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.
Time of day: Evening
In the evening they begin the mating and egg-laying activities, the females flying thirty to forty feet up in the air and dive-bombing the surface. The large insects hit the water with such a force that they send up small splashes. During intense egg-laying activity they may make a smooth surface look rain splattered.
Females lay their eggs on the water's surface and run across the water to return to shore.
Current speed: Still or slow