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ST. JOHN’S, N.L. — Yet another endangered North Atlantic right whale has been found dead in the Gulf of St. Lawrence — the 10th since June 7.

The “unprecedented number of right whale deaths is very concerning,” the federal Department of Fisheries said on Twitter.

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The most recent find was reported Tuesday from the west coast of Newfoundland, though it remains unclear when the whale was first spotted.

North Atlantic right whales are critically endangered, with an estimated number of just over 500.

Jerry Conway of the Canadian Whale Institute in Campobello, N.B., said the deaths are disastrous for an already vulnerable species.

“We feel there is tremendous urgency,” he said Wednesday in an interview. “This has had catastrophic ramifications on the right whale population, this number of whales being killed when we only know of three calves being born this year.

“It certainly indicates a rapid decline in the population.”