Quote:
Originally Posted by dartmoor navigator
Nope, not a Yellow Sally. As the other thread indicates it looked like a Lacewing, however there have been too many for them to be just 'blow ins' to the river.
The following from the Wisconsin Fly Fisher:
About that size but very light green (and squishy  )
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That is a female Grannom, unmistakable, "moorland" rivers as you have written, free stone as the yanks call them, Limestone as we recognize them, season starts early. April hatches midday and evening rise times. Supposidly continues through the season, but another time for main hatches can be found at the end of the season, September-October.
Failing that aphids, as said, but these stay underneath sycamore tress leafs and will fly once disturbed (animals, nature[wind]etc).
BUT perhaps the tiny caddis is quiet that. A tiny 2mm max long tiny white fly, one of the flys that is named anglers curse. There are 6 species of Caenis from yellow to white (no green) the spinners are usually found around the silty back waters and edges of rivers, again the edges of lakes, but seen usually everywhere!
If you send a piccy we will identify, look at entonology page.