Now imagine seeing this giant barrel jellyfish off the coast of Cornwall in the UK.Barrel jellyfish are the largest jellyfish found in the Atlantic Ocean, and this one was even more imposing than its brethren. Indeed, one of the (if not "the") most venomous jellyfish is also one of the smallest species, the tiny Irukandji (for more on them, see the linked articles "the most venomous jellyfish"). BBC wildlife host and biologist Lizzie Daly swam subsequent to an enormous jellyfish that seemed to be as massive as her physique. A giant barrel jellyfish has been spotted off the coast of Cornwall by divers. Wareham-based wildlife photographer and author Steve Trewhella thinks unseasonable weather in April may have something to do with the jellyfish returning earlier than usual. The Moon Jellyfish Sea monsters or gentle giants? The sting of the barrel jellyfish is not normally harmful to humans, though if you find one on the beach it's best not to handle it as they can still sting when dead. Moon jellyfish are about 10 inches (25cm) in diameter but can grow a bit bigger. Despite its terrifying demeanour in the footage, Barrel jellyfish are not dangerous to humans. Similar to the barrel jellyfish, their stings are relatively harmless to humans, with most encounters causing temporary pain and localized redness. SWNS The sting of the barrel jellyfish is not harmful to humans This striking picture shows a diver off the British coast swimming alongside a barrel jellyfish that was almost the same size as him. Usually, seeing one or two small jellyfish is enough to keep you out of the water for a while. Jellyfish as Big as Humans Spotted by Divers in UK, View Stunning Pic of Barrel Jellyfish Recently divers swimming in Cornwall's oceans came across a huge jellyfish, as big as the human body. Underwater cinematographer Dan Abbott and wildlife biologist Lizzie Daly discovered the rare, enormous barrel jellyfish off the coast of Cornwall in the U.K., Vice reported, and quickly shared their film with the world.The duo was out in the water for Wild Ocean Week, a project Daly started to inspire people to give to the Marine Conservation Society. A video of the jellyfish, taken by Daly’s underwater cinematographer, […] Over the past six years, the barrel jellyfish (Rhizostoma pulmo) blooms in the Mediterranean have become increasingly common. The biggest found specimen had a bell with a diameter of 2.3 metres (7 ft 6 in) and tentacles 34 m (112 ft) long. Of those that do sting, very few are dangerous to human beings. Barrel jellyfish. It is very small, only usually growing around 16 inches. Barrel jellyfish could, in fact, be good for ecosystems: they are a food source for both endangered leatherback turtles and sunfish. The former is a small stalk that attaches to a rock and divides into buds which break free to become adults. The jellyfish have eight arms, which are frilly in appearance. These illnesses could potentially make their way to other marine animals or even humans. Though in recent years the rhopilema nomadica—a species native to the Indian Ocean and parts of the Pacific—has become more common. In summer and autumn they may swarm off the coast, sometimes washing up in large numbers. Several jellyfish visit UK waters. Giant Barrel Jellyfish is as big as human. They are colourless with hollow tentacles but can have pink, yellow, purplish or even red rings. Close. 422. This record size makes it the longest living animal known to this day, surpassing the Blue Whale. A giant barrel jellyfish, similar to the size of a human, was spotted off the coast of Cornwall by biologist and wildlife presenter Lizzie Daly. 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