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Atlantic Salmon |
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Atlantic salmon (English)
Saumon atlantique (French)
Lachs (German)
Salmones (Spanish)
Braddan and bradan (Gaelic)
Bratan (Early Irish)
Iach (ancient Celtic)
Laks (Norway)
Lax (Sweden)
The Atlantic salmon is a world traveller.
It is an anadromous fish - one that spawns in fresh water but spends much of its
life at sea.
The Atlantic salmon's historic range encompassed the North Atlantic Ocean and
its freshwater tributaries from Ungava Bay to Lake Ontario and southward to
Connecticut in North America, and from Russia's White Sea to Portugal on the
European coast. Many of these runs are now reduced or extinct. However Atlantic salmon can
still be found in the rivers of Ireland, the United Kingdom, Canada, the Faroe
Islands, Iceland Norway, Sweden, Finland, Russia, France, Spain, Canada and the
United States.An Atlantic Salmon undergoes many changes during its life. Pea-sized orange
eggs are deposited in riverbeds in autumn. Early the following Spring thousands
of tiny Atlantic salmon alevin emerge. These alevin are about two cm. long, and
subsist off the attached yolk sac, hiding from predators in the gravel of the
streambed. When the yolk sac is nearly gone the young fish wriggle up into the
water, and are called fry until they are about five to eight cm. long. Go to
Atlantic salmon Life Cycle ChartThe Atlantic salmon later acquire vertical markings on their flank,
identifying them as in the parr stage. Parr have dark backs, with 9 to 11 bars,
called parr marks, along their sides - which act as camouflage. Parr remain in
the river for two to 6 years, depending on temperatures and food
supply.
At a length of 12 to 24 cm., parr undergo a springtime transformation into
smolt. Parr marks are replaced by a silvery coat for better camouflage at sea.
Their internal systems adapt for saltwater life, and the fish leave their
streams, travelling to ocean feeding grounds. Salmon from both sides of the
Atlantic rendezvous in the waters off southwestern Greenland. Others travel to
lesser-known oceanic or coastal feeding areas. They grow rapidly on a diet of
small crustaceans and fish. They also must elude predators including larger fish
and marine mammals.After one or more years at sea, following a hereditary route and timetable
Atlantic salmon return to their home rivers in an extraordinary journey that may
span more than 4,000 km. of open ocean. If they return after one winter at sea,
they are called grilse.
Entering the river between April and November, they navigate upstream,
leaping obstructions up to 3m. high to spawn in shallow tributaries in late
fall.
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