Formerly Known As Prince

The Formerly Known As Prince, or FKAP, updates the classic Prince nymph with modern materials and techniques. With a flashy body and biot wings, this pattern is a great attractor nymph that can be fished in a variety of conditions.

Formerly Known As Prince fly pattern - imitates Stoneflies, Mayflies tied for Trout
  • Intermediate
  • Year Round
  • Trout
  • Size 10–18

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The Formerly Known As Prince, or FKAP, updates the classic Prince nymph with modern materials and techniques. With a flashy body and biot wings, this pattern is a great attractor nymph that can be fished in a variety of conditions.

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Materials

Hook
#10-18 Tiemco 3769
Bead
5/64”-7/64” Gold Bead
Thread
Red UTC 70
Tail
Brown Goose or Turkey Biots
Rib
Silver Tinsel
Body
Peacock Herl
Collar
Natural Partridge or India Hen Back
Wings
Large Silver Holographic Tinsel

Overview

This flashy twist on the classic Prince Nymph swaps the traditional body for purple ice dubbing, giving it a vibrant, attractor-style profile. It retains the hallmark biot tails and wingcase but adds a hot spot and bright bead head for visibility and depth. It's tied like a standard Prince, with the main variation being the use of flashier synthetic dubbing and a sometimes colored bead for extra appeal.

Related patterns

Behavior & presentation

Natural Behavior
These large nymphs cling to rocky substrates in fast riffles and runs, foraging among cobble for detritus until dislodged by current or deliberate drift. Their substantial profile and meaty appearance make them high-value targets that trout pursue aggressively even in turbulent flows.
Where Trout Eat It
Trout feed on this pattern in deep runs, pocket water, and along drop-offs in rivers, and near weed beds at 5-15 feet in lakes.
How to Fish It
Dead-drift under an indicator in moderate currents or swing through faster water at drift's end.
Best Water
Most effective in deep runs, pockets, and along drop-offs where current delivers nymphs to feeding zones.
Strike Type
Indicator pauses or tightens as fish intercept the tumbling nymph—strikes may be subtle or aggressive depending on water flow.

Fishing strategy

Rigging Suggestions
Use 4X to 5X tippet depending on water clarity. Fish solo or as the lead fly in a two-nymph rig with a smaller mayfly or midge pattern 18-20 inches below.
Seasonal Timing
Year-round producer, particularly effective during stonefly migrations from February through May and feeding periods in September and October. Works in all water temperatures. Excellent searching pattern when no specific hatch is occurring.
Pro Tips
The tungsten bead gets this pattern down quickly in heavy water. The peacock herl body creates subtle flash that attracts fish in various light conditions.
From River & Run

Where to fish it

Rivers anglers pair with this fly, with local shops that stock it.

Open River & Run

River details and fly shops from River & Run, our sister site.

Entomology

Stonefly nymphs inhabit the rocky substrate of fast-flowing streams, crawling along the bottom in search of detritus and smaller invertebrates. Fish target them opportunistically when they're dislodged by current or during their multi-year nymphal stage, as their substantial size and meaty profile make them an energy-efficient meal worth pursuing even in heavy water.

Order
Plecoptera
Common name
Stonefly
Organism
insect
Life stage
general

Pattern details

  • Stillwater
  • Moving Water
  • Rocky Mountain
  • dead-drift
  • indicator-nymph
  • baetis-hatch
  • stonefly-hatch
  • classic
  • modern
  • attractor
  • searching-pattern
  • swing

Get this fly

Formerly Known As Prince, tied and ready to fish

Hook #10 to #18 · Intermediate