Cait & the Critters A Digital Atlas of Animal Life · Species, behaviour, habitats & stories
Fish

Atlantic Salmon

Salmo salar

Near Threatened

Fast Facts

Lifespan4–8 years
HabitatRivers
DietCarnivore — insects, crustaceans and smaller fish
ActivityDiurnal
Size70–150 cm long
Weight3.5–15 kg

About

The Atlantic salmon is a powerful, streamlined fish renowned for one of the most astonishing life journeys in the natural world. Hatched in gravelly rivers, it migrates thousands of kilometres out into the open ocean before returning, against all odds, to the very stream of its birth to spawn.

Its silver flanks and remarkable homing instinct have made it a celebrated symbol of wild rivers and clean water.

Behaviour

On its return migration, the salmon fights its way upstream against powerful currents, leaping waterfalls and rapids, drawing on fat reserves as it ceases to feed. Males develop a hooked lower jaw, or 'kype', during the breeding season.

After spawning, most Atlantic salmon die, though a few survive to breed again.

Did you know?

  • Salmon navigate back to their birth river using smell and the Earth's magnetic field
  • A leaping salmon can clear obstacles well over two metres high
  • They stop feeding altogether once they enter fresh water to spawn
  • The word 'salar' in its scientific name means 'the leaper'

Distribution

North Atlantic Ocean and the rivers draining into it in Europe and North America

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