A vast flotilla of small, virtually undetectable jellyfish have stung hundreds of people on Spanish beaches this week — a swimmer’s nightmare that biologists say will become increasingly common because of climate change and overfishing.
The blobs attacked three areas near the eastern city of Elche along a famed stretch of white sand beaches known as the Costa Blanca. On Tuesday alone, 380 people were stung, compared with the usual four or five swimmers a day, said Juan Carlos Castellanos of the Elche city tourism department.
The was no sign of the jellyfish on Wednesday, but since Sunday at least 700 people have been stung.
“In the five or six years I have been in this job, I have never seen anything like this,” Castellanos said.
The beaches were never closed, but officials put up warning signs and stationed lookout boats offshore.
The tourism official blamed strong currents for sweeping the jellyfish onto the beaches and then calm seas for letting them hang around for three days. Particularly warm waters — which jellyfish like — also helped boost their numbers during Spain’s key summer tourism season.
One problem was these jellyfish were small, almost transparent and thinly spread out over 5km of coastline.
“The swimmers could probably not even see them,” Castellanos added.
Far to the north, a much more menacing species looms — the Portuguese Man-of-War, a floating, violet-colored sack with meters-long tentacles. They have stung more than 300 people over the past three weeks in Atlantic waters off Spain’s northern coasts of Cantabria and the Basque region, officials said.
Spanish marine biologists say, in general, they are seeing fewer jellyfish this summer than in other years. In the Catalonia region and the Balearic islands officials said this summer has been relatively quiet on the jellyfish front.
However, scientists also say Spanish beachgoers are going to have to get used to higher concentrations of jellyfish.
Normally, jellyfish are kept from getting close to the shore by a natural barrier of less-salty water formed with runoff from summer rains.
But with rain more scant because of global warming, this protective cushion is weaker, said Jose Maria Gili, a jellyfish specialist at the Institute of Marine Sciences in Barcelona.
Another problem is overfishing, which depletes stocks of tuna, swordfish and other species that are natural predators of jellyfish.
Fewer fish means fewer competitors for tiny plankton that jellyfish feed on, allowing the latter to flourish, Gili says.
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