The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Shelter type: Sand
Why is the Brassie, the nymph pattern with the copper body, becoming a popular fly in very small sizes -- 18, 20, and 22 -- on spring creeks across the country? It is my belief that the effectiveness of this fly in small sizes is linked with the drifting of Hydroptila larvae in their yellowish sand cases.