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WATCH: An endangered North Atlantic right whale was spotted off Portland Harbor in September

An endangered North Atlantic right whale was videotaped off Portland Harbor last month, a few miles off the coast. The animal was filmed just weeks before controversial new rules that aim to protect the species from entanglement with lobster gear go into effect.

In the video, the whale can be seen slowly swimming along in Casco Bay, diving, surfacing, then diving deeper, with its tail flukes last to disappear. A recreational boater who filmed the animal said it seemed curious about the boat's occupants, swimming alongside, occasionally pausing and seeming to take in the sun.

The videographer, who preferred to remain anonymous, says the whale, which is one of roughly 370 left on the planet, seemed healthy and calm during its 15-minute sojourn between Peaks Island and Cape Elizabeth.

A spokesman for the National Oceanic and Atmospheric Administration says the agency considers the sighting to be “definite” and it will be entered in the national catalogue of confirmed North Atlantic right whale sightings.

Amy Knowlton, a whale expert at the New England Aquarium, says white scar tissue that can be seen on the flukes indicate that at some point the young whale likely got entangled with fishing gear.

"They seem to be minor injuries, but clearly it did get entangled with some sot of gear. Seemed to be healed injuries," Knowlton says.

In less than two weeks, more than 950 square miles of fishing grounds will be put off limits to traditional rope-and-trap-pot lobstering. That's some 30 miles off Maine's coast, where regulators say thicker gear-rope and longer trawl lines pose a bigger threat to the whales. Next spring measures to make it easier for whales to break through rope used closer to shore will also go into effect.