Various Mayfly patterns were thrown at the trout with moderate success, but after tying on a Stimulator fly i had a run of beautifully marked fish.
Mayflies tend to make the bigger fish less wary, so with stealth and careful casting, these small rivers will reveal some fine fish.
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This time last year i caught fish at Mayfly time with a Balloon Caddis pattern so maybe a perfect Mayfly pattern is not necessary.