Off Nova Scotia, a bid to ‘unravel the mystery’ of great white sharks

The question: Is Nova Scotia the second mating site for Atlantic white sharks, something scientists say could be key to protecting the endangered species.

Chris Fischer, founder of Ocearch and expedition leader, poses for a portrait aboard a ship on the water off the coast of Lunenburg, N.S., Thursday, Sept. 20, 2018. THE CANADIAN PRESS/Alison Auld

Not far off Nova Scotia’s rough-hewn shoreline, scientists on board an aging crab boat lay in wait for one of the marine world’s greatest — and most mysterious — predators.

The researchers are busy “working the water” — dunking bits of fish in hopes of drawing a great white shark close enough to catch it and very carefully direct it onto their large boat.

Once they get a shark on board, the Ocearch team plans to afix it with several satellite tags that can collect data identifying everything from water temperature and salinity levels to its movements and feeding behaviours.

They’re hoping the information can help them answer a central question — whether Nova Scotia may be a second mating site for Atlantic white sharks, something scientists say could be key to protecting the endangered species.

“We’re up here trying to solve the puzzle of the North Atlantic white shark population,” Dr. Bob Hueter, chief scientific advisor for the Ocearch expedition, said Thursday just outside the mouth of Lunenburg harbour on the first day of the team’s three-week expedition.

“We’re just beginning to unravel the mysteries of the white shark in the North Atlantic — where they’re giving birth, their migratory patterns, where they mate, which is why we’re here, and what they feed on.”

The team was drawn to the area after one of Ocearch’s tagged sharks — an adult male named Hilton, known for a wry Twitter feed that regularly tweets out his movements — ventured into the region last fall and then returned this year, suggesting he was here seeking out a mating partner.

Chris Fischer, the founder of Ocearch and the expedition leader, said white sharks are known to mate around Nantucket, Mass., and give birth off the south shore of Long Island, N.Y. But, he said Hilton and a female tagged shark named Lydia didn’t go to those areas, indicating they may be spending their time mating in other areas.

“We believe he’s showing us a second aggregation site and if we can find other mature males and other mature females, that might lead us to believe there’s some mating going on here,” he said on the Ocearch vessel, a former Bering Sea crab boat that now serves as the group’s main research boat.

“Hilton knows where he is and what he’s doing. He’s not lost. These animals have an unbelievable capacity to navigate and a very accurate calendar. He’s here for a reason.”

Related: Researchers tag great white shark in Atlantic Canada

Related: New Brunswick couple followed by great white shark

Last week, federal scientists on a separate mission successfully tagged a great white shark in Atlantic Canadian waters for the first time.

The Ocearch team, which includes 26 researchers from 19 U.S. and Canadian universities and labs, hopes to catch a shark by hooking it onto a line held by crew on a smaller boat who will then try to lead the shark to the large Ocearch vessel.

They will try to guide the shark onto a submerged platform with the help of a crew member who jumps from the small boat into the water with the shark to secure it on the platform.

Lindsay Laughner, an education co-ordinator with Ocearch, explained that the platform is then raised so scientists can attach the tags and begin their sampling. They will place a wet towel over its eyes and a saltwater hose in its mouth to flush water through its gills while their work is being done.

“We can do about 12 research projects in 15 minutes before that shark is tagged and released, so it’s really exciting,” she said in the tight confines of the boat’s tackle room, where researchers will handle the samples.

They will also insert an acoustic transmitter in the shark that will provide data on its location for about 10 years. Hueter, who has studied sharks for more than four decades, said the whole process was akin to an “alien abduction,” but one that hasn’t appeared to cause the animals any stress.

Laughner said about 10 institutions will also receive samples from animals that are caught so they can do their own research using the blood, mucus, muscle, parasite, genetic and other samples collected by Ocearch. She says it will provide much more sophisticated data than previously available.

“We want to get as many people working on this as possible,” she said. ”We’re losing 250,000 sharks a day to shark fin soup and bycatch and for their liver oil, so it’s very important that we get everybody together so we can collaborate and help see where our sharks are moving and why they’re going there.”

Before 2007 when Ocearch was founded, scientists didn’t know much about the life history of the North Atlantic white shark. In 2013, the group started a project specifically on that species and tagged five sharks. The group, which receives about $1.7 million a year in public and corporate donations, has tagged 37 white sharks and hope to tag 60 in total.

Fischer said learning about the sharks’ migratory patterns, nursery areas and mating habitats is critical to its survival and the overall health of the ecosystem, since the apex predators help manage other species.

“Sharks are the lions of the oceans — they’re the balance keepers,” he said on deck, as light winds and rolling swells buffeted the boat. “They keep the second tier of the food chain from exploding and wiping out all of the food that we want to eat.”

Alison Auld, The Canadian Press

Like us on Facebook and follow us on Twitter.

Just Posted

Regional unemployment rate drops

But fewer people are working overall

Horizon North construction to start soon

The first gear will start rolling into Kitimat at the beginning of 2019

Haisla yet to sign LNG benefits deals with the province

Other First Nations already receiving cash payments

Area First Nations benefit from LNG Canada project

Agreements with province provide cash, land

Work begins on a new Haisla health centre

It will include a telehealth room, a place for visiting physiotherapists and dentists

Story of the Year: Deadly Humboldt Broncos bus crash

The Canadian Press annual survey of newsrooms across the country saw 53 out of 129 editors cast their votes for the Humboldt Broncos bus crash.

A journey through 2018’s top pop culture moments

Was there any pop culture this year? Of course there was.

‘A stronger Alberta:’ Ottawa announces $1.6B for Canada’s oil and gas sector

Price of Alberta oil plummeted so low that Alberta’s Premier said Canada was practically giving it away

Wicked weather, including heavy snow, rainfall, hammers southern B.C.

Environment Canada has posted winter storm warnings for the Coquihalla Highway, Highway 3

Caretaker jailed, must pay back money after stealing $260K from elderly B.C. couple

Antonette Dizon, now 50, had been hired to provide extra care for Henry and Helen Abfalter

Retailers feel the squeeze of their generous return policies

Technology data tracking can clamp down on fraudulent abuse

Canadians to get low-cost data-only mobile phone plans within 90 days: CRTC

Bell, Rogers and Telus will provide plans as cheap as 250MB for $15

Man rescued from sinking boat off the coast of Vancouver Island

Mayday call came into Coast Guard saying vessel had taken on water, BC Ferries dispatched to scene

Four per cent of Canadian women report being sexually harassed in the workplace

One per cent of men report being sexually harassed in the workplace

Most Read