Nocturnal Stones.

Ever wonder why when your fishing the Truckee River in the Summer months and you see big stonefly schucks all over the rocks and no adults flying around? The answer to that question is they hatch at night, a nocturnal stone. Trust me, it took a while for me to figure this out. The class of stones is called Claassenia sabulosa, but who cares, they have short little wings and don't fly well. Most of the hatching and egg laying activity occurs after dark. July and August are prime time. This year because of the high water it was in the middle of August and everyone was wondering why their dumb ass Pat's rubber leggs where working so good in August. So next Summer when your tossing your hopper around in the mornings in July fish are probably taking it for a nocturnal stone.