Venomous jellyfish have been spotted on the coast of Valencia in Spain, forcing authorities to raise the yellow flag.

An increased presence of the jellyfish has been reported over the last few days at the beaches in and surrounding the city of Valencia, capital of the eastern Spanish province of the same name.

In a clip recorded by a brave bodyboarder, dozens of large jellyfish pulse beneath the waves.

The camera goes around at a 360 angle and it is clear that the bodyboarder is surrounded by jellyfish in every direction.

But the huge presence of jellyfish has caused anxiety in most bathers who are scared to swim in the sea for fear of touching them or being stung, according to national news station Cope.

The Red Cross also raised the yellow flag due to the high number of jellyfish, which means swim with caution.

They were identified as the Rhizostoma Pulmo, known as the barrel jellyfish, which is whitish in colour, large and has purple edges.

Barrel jellyfish are the largest species found in the Mediterranean and typically reach up to 40 cm (16 in) in diameter, but can reach 1.5 m (59 in) across or larger.

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It gives a sting that causes a slight irritation that disappears quickly in the water and is not especially dangerous.

People with more sensitive skin may sometimes notice pain for a longer time.

In the UK, they are known as "dustbin-lid jellyfish" because they reach the size of dustbin lids.

The head of the Mediterranean and Jellyfish area at the Oceanografic Centre, Miguel Candelas, reported to Cope: "Jellyfish are planktonic organisms that are carried away by currents, that is, they are not capable of swimming against the current.

"In fact, the name 'plankton' comes from the Greek, which means 'drift’."

The expert told bathers not to worry as "just as they appeared, they will disappear from the coast".

He added: "It is not a major problem. The fact that they have appeared now does not mean they will appear all summer."

The jellyfish have already started to disperse and the Red Cross has since deactivated the yellow alert.

Candelas also called for responsibility and calmness in the face of this temporary situation and, above all, respect for these marine animals, reminding the public that human beings are the ones who invade their habitat, not the other way around.

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