Hexagenia (Hex)
Hexagenia limbata is the largest mayfly in North American freshwater. Size 4 to 8 hooks. The hatch happens at dusk, sometimes after dark, and it produces the biggest bass and biggest trout of the year for anglers who chase it.
Where it happens in TN
- Reelfoot Lake: Mississippi-system hex spinner falls May-August. Bass surface-feed on falling spinners; bluegill stack on emerging duns.
- Kentucky Lake: similar to Reelfoot but less concentrated. Look for it in the upper bays.
- Hiwassee River, East TN freestones: June-September emergence. Brown trout key on hexes in deep pools after dark.
- Tellico, Watauga, S Holston: secondary; not as concentrated as freestones, but big browns will eat a Hex pattern any summer evening.
The patterns
| Stage | Pattern | Sizes |
|---|---|---|
| Nymph | Hex Wiggle Nymph | 4-6 |
| Emerger | Hex Comparadun | 4-6 |
| Adult | Henry's Fork Hex | 4-6 |
| Spinner | Hex Spinner (rusty) | 4-8 |
Yellow and orange bodies dominate the adult patterns. The natural is pale yellow with darker wings.
Fishing the hex
The window is small: typically 30 minutes either side of full dark. You won't see the fly; you'll hear the rises. Cast across the seam where you heard a fish, count to three, set on any sound or twitch you feel through the line. Most strikes are felt, not seen.
Pre-rig in daylight. You will not retie tippet at 9:30 PM in June. Tippet 3X minimum; the fish that eat hexes are heavy.
Why bigger fish eat hexes
A hexagenia is a calorie payday. A 22-inch brown that ignores a #18 sulphur all day will move 8 feet to eat a #4 hex. The bigger the fly, the bigger the eat: midsummer trophy hunting on East TN tailwaters is a hex-and-mouse game.
The Reelfoot version
On the lake, hexes mean dusk topwater. Bluegill take Hex Sparkle Duns drifting near weed edges. Bass take the same fly stripped slowly, or a popper if the fall isn't producing. The first 45 minutes after sunset is the entire game.