In the Western U.S. & Canada that pesky, much maligned Whitefish is spawning for the next several months. Trout will feed on the drifting pale eggs. So, as long as they are there in those cool streams, you might as well include pale, yellowish eggs in your Winter arsenal for the next several months. Weather yarn eggs or beads, the pale yellow/peach, the size of a pea, is an option for fish holding below the spawning Whitefish.

Whitefish Eggs (FlyfishUSA-Welches, Or)
Whitefish Eggs (WorleyBuggerFlyCo)