Invented by one of the Trout Unlimited founders, George Griffith. This pattern is legendary and will be your best friend during midge hatches. Often times the Griffiths Gnat will be your answer on how to catch fish in the winter. Since it’s a midge imitation, small sizes are most productive. It can be fished top water as a dry, left to sink a bit as an emerger, or twitched and stripped through the water as a worm. Casting this behind a larger dry fly can be deadly too.