Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
ORANGE-FIN, n.comb. The young of the sea trout, Salmo trutta, from the colour of its fin, called elsewhere yellow fin (see Yellow) (s.Sc. 1834 Proc. Bwk. Nat. Club (1885) I. 35).s.Sc. 1885 W. Scrope Salmon Fishing 83:
The Orange Fin, for so the fry of the Sea Trout is called, so much resembles the common River Trout, that it is with very great difficulty it can be distinguished from it.
