Nevertheless, it suggests that Greenland sharks may take well over a century to become capable of reproduction.
Imagine a human being needing to live through several generations of descendants before reaching reproductive maturity. The comparison is imperfect, but it gives a sense of how different this shark's life history may be from that of most familiar animals.
For many fish species, reproduction begins relatively early. Populations can recover from losses because individuals mature quickly enough to replace those that die.
Greenland sharks operate on a much slower schedule.
An individual born during the 19th century could, in principle, have reached reproductive maturity only in the 20th century or later. Under the estimates from the study, some sharks living today might have spent much of human recorded history growing toward adulthood.
Their slow maturation also creates a serious conservation challenge.
If a large number of mature Greenland sharks are killed, the population may not be able to replace those animals quickly. Even if fishing pressure decreases, recovery could take decades or longer.
The scientific journal Nature highlighted this concern when discussing the 2016 discovery, noting that a species that takes so long to reproduce may be especially vulnerable to overexploitation.
Source: Nature — Sharks live for centuries.
The discovery therefore offers more than an astonishing age record. It changes the way scientists must think about protecting a species whose members may live through multiple centuries but reproduce only after an exceptionally long period of development.
Life in the Deepest, Coldest Waters
The Greenland shark's environment is another reason it remains so mysterious.
These animals inhabit the North Atlantic and Arctic waters, often at considerable depths. They have been recorded hundreds of meters below the surface and can venture into water more than two kilometers deep.
At those depths, sunlight becomes weak or disappears entirely. Water pressure increases dramatically, temperatures remain low, and food sources differ from those found near the surface.
For humans, exploring such environments requires specialized equipment, remotely operated vehicles, and carefully planned scientific expeditions.
For the Greenland shark, this is simply its habitat.
The species can occupy a wide range of depths, from relatively shallow coastal waters to the dark ocean below. This flexibility makes it difficult to study their movements and understand exactly where individual sharks spend their lives.
Scientists cannot simply follow one shark continuously for centuries. Even modern tracking technologies provide only limited snapshots of an animal's movements and behavior.
As a result, many aspects of the species' biology remain uncertain.
Researchers are still investigating its migration patterns, preferred habitats, reproductive behavior, and the way individuals use different depths throughout their lives.
The shark's slow movements and remote habitat can make encounters difficult, but the animal is not necessarily confined to one small area. Greenland sharks may travel over substantial distances, moving through waters that span different regions and national jurisdictions.
This means that a shark born centuries ago could have experienced changes in ocean temperature, food availability, and human activity across a broad geographic area.
Yet scientists cannot reconstruct the lifetime journey of the exceptionally old female from the 2016 study. Her age estimate reveals something about her potential lifespan, not a detailed record of where she traveled.
The distinction is important because the mystery surrounding Greenland sharks encourages speculation. The strongest discoveries, however, are those that remain grounded in what the evidence can actually establish.