The biggest male great white shark ever tagged in the Atlantic has turned up in Canadian waters after months of silence, capping a summer that has also seen clusters of sharks prowling Maine beaches packed with swimmers.
OCEARCH, the nonprofit shark-research group that tracks the animal, recorded a satellite ping from the shark known as "Contender" on Wednesday at 12:03 p.m. ET. The signal placed him in the waters between Quebec and Newfoundland and Labrador, near the entrance to the Strait of Belle Isle, roughly 1,200 miles from the last confirmed position off North Carolina, where his tracker went quiet in late April.
Contender measures 13 feet 9 inches and tips the scales at nearly 1,700 pounds. Researchers estimate he is about 30 years old. OCEARCH tagged him in January 2025 near the Florida-Georgia coast, and he has been the subject of intense scientific interest ever since, both for his size and for the migration data his tag feeds back to shore.
Contender's tracker fell silent in late April while the shark swam off North Carolina. For weeks, scientists had no data. A brief signal on July 10 failed to reveal an exact location. Then, on August 15, Contender surfaced near the eastern tip of Anticosti Island in Quebec. Four days later, another ping came from Quebec's remote Lower North Shore.
Wednesday's signal was classified as a "Z-ping", a brief surface contact that tells researchers the shark is alive and in the general area but does not lock in precise coordinates. OCEARCH's satellite tags transmit only when a shark's dorsal fin breaks the surface long enough for the Argos orbiting satellite system to pick up the signal. A longer transmission allows a tighter location fix; a Z-ping does not.
OCEARCH stressed that gaps in tracking data do not mean the shark disappeared. It means his fin stayed underwater.
The pattern fits what scientists already know about great white migration. OCEARCH Chief Scientist Dr. Harley Newton described the cycle earlier this year when Contender was still off North Carolina:
"This time of year white sharks are starting their late spring/early summer migration (May 16 to June 30) moving from their southern overwintering area to their summer/fall foraging areas in the northeastern US and Atlantic Canada."
Newton also noted that OCEARCH frequently sees tracked sharks linger off the Outer Banks before heading north, exactly what Contender appeared to be doing when he paused near Pamlico Sound in North Carolina. That stopover is believed to be a critical feeding period, allowing the shark to build energy reserves for a journey of a thousand miles or more.
Contender is not the only great white drawing attention this summer. A cluster of sharks showed up near Pine Point Beach in Scarborough, Maine, just south of Portland, with the first confirmed sightings on August 4. Police in Scarborough reported two juvenile great whites, estimated at six to eight feet long, near Prouts Neck, the Scarborough River's mouth, and the waters off the beach.
Officials later reported up to seven additional sharks near Pine Point Jetty. Witnesses counted as many as nine predators swimming and feeding near shore. Photographer Karl Ramsdell, who captured the activity on camera, put it simply:
"They were everywhere."
No aggressive behavior toward swimmers, surfers, or boaters was reported. But officials urged visitors to stay close to shore, avoid swimming alone or near seals and baitfish, follow lifeguards' instructions, and leave the water immediately if a shark appears.
Maine's history with unprovoked shark attacks is short but sobering. The state has recorded just two confirmed unprovoked attacks since 1837. One of them, a fatal great white attack near Bailey Island in 2020, is recent enough to keep beachgoers on edge.
The Maine sightings and Contender's Canadian trek fit a larger picture. A 2023 study published in the journal Marine Ecology Progress Series estimated that 800 individual great white sharks visited the waters off Cape Cod between 2015 and 2018 alone. Researchers concluded that the waters near Massachusetts may be fully revitalized after years of relative inactivity, meaning the great white population along the northeastern seaboard has bounced back in force.
Favorable summer water temperatures and plentiful prey, baitfish and harbor seals, draw the sharks north each year, typically from May through December, with sightings peaking between July and September. Contender's own movements track that calendar closely. He was spotted near the Massachusetts coast roughly a year before his latest Canadian ping and traveled into Canadian waters last September, approaching the Gulf of St. Lawrence.
OCEARCH uses a SPOT satellite tag mounted on each shark's dorsal fin to transmit real-time GPS data whenever the animal surfaces. The system lets anyone follow Contender's movements on the group's public global shark tracker, when the shark cooperates by breaking the surface. When he was tracked near North Carolina in June, researchers described the stopover as preparation for a long northward push, and the data now confirms that push carried him deep into Canadian waters.
Fox News reported on the shark's northward migration earlier this summer as Contender's path aimed toward tourist-heavy coastlines, underscoring the public-safety dimension of tracking a predator this large.
Contender is not a threat in Canadian waters the way a cluster of juveniles near a busy Maine beach might be. But his reappearance is a reminder that the Atlantic's apex predator is thriving, and that the same conditions pulling him north are pulling dozens of smaller sharks into swimming distance of families on summer vacation.
Officials in Maine have not reported any beach closures tied to the recent sightings, and the sharks near Pine Point showed no interest in people. Still, the advisory to avoid swimming near seals and baitfish is practical advice rooted in biology, not bureaucratic caution. Great whites follow their food. When seals haul out near popular beaches, the sharks are not far behind.
For now, Contender is somewhere near the Strait of Belle Isle, far from any crowded shoreline. His Z-ping told researchers he is alive and moving but not much else. The next time his dorsal fin stays above the surface long enough, the satellite will fill in the rest.
Nature does not check the beach-town tourism calendar, and a nearly 1,700-pound great white does not need anyone's permission to change course.
