For a bank session, use a five or six weight with a floating line. Add enough leader to keep the fly away from the line. A size 12 to 16 beetle, visible dry or slim nymph covers the main choices.
Walk slowly and look close first. Once you see a fish, place the fly ahead of its path and let the fish close the distance. If the fish refuses twice, change the angle or rest it before changing patterns.
From a boat, begin with the motor off and the drift mapped to finish in open water. Put a dry into a slick when fish are rising, or retrieve a small wet slowly through the lane when they stay below it.
When nothing shows, search above the weed with one or two wets on a floating or intermediate line. Keep the retrieve slow, vary the pause and move after two clean drifts without a sign of fish.
Carry forceps and a soft net. Wet your hands, keep the fish supported in the water and release it once it can hold itself upright. Check, clean and dry boots, waders, boat and trailer before the next water.