Our animals

Common jellyfish

Common jellyfish


LatinAurelia aurita
Size30 cm
HabitatOpen sea and coasts

Not evaluated


95% water and 5% solid matter

The common jellyfish is a jellyfish. It is thus named because it consists of 95% water. Other species in this genus include sea nettles and ctenophores. Jellyfish have no brain, teeth or blood. In spite of this, they are found in almost all oceans and at all depths.

A painful sting

The jellyfish has poisonous stinging cells that sting and stick. This is how it catches its prey and defends itself against enemies. Inside the stinging cell is a hollow thread-like structure filled with poison. When an enemy touches a jellyfish, the thread is fired and it pierces the skin of the victim. A jellyfish's poison is not particularly potent. So humans can't be harmed by it.

From offspring to adult

The male fertilises the female's eggs in the water. Out of the eggs are hatched small larvae that drift along with the current. The larvae settle at the bottom and develop into polyps that resemble small sea anemones. The polyps form a stack of small jellyfish that look like plates. One by one the new small jellyfish are sent off to grow to adulthood.

Take an excursion

Everyone can catch a common jellyfish. All you need is a net and a pail. They are not good swimmers and often drift with the wind and the currents, and they often surge in towards the coast or are washed up on the beach.