🔄 Both

Steelhead

Oncorhynchus mykiss irideus

The steelhead is the sea-run form of the rainbow trout and is considered by many anglers to be the ultimate freshwater game fish. Spending 1–3 years feeding in the Pacific Ocean before returning to their birth streams to spawn, steelhead grow much larger than resident rainbow trout. Their power, speed, and leaping ability — combined with the dramatic wilderness settings where they are found — have inspired generations of anglers and writers.

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Typical Size
24–45 inches (60–114 cm)
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Weight
5–20 lbs (2.3–9 kg) typical; record over 42 lbs (19 kg)
Lifespan
3–11 years; most spend 1–3 years in the ocean
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Water Type
Fresh & Salt

🗺️ Habitat

Born in coastal rivers and streams from Northern California to Alaska; migrates to the Pacific Ocean. Also introduced to the Great Lakes (Great Lakes steelhead).

🔍 How to Identify Steelhead

  • 1Silvery overall (ocean-fresh fish) with a pink stripe and black spots
  • 2More silver and less colorful than resident rainbow trout
  • 3Smaller head relative to body than resident rainbow trout
  • 4More streamlined, torpedo-shaped body from ocean feeding
  • 5Pink lateral stripe and spotted tail similar to rainbow trout

🍽️ Diet

In ocean: crustaceans, squid, herring, and small fish. In freshwater: limited feeding.

💡 Fun Facts About Steelhead

  • Steelhead can return to spawn up to 3 times, unlike Pacific salmon that die after spawning
  • Steelhead can travel over 900 miles from the Pacific Ocean to spawn in Idaho's Salmon River
  • Great Lakes steelhead were introduced in the 1870s and are now well-established in all five lakes
  • The fall/winter steelhead runs on coastal rivers are a revered fishing tradition in the Pacific Northwest
  • Wild steelhead can detect their home stream by the unique chemical signature of its water

🛡️ Conservation Status

Varies dramatically by river — some runs are listed as Endangered or Threatened under the ESA

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