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humpback salmon

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noun
  1. a pink salmon inhabiting North Pacific waters: so-called because of the hump that appears behind the head of the male when it is ready for spawning.
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Origin of humpback salmon

An Americanism dating back to 1800–10
Also called humpy, humpie.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018