
1) Certain trout 2) Fish 3) Rainbow trout
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1) Trout
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https://www.crosswordclues.com/clue/steelhead

A migratory rainbow trout
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http://english-fly-fishing-flies.s3-website-eu-west-1.amazonaws.com/glossar

A variety of rainbow trout that spawns and lives part of its life in freshwater streams and other parts in oceans. While native to the Pacific Ocean, steelhead have been successfully introduced into many large lakes and now are found in some tributaries of all of North America's Great Lakes.
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http://firstcastflyfishing.blogspot.co.uk/p/glossary-of-terms.html

a migratory rainbow trout that reaches great size after spending most of its life in the ocean; also found in the Great Lakes.
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http://howtoflyfish.orvis.com/glossary/beginners-fly-fishing-glossary

• (n.) The ruddy duck. • (n.) A North Pacific salmon (Salmo Gairdneri) found from Northern California to Siberia; -- called also hardhead, and preesil.
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http://thinkexist.com/dictionary/meaning/steelhead/

They are Rainbow Trout that has returned from the sea. Steelhead closely resemble rainbow trout with a life cycle similar to that of a salmon. They are an anadromous species: born and reared in freshwater streams, as juveniles they migrate to estuaries, adjust to saltwater and then migrate to the ocean to mature into adults. As they begin to sexu.....
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http://whatscookingamerica.net/Glossary/S.htm

saltwater form of rainbow trout (q.v.).[2 related articles]
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http://www.britannica.com/eb/a-z/s/157

The anadromous form of the species Oncorhynchus mykiss. Anadromous fish spend their early life history in fresh water, then migrate to salt water, where they may spend up to several years before returning to fresh water to spawn. Rainbow trout is the nonanadromous form of Oncorhynchus mykiss.
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http://www.encyclo.co.uk/local/21804
Steel'head` noun 1. (Zoology) A North Pacific salmon (
Salmo Gairdneri ) found from Northern California to Siberia; -- called also
hardhead , and
preesil .
2. (Zoology) The ruddy duck.
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http://www.encyclo.co.uk/webster/S/190

(USA) a salmon that is born in freshwater streams and migrates to the sea or large lake, then comes back to spawn
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http://www.fish-uk.com/dictionary.htm

A variety of rainbow trout that spawns and lives part of its life in freshwater streams and other parts in oceans. While native to the Pacific Ocean, steelhead have been successfully introduced into many large lakes and now are found in some tributaries of all of North America's Great Lakes.
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http://www.flyfisherpro.com/Public/Resources/GlossaryofFlyFishingTerms/inde

The USS Steelhead was an American Gato Class submarine of 1525 tons displacement launched in 1942. The USS Steelhead had a top speed of 21 knots surfaced and carried a complement of between 65 and 74. She was armed with one 3 inch dual-purpose gun; two 20 mm Oerlikon anti-aircraft guns; six 21 inch bow torpedo tubes and four 21 inch stern torpedo t...
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http://www.probertencyclopaedia.com/browse/RSA.HTM

A variety of rainbow trout that spawns and lives part of its life in freshwater streams and other parts in oceans. While native to the Pacific Ocean, steelhead have been successfully introduced into many large lakes and now are found in some tributaries of all of North America's Great Lakes.
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https://www.encyclo.co.uk/local/22491

a migratory rainbow trout.
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https://www.encyclo.co.uk/local/22502

a silvery rainbow trout that migrates to the sea before returning to fresh water to spawn.
Found on
https://www.infoplease.com/dictionary/steelhead
No exact match found.