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From The Collaborative International Dictionary of English v.0.48:
Nerka \Ner"ka\, n. [Russ. niarka, prob. fr. native name.] (Zool.) The most important salmon of Alaska (Oncorhinchus nerka), ascending in spring most rivers and lakes from Alaska to Oregon, Washington, and Idaho; -- called also red salmon, redfish, blueback, and sawqui. [Webster 1913 Suppl.]