Home › Actinopterygii › Salmonidae › Chinook Salmon (Oncorhynchus tshawytscha)
SPECIES PROFILE
Chinook Salmon (Oncorhynchus tshawytscha)
Oncorhynchus
IUCN STATUS
Threatened
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CONSERVATION STATUS
Threatened
CLASS
Actinopterygii
GEOGRAPHICAL RANGE
Pacific coast rivers from California to Alaska; the Columbia and Snake River systems are critical spawning habitats
DIET
Carnivore
HABITAT
Cold, well-oxygenated rivers and streams for spawning; Pacific Ocean for 2–6 years of ocean feeding
🔬 Classification
PHYLUM
Chordata
CLASS
Actinopterygii
ORDER
Salmoniformes
FAMILY
Salmonidae
GENUS
Oncorhynchus
📋 Description
SIZE
Commonly 60–90 cm; 4–14 kg; record individuals exceed 50 kg
COLORATION
Ocean phase: metallic blue-green back with black spots on upper body and tail; spawning males turn dark red to olive-brown with a hooked jaw (kype)
ADAPTATIONS
Returns to its natal stream using olfactory memory; can detect its home river's chemical signature after years at sea
🌿 Ecology
HABITAT
Cold, well-oxygenated rivers and streams for spawning; Pacific Ocean for 2–6 years of ocean feeding
DIET
Carnivore
GEOGRAPHIC RANGE
Pacific coast rivers from California to Alaska; the Columbia and Snake River systems are critical spawning habitats
REPRODUCTION
Semelparous — spawns once then dies; female digs a redd (nest) in gravel; 3,000–14,000 eggs; carcasses fertilise riparian ecosystems
DIET DETAILS
Juveniles eat insects and invertebrates; adults in the ocean eat herring, squid, and other fish
⚠️ Threats & Conservation
PRIMARY THREATS
Dams blocking migration; habitat degradation; ocean warming; over-harvest; hatchery competition with wild fish
💡 Interesting Facts
1
Chinook Salmon are the largest Pacific salmon species and a keystone of Pacific Northwest ecosystems — their carcasses transfer marine nutrients inland, feeding everything from bears to trees.
2
A single Chinook can travel over 1,000 km upstream to its natal spawning grounds guided entirely by its memory of the chemical signature of that specific tributary.
🔭 Sighting Guide
📍 BEST PLACES TO SIGHT
Issaquah Hatchery near Seattle, WA, allows close viewing of Chinook Salmon returning to spawn each autumn
Rogue River near Gold Beach, OR, has wild Chinook Salmon runs viewable from public riverbanks
Elwha River in Olympic National Park, WA, is recovering after dam removal and now has returning Chinook
🗓️ BEST TIME TO SIGHT
Autumn. Salmon runs peak September to November in Pacific Northwest rivers; watch from bridges and riverbanks as fish leap upstream.
🎯 SIGHTING TIPS
September to November: the Issaquah Hatchery near Seattle, WA, and the Rogue River, OR, offer accessible salmon run viewing.
