Black Buzzer.
This fly works wonders on stillwaters, ideally they are fished very slowly on a floating line and as long a leader as you are can use
Montana Nymph .
A good all-round nymph /lure in the popular green & black colour combo. Worth trying in both non-weighted and weighted varieties
Hot Head Diawl Bach.
One of the most successful all-year round nymphs, the Diawl Bach in all its variations is still worth a try at this time of year.
Black Minkie
Damsel Nymph