Approx. 5 mm. This is a very significant hatch. It is mostly seen at the height of Summer and I was very surprised to see it emerging this late in the season and in such numbers. When this one is emerging, the fish can become quite selective.
This mayfly was collected from the Fall River on November 9th, 2011 and added to Troutnut.com on December 10th, 2011.
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