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The emergence of the big Hexagenia mayflies signal the high point of trout fishing across much of the upper Midwest and is a much anticipated event. These bugs range in size from a #6 to #2 and when they are on the water may bring out the biggest trout in the stream to feed on the surface. This is a late evening into dark occurence. Anglers get into position around an hour before dark and wait for the Hexes to apppear. If they show up and fish feed, all is good. However, this is all unpredictable and you may not get bugs at all or the bugs may show, but the fish may not feed on top.