The "A.P." in this fly's name could stand for either "All Purpose" or the inventor, Andre Puyans. A generic nymph, it looks like a lot of things that live underwater and get eaten by trout.
You can weight the fly with lead under the body or with a beadhead. The unique manner in which they are tied can be incorporated into many other patterns.
A.P. Beaver Nymph
Hook: Mustad 3906B or equivalent
Thread: Black
Tail , Wingcase & Legs: Dark Moose Hair
Ribbing: Gold Wire (copper can also be used)
Body & Thorax: Dubbed Beaver Fur
Head: Dubbed Beaver Fur
A.P. Black Beaver Nymph
Hook: Mustad 3906B or equivalent
Thread: Black
Tail , Wingcase & Legs: Dark Moose Hair
Ribbing: Gold Wire (copper can also be used)
Body & Thorax: Dubbed Black Beaver Fur
Head: Dubbed Black Beaver Fur
A.P. Claret & Beaver Nymph
Hook: Mustad 3906B or equivalent
Thread: Black
Tail , Wingcase & Legs: Dark Moose Hair
Ribbing: Gold Wire (copper can also be used)
Body & Thorax: Dubbed blend of 40% medium color beaver,
20% claret synthetic for, 20% seal brown synthetic fur & 20% hares ear
Head: Dubbed with body blend
A.P. Hendrickson Nymph
Hook: Mustad 3906B or equivalent
Thread: Brown
Tail , Wingcase & Legs: Bronze mallard
Ribbing: Gold Wire (copper can also be used)
Body & Thorax: Dubbed dyed reddish brown beaver or synthetic fur
Head: Dubbed with body blend
A.P. Muskrat #1
Hook: Mustad 3906B or equivalent
Thread: Gray
Tail , Wingcase & Legs: Blue Dun Hackle Fibers
Ribbing: Gold Wire (copper can also be used)
Body & Thorax: Dubbed dark muskrat fur taken from the back of the muskrat
Head: Dubbed with body blend
A.P. Muskrat #2
Hook: Mustad 3906B or equivalent
Thread: Gray
Tail , Wingcase & Legs: Moose Body Hair
Ribbing: Gold Wire (copper can also be used)
Body & Thorax: Dubbed dark muskrat fur taken from the back of the muskrat
Head: Dubbed with body blend
A.P. Olive Nymph
Hook: Mustad 3906B or equivalent
Thread: Brown
Tail , Wingcase & Legs: Dyed olive barred mallard
Ribbing: Gold Wire (copper can also be used)
Body & Thorax: Dubbed dyed olive beaver or synthetic fur
Head: Dubbed with body blend
A.P. Peacock & Pheasant Nymph
Hook: Mustad 9671 or equivalent
Thread: Black
Tail , Wingcase & Legs: Ringneck Pheasant center tail fibers.
Select so that dark center portion covers wingcase area.
Ribbing: Copper Wire
Body & Thorax: Peacock herl
Head: Black tying thread