grilse

Etymology

From Middle English grills, grilles, of unknown origin. Cognate with Scots grils, grissill, girls (“young salmon”). Compare English grawl, Scots grawl, graulse (“young salmon, grilse”).

noun

1. A young salmon after its first return from the sea.
   In our own tongue salmon are fry as babies, parr as children, smolt as adolescents, and grilse as adults. 1961, Albert Upton, Design for Thinking: A First Book in Semantics, Stanford University Press, page 4