A young humpback whale found dead in waters near Montreal only days after delighting Canadians likely died this week in a "boat strike," the examining vet said Wednesday.

"The preliminary diagnosis is a suspected boat strike," said Stephane Lair, a University of Montreal veterinarian leading a post-mortem examination of the two- to three-year-old female that weighed 17 tonnes and was 10 meters (30 feet) long.

The ocean giant's breaches against the backdrop of Montreal drew hundreds to the Old Port neighborhood of Canada's second-largest city for a glimpse of the first of this species to swim so far up a Canadian river.

But its carcass was spotted early Tuesday by a passing commercial ship, two days after it was last seen alive.

It was dragged to the shores of the Saint Lawrence river near the town of Sainte-Anne-de-Sorel, about 80 kilometers (50 miles) east of Montreal, and lifted onto shore with the help of a crane.

"The whale shows signs of trauma, that is to say there were hematomas and hemorrhages which strongly suggest that the animal was struck by a boat," said Lair.

A full report is expected to be made public in a month or two.

The analysis, notably of internal organs, will be "fairly limited," however, due to the body's "fairly advanced state of decomposition," Lair said.

"We don't know what happened," said Robert Michaud, of the Quebec Emergency Network for Marine Mammals, an association mandated by the Canadian government to protect cetaceans in the Saint Lawrence seaway.

"We knew it was a healthy animal with no chronic disease problems," he said.

He added that it was not unusual for young whales to explore beyond their usual habitat.

The Montreal visitor was likely led astray while chasing prey, or made a navigation error when it swam 400 kilometers inland.

Lair said he hoped the magnificent animal's visit would be fondly remembered and give rise to more ocean conservation.

He noted that humpback whales were no longer an "endangered" species and that "the population has experienced a fairly significant rebound in recent decades."

"The more humpback whales there are in the wild, the more likely they are to have negative interactions," he said.

"But that may be proof that the population is increasing."

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Whale that won Canadian hearts believed to be dead
Sorel, Canada (AFP) June 10, 2020
A young humpback whale that swam up one of Canada's major rivers, delighting Montrealers who packed the shores for a glimpse of the first of the species in local waters, is believed to have died, wildlife officials said Tuesday. The pilot of a passing commercial ship early in the morning spotted a "whale carcass" near Varennes in the Monteregie region of the Canadian province, about 20 kilometers (12 miles) east of Montreal, Marie-Eve Muller of the Quebec Emergency Network for Marine Mammals (RQUMM) ... read more