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Scores of jellyfish that caused more than 1,000 people to seek medical treatment for painful stings in the Costa Del Sol in July have returned to several beaches this week.
All along the Malaga coast of southern Spain, lifeguards have been forced to shut beaches to protect the public from harm.
Scientists have detected an unusually large plague of the Pelagia noctiluca, commonly known as the 'mauve stinger'.
The small purplish bell shaped creatures deliver painful stings through tentacles that can reach three metres in length.
Spain's tourism ministry has blamed the infestation on overfishing in the region, which has left the jellyfish without natural predators such as turtles, tuna and swordfish.
Other causes put forward have been that winds and ocean currents had caused scores of jellyfish to gather around coves and beaches.
In July 1,700lb of jellyfish were caught in baskets on one day alone, which were then brought on land to be destroyed.
The public is being warned to take care via a poster campaign across several beaches in Spain and to seek immediate medical attention if stung.