A Chironomid fly pattern imitates the larval stage of a non-biting midge, common in many aquatic environments. These flies are small and slender, often tied with a sparse body and a bead head to mimic the natural insect. When fly fishing with Chironomids, the key is to present the fly at the right depth where trout are feeding, often using a slow retrieve or static presentation. They are typically fished under an indicator or on a long leader in stillwater, and can be highly effective in cold weather when trout feed on these abundant larvae.