Thorax UV orange trigger point fibers (Troutline UV ribbing fibre)
Hackle Natural hackle (CDC, 2 turns (3 maximum))
How to tie it
Start Uni 8/0 white on the jig hook and run it back to the bend. White underneath keeps the finished colours honest instead of muddying them, which is why the tyer prefers it to black.
Tie in a short sparse tail of Coq de Leon Indio medio or oscuro at the bend, about half a shank long.
Catch in the thick red wire at the tail tie-in point, then build the abdomen forward to the 65% mark.
Rib forward with four or five open, evenly spaced turns of red wire. Thick wire on a jig nymph does three jobs: segmentation, a red attractor line, and armour over a fragile abdomen.
Wrap the UV orange ribbing fibre as the thorax over the front quarter, on a jig fly the orange hot spot sits exactly where a fish sees it first.
Tie in a CDC feather and take two turns, three at most if the barbs are sparse, sweep the barbs back and whip finish. Two turns is deliberate: CDC replaces partridge here because it is less water-resistant and it pulses and waves even when you jig the fly very slowly.