Other Common Names: Speckle-winged quill
Scientific Names: genus Callibaetis

This swimming mayfly is the dominant mayfly in lakes. It can also occur in slow sections of some rivers. Hatches begin as early as April or May and continue until the end of September or early October.

When the water is warm enough, eggs grow to mature nymphs in about six weeks. This means there are several generations within one fishing season. The insects get progressively smaller with each generation; in spring, duns are usually matched with a size 14 dry fly, but by fall, a size 16 or even 18 is needed. Also, the duns get darker as the season progresses.

Hatches usually start in mid-morning or early afternoon. While trout take the duns during the hatch, they also take the nymphs beginning a few hours before the onset, and continue taking them during and after the hatch. A Pheasant Tail is a passable imitation of a Callibaetis nymph, but in my experience the Flashback Pheasant Tail outfishes a plain Pheasant Tail by three to one.

When fishing nymphs, use an intermediate line, a long leader, and an excruciatingly slow, steady retrieve. When using a dry fly, trim the hackle off the bottom so it is flush with the dubbing. A cripple pattern is usually a better choice when trout are feeding on the surface. When the wind blows, however, it an be difficult to get a drag-free float of a cripple or dun imitation, so you might want to switch to a nymph when it's breezy.

Spinners can be important. There are no tricks to fishing the spinner fall: just chuck your imitation out there with a thin, long tippet and wait for something to turn up; try to stay awake.


NYMPH COLOR: Tans, olive-browns, olives

DUN SIZE: 6-12 mm (1/4-1/2 in)

DUN COLOR: Wings--mottled brown. Body--Brown-olive to gray on top, light tan to olive below

SPINNER SIZE: 6-12 mm (1/4-1/2 in)

SPINNER COLOR: Wings--clear or with occasional dark markings. Body--medium or dark brown or gray on top, lighter shade below

OTHER CHARACTERISTICS: Nymph--slender shape; gills have lots of lines in them; three fringed tails; antennae 2-3 times as wide as head. Dun and spinner--two tails.

Click on the fly name to see the pattern. Click on the presentation to learn how to do it.

Nymph Pheasant Tail 12-18
slow retrieve, lift-and-settle, wind drift Lakes, slow water
Emerger Callibaetis Cripple 12-18
Gray or tan
chuck-and-sit Lakes, slow water
Dun Adams 12-18
chuck-and-sit Lakes, slow water
Sparkle Dun 12-18
Gray to tan
chuck-and-sit Lakes, slow water
Comparadun 12-18
Gray to tan
chuck-and-sit Lakes, slow water
No Hackle 12-18
Gray to tan
chuck-and-sit Lakes, slow water
Parachute Hares Ear 12-18
Gray to tan
chuck-and-sit Lakes, slow water
Spinner Hen Spinner 12-18
Gray to dark brown
chuck-and-sit Lakes, slow water