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08/12/2008 05:12 am ET | Updated May 25, 2011

Influx Of Jellyfish Signal Declining Health Of World's Oceans

From Spain to New York, to Australia, Japan and Hawaii, jellyfish are becoming more numerous and more widespread, and they are showing up in places where they have rarely been seen before, scientists say. The faceless marauders are stinging children blithely bathing on summer vacations, forcing beaches to close and clogging fishing nets.

But while jellyfish invasions are a nuisance to tourists and a hardship to fishermen, for scientists they are a source of more profound alarm, a signal of the declining health of the world's oceans.

"These jellyfish near shore are a message the sea is sending us saying, 'Look how badly you are treating me,' " said Dr. Josep-María Gili, a leading jellyfish expert, who has studied them at the Institute of Marine Sciences of the Spanish National Research Council in Barcelona for more than 20 years.

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Related:

::More on jellyfish outbreaks as a sign from nature on the Huffington Post.

::More on the environment from the Huffington Post.