Jellyfish crowd northern Italian harbor

STORY: The same phenomenon was observed in April last year, when thousands of barrel jellyfish found their way into the harbor.

"We are observing a warming of the sea and the increase in jellyfish may in part be an effect of this," Valentina Tirelli, a researcher at the National Institute of Oceanography and Experimental Geophysics, told newspaper La Repubblica.

"Small changes in temperature that are not so important for us are important for these invertebrates, the fact that they start reproducing three weeks or a month earlier is of great importance," she said.

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