Here is how you can easily solve the dilemma of trout nymph fishing. On a day when you have caught several dozen trout on dry flies you know they are feeding well. Now, replace the dry fly with a nymph and continue fishing the same sections of the pools. If you do not continue catching as many trout as you did with dry’s the reason is very simple: You are getting strikes but not detecting them.
I find that the new Murray’s Trout Nymph leader with its special knotted taper and two Scientific Anglers Indicators spaced along it is a great help in discerning the strikes.
As the nymph drifts naturally along the stream bottom be sure to retrieve the line with long line hand strips. Short pulls mask the strike. When you see the strike set the hook quickly with both the line hand and the rod.