They can be found in all the seas and oceans of the world at every level of the water, from the surface to the very depths. Moon jellyfish (Aurelia aurita) – it has four white rings. Some people love them, the way they elegantly move through the water, the beautiful colours, the different varieties that visit UK shores and how they arrive in large blooms as summer arrives. Below … Barrel Jellyfish . This year, the charity has teamed up with the University of Plymouth to test the public's identification skills by launching an online Jellyfish ID Quiz, to help improve the survey by analysing how easy it is for people to identify the eight species of jellyfish or jellyfish-like creatures that are found in UK waters. But not all jellyfish are stinging; many are harmless to humans, but it is always best to avoid touching them. They are solid-looking jellies, even when beached but, despite their impressive size and mass, their sting is thought to be generally harmless to humans. On occasion, these have included swarms. Lion’s mane jellyfish is the largest known species of jellyfish. Photo by Pro Image Photography on Unsplash The UK Jellyfish Survey. Click on the illustrations of each individual jellyfish to learn more about the respective species. 02nd August, 2017. These are the six most common types of jellyfish found in UK waters, according to The Marine Biological Association 1. ... See Dorset's jellyfish on this downloadable guide. Jellyfish are a bit like Marmite of the swimming world. Jellyfish are amongst the most spectacular marine species in the world. Guide to Jellyfish in the UK Over the last few years the number of jellyfish present in UK waters has increased dramatically, especially in the warmer waters around the south west of the British Isles. Barrel Jellyfish (Rhizostoma Pulmo) The largest of the species found in UK waters, Barrel Jellyfish are off white in colour with purple lobes around their edges and can reach over a metre in diameter. Eight jellyfish species have been recorded throughout Dorset with frequent sightings of the compass, moon, blue and barrel jellyfish in the spring and summer. Here is a mini-guide to the main jellyfish species and the most recognizable gelatinous plankton species prevalent in our seas. The UK has six species of true jellyfish and two species of jellyfish-like animals, the Portuguese man o'war and by-the-wind-sailor, which are both classified as siphonophores. These are also called Dustbin Lid Jellyfish as they are often about that size in UK waters. They are known to actively swim away from movement in the water, so are likely to avoid swimmers. 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