The Shark Born Before the French Revolution That Still Defies Science

According to the BBC, the Greenland shark is the longest-living vertebrate known on Earth, with a lifespan that researchers estimate reaches roughly 400 years, challenging fundamental biological understandings of aging. These deep-sea predators inhabit the cold, dark waters of the North Atlantic and Arctic oceans, where slow metabolic rates and unique physiological adaptations allow them to survive centuries of environmental change.

Greenland Shark Lifespan and Deep-Sea Biology

Scientists debate the true longevity limit of the species, with estimates generally ranging between 300 and 500 years. According to the BBC, surviving specimens alive today may have been swimming in Arctic waters since the era of William Shakespeare in 1616 or the French Revolution in 1789. This extraordinary lifespan unfolds in deep waters where temperatures hover around zero degrees Celsius and water pressure is extreme, creating an environment where biological processes run at a vastly reduced pace.

The Rare Discovery of a 150-Year-Old Specimen in Ireland

In April, a dead Greenland shark washed ashore on a beach in County Sligo, Ireland, marking the first recorded instance of the species stranding on the country’s coast. According to the Irish Whale and Dolphin Group, the 3-meter-long animal weighed over 200 kilograms and was roughly 150 years old. Emilie De Loose, a marine biologist with the organization cited by the BBC, noted that despite its massive size, the shark was barely reaching sexual maturity. “Atingiu agora a idade em que poderia começar a reproduzir-se e contribuir para o equilíbrio da população,” De Loose stated, emphasizing that losing a single individual wipes out more than a century of extremely slow growth.

Anatomical Secrets: Hearts, Eyes, and DNA Repair

Researchers transporting the stranded shark to the National Museum of Ireland initiated a multi-year autopsy, harvesting samples of skin, muscle, organs, heart, eyes, and the digestive tract. According to recent scientific investigations, the 34-kilogram heart of the Greenland shark exhibits resilience against age-related cardiovascular decline despite showing normal wear and tear. Furthermore, studies published this year reveal that retinal cells remain healthy and specialized for low-light conditions, defying earlier assumptions that parasitic copepods blindingly degrade their vision over centuries. At the cellular level, researchers found that genes responsible for repairing genetic DNA damage remain particularly active, pointing to potential biological mechanisms that suppress the accumulation of age-related lesions.

Persistent Mysteries of Arctic Predators

Despite decades of marine research, basic life-history traits of the species remain largely unknown. According to Brynn Devine, a marine biologist with the conservation organization Oceans North cited by the BBC, scientists still cannot locate where the sharks mate, where females give birth, or the size of the total population. Compounding these knowledge gaps is their hunting behavior; although slow-moving, researchers discovered these predators successfully capture fast-swimming seals in total darkness, likely by ambushing resting or ice-trapped prey.

Frequently Asked Questions

How long do Greenland sharks live?

According to the BBC, Greenland sharks are the longest-living vertebrates on Earth, with scientific estimates placing their lifespan between 300 and 400 years, and potentially up to 500 years.

Where do Greenland sharks live?

They inhabit the deep, cold waters of the North Atlantic Ocean and the Arctic Ocean, where sunlight barely reaches and water temperatures stay near freezing.

At what age do Greenland sharks reproduce?

Greenland sharks take more than 100 years to reach sexual maturity, meaning a 150-year-old specimen is only just entering its reproductive years.

What do Greenland sharks eat?

While historically believed to scavenge on whale and fish carcasses found on the ocean floor, recent findings show they actively hunt fast-moving prey such as seals in the dark Arctic depths.