blueback

The English word “blueback” has 5 meanings listed here.

noun

A lake trout (Salmo oquassa).
A salmon (Oncorhynchus nerka).
A blueback herring or blueback shad (Alosa aestivalis, syn. Clupea aestivalis) similar to the alewife.
A Beardslee trout (Oncorhynchus mykiss irideus f. beardsleei).
The blueback salmon

From blue + back.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.