Junior Streamer Fly
While not an exact match, the Rainy's Junior fly is a good "attractor" pattern that mimics the alevin of both trout and salmonids. The eye, placed well, to acts as the egg sac and the overall coloration matches the semi-translucency of "junior". It also attempts to mimic juvenile fish or small baitfish. You will notice the color choices are geared towards specific fish, versus the typical "coloration" of most flies.