfish found in UK waters - are any of them dangerous? The six jellyfish commonly found in UK waters are: Moon jellyfish Moon jellyfish are the most common species found in UK waters.

(Image: Getty Images) The Moon jellyfish is the "most common" jellyfish found in UK seas, according to The Wildlife Trusts, usually appearing during the winter months. It resembles a moon in appearance and is roughly the size of a dinner plate with four distinctive circles on its white milky dome. It also has short, delicate tentacles.

It lives for around six months and can usually be seen floating just below the surface of the water. Barrel jellyfish The barrel jellyfish is one of the largest found in UK waters, the Wildlife Trusts continued. They are usually found washed up on UK beaches in May and June.

They are translucent with a huge mushroom shaped bell, with a viol.