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About. Jellyfish are invertebrates that, together with corals, gorgonians and anemones belong to a group called the cnidarians (knidé = nettle, from the Greek). This animal group has stinging cells which they use both to capture their prey and as a form of defense. These cells contain a capsule with a rolled-up filament and a poison.
An adult jellyfish is a medusa (plural: medusae ), named after Medusa, the mythological creature with snakes for hair who could turn humans to stone with a glance. After the male releases its sperm through its orifice into the water, the sperm swim into the female's orifice and fertilize the eggs.
Some jellyfish can turn back their biological clock. Jellyfish begin as a polyp, before becoming an ‘ephyra’ and then an adult ‘medusa’. But, if injured or starved, or in water which is either too hot or cold, an adult Turritopsis dohrnii can drop to the seabed and become a polyp all over again.. Box jellyfish are highly advanced
The jellyfish's immortality makes it an excellent hitchhiker, after all. Ballast water is pumped in and out of vessels like cargo and cruise ships to maintain stability. It is highly possible that immortal jellyfish get drawn in with this water and are able to survive ocean crossings thanks to their ability to reverse their life cycle when they experience stresses, such as a lack of food.
Jellyfish reproduce and move into new niches so rapidly that even within 40 years, some experts predict “regime shifts” in which jellyfish assume dominance in one marine ecosystem after another.
The Lion’s mane jellyfish, Cyanea capillata, is the largest known jellyfish. They’re found in the Arctic, North Pacific and North Atlantic oceans. They’re often seen in waters around the UK and Ireland. The lion's mane jellyfish's tentacles can reach over 30 metres in length – that’s longer than a blue whale.
22 de mar. de 2016 · In 2007, venomous jellyfish drifted into a salmon farm in Northern Ireland, killing its entire stock of 100,000 fish. On several occasions, nuclear power plants have temporarily shut down ...
