Photo by Thomas Ames, Jr.
It is the premier MAYFLY found on the Swift River and its June/mid July appearance is anticipated above all other mayflies including the hendricksons and the scattered BWO hatches. It's numbers can be astounding one year and just "GOOD" on another year but it rarely fails us.
Ephemerella Dorothea is the name that Thomas Ames uses and I do too although some may want to split hairs over WHICH sulphur is really hatching. Don't worry about it because the difference in the different species it too small to care about. Sizes 14 through 18 in standard dressings will get the job done.
The nymph of this species loves the riffles found in places like the riffles above the Gauge Run. There have been many June mornings where I've seen bankside spider webs LOADED with sulphur duns and spinners from the Gauge downstream. But the greatest numbers that I've seen are down in Bondsville. On a mid day last June every trout that I took was stuffed to the gills with sulphur nymphs yet they continued to chase my fly. My Fly?? A Partridge and Yellow or Partridge and Olive swung just below the surface was all that was needed.
Why would Bondsville have greater numbers of this insect (in my opinion) than the Route 9 area? The answer is that it has a good riffle environment and it has water that is a bit warmer and more fertile than the waters upstream. It's strange but Bondsville is always overlooked. A big mistake!!!
So they started stocking just in time for a Northeaster!!!!