Updated October 15, 2026

    Midgefly fishing glossary

    Tiny two-winged flies (Chironomidae) that are a year-round food source for trout, especially in winter.

    Midges are the smallest and most abundant aquatic insects in most trout waters. They hatch year-round — including winter — making them critically important when nothing else is active.

    Key Facts

    • Sizes: Typically #18 to #28 (very small)
    • Colors: Black, olive, cream, red (bloodworms)
    • Lifecycle: Larva → pupa → adult (like caddis)

    Patterns

    • Zebra Midge
    • WD-40
    • Griffith's Gnat (adult cluster)
    • Mercury Midge