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10:25in productionCh. 1 · Longest-lived vertebrate/ 10:25 · ceiling 15 min
Fish & sea life

Greenland shark

A shark that lives longer than any nation — and moves slower than any fish its size.

The Greenland shark is the longest-lived vertebrate known, with lifespans of 272–510 years confirmed by radiocarbon dating of eye lens crystals. It matures at ~150 years, gestates pups for 8–18 years, and lives in deep, frigid North Atlantic and Arctic waters. Its extreme slowness — lowest swim speed for its size — reflects a metabolism tuned to cold, darkness, and pressure. It eats carrion and general prey, poses no threat to humans, and faces conservation risk due to bycatch, late maturity, and low reproductive output.

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Chapters & takeaways4
  1. 1:02
    Longest-lived vertebrate

    It lives longer than any other vertebrate — up to 510 years — dated by carbon in its eye lenses.

  2. 2:55
    Reproduction on geological time

    It reaches sexual maturity at ~150 years and gives birth after 8–18 years of gestation.

  3. 4:48
    Sluggish in the abyss

    It lives in freezing deep water (−1.1 to 7.4°C, 100–1,200 m) and swims slower than any fish its size.

  4. 6:13
    Generalist, harmless, unseen

    It eats carrion and whatever else it finds — but never humans, thanks to its remote habitat.

Worth your time?

Yes. See the whole thing.

4.5/ 5
What works
  • redefines vertebrate longevity
  • matches physiology precisely to cold, deep, high-pressure environment
  • links metabolic slowness directly to lifespan and reproduction
What does not
  • threaten humans
  • live in warm or shallow water
  • reproduce early or frequently
See it if
  • deep-time biologists
  • Arctic ecologists
  • physiological adaptation researchers
Skip it if
  • divers
  • beachgoers
  • anyone expecting dynamic behaviour
The written brief1 min read

What the species is and where it came from

The Greenland shark (Somniosus microcephalus) is a cold-adapted, deep-water shark native to the North Atlantic and Arctic Oceans.

How it works, in terms someone would actually use

It swims at the lowest speed for its size of any fish — sluggish, cold-blooded, metabolically slow — in deep, dark, near-freezing water from 100 to 1,200 metres down.

What it gets right

It gets cold, deep, high-pressure existence right: enhanced rod vision, lateral line reliance, TMAO/urea physiology, and DNA repair all match its Arctic abyssal niche.

What it does not

It does not threaten humans. It does not live in warm or shallow water. It does not reproduce early, often, or quickly.

What it changed

It redefines vertebrate longevity: no other known animal lives longer, and none ties lifespan so tightly to metabolic slowness, cold adaptation, and delayed reproduction.

Who it is for, and who it is not

It is for people who study deep-time biology, Arctic ecology, or extreme physiological adaptation. It is not for divers, beachgoers, or anyone expecting action.

Is it worth your time

Yes — if you want to see how life stretches time itself: a vertebrate that outlives nations, reproduces once in a lifetime, and moves so slowly its gestation spans human generations.

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