A barrel jellyfish in the harbour at Torquay (Image: @sk_downing Twitter) They do have stinging tentacle but, despite their size, are considered harmless to humans. Furthermore, these barrel jellyfish can detect the direction of ocean currents, despite their lack of eyes. (3) Food Thieves: According to the scientist, the Barreleye fish steals its food from the small creatures like siphonophores. 22. The project has been a success and Michelle has been able to record the life cycle of the barrel jellyfish in captivity. Also known as the cabbage head jellyfish, it’s easy to guess where these jellies get their name. To do this, our Deputy Aquarium Curator, Michelle Davis, went in search of the barrel jellyfish, Rhizostoma octopus, on a field trip to the south coast. Read More When floating, cannonball jellies take on a spherical shape with multiple, stubby oral arms peaking from underneath the red-fringed bell. According to other observers, the fish would nourish themselves inter alia sexual organs of the jellyfish-host, which would thus constitute a form of parasitism. (2) Capability to Stay Still: The Barreleye fish can stay motionless that means it stuck in the deep sea and hold its pressure easily.This quality helps them to stay alive in the hard deep sea pressure. The life cycle of the jellyfish. 10 Different Types of Jellyfish. Cannonball Jellyfish - Stomolophus meleagris. Barrel Jellyfish can sting humans and most encounters can cause temporary pain and local redness. Scientists have actually examined the stomachs of this fish and found remains of cnidarian animals (a phylum with over 10,000 animal species) and jellyfish. Many people think of jellyfish as some of the smallest animals found in the ocean, but they really do come in all different sizes.Currently, around 2000 jellyfish types have been documented, but scientists estimate that there could still be over 300,000 species yet to be discovered.That’s a lot of jellies… The barrel jellyfish is most often seen off the coast of the southwestern British Isles, but as you may see in the news from time to time, marine animals have a habit of turning up anywhere! But of other authors make state of a cleaning of the jellyfish by alevins, which directs the relation towards a symbiosis. A giant barrel jellyfish the size of a human was captured on camera off the south-western coast of England, and served as the perfect grand finale … A pair of divers photographed their experience swimming with a Life cycle of the barrel jellyfish can detect the direction of ocean currents, despite their lack eyes! 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