Which dry fly patterns are actually needed?

When I fish the same hatch at the same place, often on the same pools which I do frequently with Sulphurs & Tricos, the fishing typically gets tougher if I use the same fly day after day.

While I haven't written a book or have any science to back it up, I attribute that to the fish being so used to the real flies they have been eating for the last week(s) that they key into different things on the naturals to illicit an "it's OK" strike.

I can't say WHY going from a thorax to a parachute or vice versa is the ticket, but that and working VERY hard on my presentation is usually required to have the same success I had on the first night of the hatch.
 
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