This article is over 5 years old and may contain outdated information.

Science & Tech

Following Greenland Sharks in Canada's Arctic

  • Aug 04, 2015
  • 332 words
  • 2 minutes
Nigel Hussey prepares to tag a Greenland shark in Scott Inlet in 2013. (Photo courtesy of Steven Fields)
Nigel Hussey prepares to tag a Greenland shark in Scott Inlet in 2013. (Photo courtesy of Steven Fields)
Expand Image

Using acoustic and satellite tags, scientists in the Canadian Arctic are slowly gathering information about one of the region’s most mysterious and important creatures: the Greenland shark.

The tags have allowed researchers with the Halifax-based Ocean Tracking Network (OTN) to define the home ranges of juvenile Greenland sharks, the animal’s large-scale movement in the Arctic and how it fits into the food chain in a region where fishing and climate change are becoming major factors.

“We’re piecing together the complicated Arctic food-web structure in which Greenland sharks are an apex predator,” said Nigel Hussey, one of the scientists involved in the OTN tagging program, in an email. “We’ve learned they have a complex vertical diving behaviour, which has impacts in terms of addressing fisheries interactions and could potentially help mitigate or reduce these. We also have data showing these animals returning to the same site a year and two years later — the first evidence of this for Greenland sharks.”

Since starting the Greenland shark study four years ago, OTN researchers have attached acoustic tags to 96 sharks in Cumberland Sound, Scott Inlet, Grise Fjord, Resolute Bay and Maxwell Bay, and placed 24 satellite tags on sharks in Scott Inlet alone, including the first ever deployed on juvenile Greenland sharks. About 30 more of the animals, which weigh an average of 900 kilograms and can reach seven metres in length, are expected to be tagged in 2015.

Hussey noted tracking studies such as the OTN’s help provide baseline science about the poorly understood biology of the fish and its current and future distribution. “Greenland sharks as apex predators help maintain the stability of the Arctic marine ecosystem,” he said, adding that the shark is a bycatch in a harvest of its own food sources. “It’s particularly important [to track them], as exploitation by developing commercial fisheries is increasing while climate change is simultaneously affecting the Arctic at twice the rate of other areas.”


Are you passionate about Canadian geography?

You can support Canadian Geographic in 3 ways:

The Ultimate Arctic Quiz

This story is from the October 2015 Issue

Related Content


Shark tales: Canada’s great whites

As white sharks make their presence known off the coast of Atlantic Canada, researchers and locals want to know: should people be worried? 

  • 3712 words
  • 15 minutes
A large female Greenland shark observed near the community of Arctic Bay, Nunavut


Caught on camera: Elusive Greenland sharks

Using cameras baited with squid, researchers were able to gather information about these ancient Arctic fish without taking any out of the water 

  • 815 words
  • 4 minutes


Study finds reef sharks ‘functionally extinct’ from 20 per cent of the world’s reefs

Lead author Aaron MacNeil discusses what this means for coral ecosystems and what Canadians can do to help

  • 1375 words
  • 6 minutes


Dead or alive: A dive into the landing ban on endangered shortfin mako sharks

Under Canadian leadership, the landing ban means more sharks will survive accidental capture — but is it enough?

  • 1336 words
  • 6 minutes