"These jellyfish near shore are a message the sea is sending us saying, ‘Look how badly you are treating me,’" Josep-María Gili, of the Institute of Marine Sciences in Barcelona, Spain, was quoted as saying.
Overfishing of predators such as tuna, sharks and swordfish has resulted in increased numbers of jellyfish, the report added.
Scientists say because jellyfish survive best in damaged habitats, pollution and global warming are also contributing to their increase.
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