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The Gualupe Fly
     Guadalupe River Hatch Chart
Guadalupe Insects & Matching Fly Patterns

Unlike traditional trout streams, hatches on the Guadalupe River are generally unpredictable and sporadic. Except for freezing winter days, insects can be found year-round. The following photos were all taken on the Guadalupe River.

Insect Description Time of Year Time of Day Fly Patterns
Midge Size #18-24. Larva and pupa are most important. Common colors are black, olive and brown. Prefer colder water below dam. All Year All Day

Larva: Midge Larva, Diamond Midge, Disco Midge, Miracle Midge. G.E.M.

Pupa/Emerger: Gray or Olive RS2, Brassie

Adult: Griffith Gnat, Adams

Size #22-24. Dun has three tails, white wings and black body. Spinner fall occurs right after duns mature. Thick hatches of tricos occur pretty regularly in the morning. Spring, Summer, Fall Morning

Nymph: Black Hare's Ear

Emerger: RS2, WD40, Foam-Wing Emerger

Dun: Not relevant

Spinner: Black Poly-Wing Spinner

Blue-Wing Olive
Size #18-20. Dun has two tails, blue-gray unmarked wings and olive body. Spring, Summer, Fall All Day

Nymph: Pheasant Tail, Olive Hare's Ear, WD-40

Emerger: WD40, BWO Foam-Wing Emerger, Sparkle Dun

Dun: Blue-Winged Olive, Adams

Spinner: Blue Quill Spinner, Poly Wing Spinner

Slate-Wing Drake
Size #12-14.
Dun has two tails, unmarked wings and four hind legs that are light-colored. Slate-Wing Drakes are becoming more and more common on the Guadalupe.
Spring, Summer, Fall Afternoon to Evening

Nymph: Pheasant Tail, Mahogany Hare's Ear, Skip Nymph Dark, Zug Bug, Prince Nymph

Dun: Mahogany Sparkle Dun, Mahogany Thorax Dun

Spinner: Rusty Quill Spinner

Pale Morning Dun
  Size #16-18. Dun has three tails, pale olive body, and unmarked wings.    

Nymph: Olive Hare's Ear, Prince Nymph


Dun: No-Hackle PMD

Spinner: Hen-Wing Rusty Spinner

Hexagenia Size #8. Dun has two tails, barred wings and yellow body. Hex mayflies are pretty uncommon on the Guadalupe. Summer  

Dun: Not relevant

Nymph/Emerger: Chartreuse Woolly Bugger

Light Cahill

Size #14. Dun has two tails, barred wings and yellowish-cream body. Spring, Summer, Fall Afternoon to Evening

Nymph: Gray Hare's Ear, Prince Nymph


Dun: Light Cahill


Caddis flies
(Speckled and Spotted Sedge)
Size #12-16. Spring, Summer, Fall Mid-Afternoon to Evening

Larva: Caddis Larva, Peeking Caddis, Brassie, Olive Serendipity

Pupa/Emerger: Sparkle Caddis Pupa, Soft Hackle

Adult: Elk Hair Caddis, Tent Wing Caddis, Goddard Caddis

Flying Ant Size #14-16. Usually happens after a heavy rains in late May and June. Summer After rain shower Foam Ant
Grasshopper #8-10 Summer All Day Dave's Hopper
Egg Size #12-14. Trout spawn in winter from January to Mid-February. Winter All Day Glo-Bug Egg, Pom-Pom Egg
Scud Size #14-18. Found more in cooler water upstream near moss. All Year All day but mainly in the morning Shell-Back Scud, Flash-Back Scud

Aquatic Worm

Size #12-14. All Year All Day San Juan Worm
Minnow Size #8-12. All Year All Day Woolly Bugger, Clouser Minnow, Zonker, Matt's Bug

Southwest Texas State University Study
According to an April, 1998 study done by Southwest Texas State University:

  • Scuds+Midges+Mayflies+Caddis flies = 91% of drift.
  • Mayflies and Midges are most common in the evening drift.
  • Caddis fly pupae and larvae are most common in mid-afternoon drift Scuds are most common in the early drift, but are available throughout the day.
  • Blue Wing Olives (#18) and Tricos (#24) are the most common Mayflies.
  • The Speckled and Spotted Sedge (#12 - #16) are the most common Caddis.
  • Midges (#18 - #24) are the most common insect in the drift.


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