Callibaetis

Overview: The Callibaetis, commonly known as the Speckled Winged Mayfly, is a vital mayfly species for trout anglers, especially in stillwater environments like lakes and ponds. Recognized by its delicate, speckled wings and slender body, the Callibaetis emerges throughout the summer, often during calm, sunny days. Their frequent hatches and extended activity periods make them a favorite for surface-feeding trout and fly fishers alike.

Nymph Stage: Callibaetis nymphs are agile swimmers, ranging in size from 1/4" to 1/2", with slender bodies in olive to brown tones, often featuring a lighter abdomen. These nymphs are best imitated with patterns tied on hook sizes 14–18. They are most active in shallow water, making a slow retrieve or a hand-twist technique highly effective for imitating their darting motion near vegetation.

Adult Stage: Adult Callibaetis mayflies measure around 1/4" to 1/2", with light olive or grayish bodies and speckled, semi-transparent wings. The duns are easily recognized with speckled bodies and distinctive wings, usually featuring a dark background overlaid with white veins. Female spinners are also easy to recognize, with their clear wings marked with dark blotches along the leading edges. Dry fly imitations on hook sizes 14–18 work well during hatches, particularly on calm water surfaces where their duns and spinners rest. Emergence often peaks in the late morning to early afternoon, making accurate casts and gentle presentations essential for success. Spinner falls in the evening can also provide excellent fishing opportunities.