Nerka \Ner"ka\, n. [Russ. niarka, prob. fr. native name.]

(Zo["o]l.) 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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Redfish \Red"fish`\ (r[e^]d"f[i^]sh`), n. (Zo["o]l.)
   (a) The blueback salmon of the North Pacific; -- called also nerka. See Blueback
   (b) .
   (b) The rosefish.
   (c) A large California labroid food fish (Trochocopus pulcher); -- called also fathead.
   (d) The red bass, red drum, or drumfish. See the Note under Drumfish.

Source: Webster's Revised Unabridged Dictionary (1913)