Salmon
Anadromous fish of commercial and recreational importance worldwide.
Salmon are several commercially important species of euryhaline ray-finned fish from the genera Salmo and Oncorhynchus of the family Salmonidae. They are native to tributaries of the North Atlantic and North Pacific basins, and are important as food fish, farmed intensively in many parts of the world, and as highly prized game fish for recreational fishing.
- Oldest known fossil relative
- Eosalmo driftwoodensis (Eocene, British Columbia, ~50 million years ago)
Lore & Background
Salmon hatch in shallow gravel beds of freshwater headstreams, spend juvenile years in rivers and lakes, then migrate to the ocean as adults. They return to their freshwater birthplace to reproduce, a homing behavior shown to depend on olfactory memory. Tracking studies confirm that most return to the exact stream where they hatched, though a portion may stray to different systems. Some populations are landlocked, remaining in fresh water throughout their lives.
Reader's Guide
Salmon are significant as a major food fish, with intensive farming led by Norway and Chile, and as a highly valued game fish for both freshwater and saltwater anglers. They have been introduced and naturalized into non-native environments such as the Great Lakes of North America, Patagonia, and the South Island of New Zealand. The divergence between Pacific and Atlantic salmon occurred 10 to 20 million years ago during the Miocene, as shown by fossil and DNA evidence. The term 'salmon' is a common name, not a scientific one, and includes several species in the genera Salmo and Oncorhynchus, though some trout species are also informally called salmon. Their life cycle—from freshwater hatching to ocean migration and precise natal-stream return—has made them a subject of folklore and scientific study.
Did You Know?
- The word 'salmon' derives from Latin 'salmō', possibly from 'salire' meaning 'to leap'.
- Chinook salmon is the largest of all Pacific salmon, occasionally reaching lengths over 6 ft (1.8 m) but typically weighing up to 30–50 lb (14–23 kg) or more.
- Only 10% of all salmon eggs are estimated to survive to the smolt stage.
- The extinct Eosalmo driftwoodensis, from the Eocene of British Columbia (~50 million years ago), is an early salmonid; the divergence of Pacific (Oncorhynchus) and Atlantic (Salmo) salmon is estimated to have occurred ar
Frequently Asked Questions
Who is Salmon?
Salmon is the collective name for seven commercially vital ray-finned fish species split across two genera, Salmo and Oncorhynchus, both belonging to the Salmonidae family. They are euryhaline, meaning they can thrive in both saltwater and freshwater.
Where does Salmon come from?
Their native range covers tributary waterways in the North Atlantic (Salmo) and North Pacific (Oncorhynchus) basins. They are not indigenous to the Southern Hemisphere or tropical waters.
What is Salmon's signature ability?
Their hallmark is anadromous migration: they hatch in freshwater streams, spend their adult phase in the open ocean, then navigate back to their natal rivers to spawn. This round-trip life cycle is one of the most well-documented migration patterns in the animal kingdom.
What role does Salmon play in the wider world?
They are intensively farmed as a global food source, with Norway leading production and Chile following closely. They also hold a prized place in recreational angling as a sought-after game fish.
How old is Salmon's bloodline?
The oldest identified fossil relative, Eosalmo driftwoodensis, was recovered in British Columbia and dates to the Eocene epoch. This pushes the salmon lineage back roughly 45 million years.
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