humpback salmon

noun

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.

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