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More than 100 dolphins, thousands of fish found dead as Brazilian governor declares state of emergency

More than 100 dolphins died in Brazil last week, and a local governor has declared a state of emergency as experts say additional deaths could be expected.

The Brazilian Amazon continues to grapple with a severe drought. Experts say the most likely cause of the deaths in the lakes were high water temperatures, as temperatures have exceeded 102 degrees Fahrenheit in the Tefe Lake region.

The Mamiraua Institute, a research group of Brazil’s Ministry of Science, Technology and Innovation, said additional dolphins were found Monday. Local media has reported thousands of fish have also died at Tefe Lake, which is key for mammals and fish in the area. Video provided by the institute showed dolphin carcasses beached on the lakeside.

“In one week we have already lost around 120 animals between the two of them, which could represent 5% to 10% of the population,” said Miriam Marmontel, a researcher from the Mamiraua Institute.

Fleischmann said investigators are still determining the cause of the dolphin deaths but that the high temperature remains the primary candidate.

The Associated Press contributed to this report.

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