This is a slight variation on the very popular Mercer Poxyback. It is tyed in these colors which have been found the most effective for the Eastern Sierra, California.

It can have lighter bodies with darker backs (the more typical pattern) for Nothern California which works really well there. You can use tan thread with the lighter variations. Because the goal is a thin profile for the fly, use the thinnest thread with the fewest wraps that you can get away with. You can tie this fly really fast so don't really worry about making it too pretty.

This one was tied on a #16 TMC 200R. It's a really easy fly to crank out which is great because the sooner You can get it in the water, the more fun to be had!

Fish it on a dead drift and check it after each catch, the tail and gills take a beating and if either are damaged, replace the fly.