a young, silvery salmon in the stage of its first migration to the sea.

1425–75; late Middle English; perhaps akin to smelt2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
smolt (sməʊlt)
a young salmon at the stage when it migrates from fresh water to the sea
[C14: Scottish, of uncertain origin; perhaps related to smelt²]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Effect of smolt length at release on adult returns of hatchery-reared winter
Steelhead exhibit great variation in smolt age and ocean age both within and
  between populations, but there are some trends.
It also describes the results of first year smolt monitoring under the index
  watershed monitoring program.
Due to their faster growth, hatchery steelhead smolt at one year of age.
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