Little Black Stonefly

Overview: The Little Black Stonefly, often called the Winter Stonefly, is a small, hardy stonefly that emerges during the coldest months, bringing life to otherwise dormant rivers and streams. Found in cold, oxygen-rich waters, these insects are an essential food source for trout when other hatches are scarce. Their emergence, often accompanied by snow, provides unique opportunities for winter fly fishing enthusiasts.

Nymph Stage:

Little Black Stonefly nymphs are slim and typically 1/4 to 1/2 inch in length. They are dark brown to black with lighter legs and subtle banding near the abdomen. These nymphs cling to submerged rocks and debris in swift, cold currents. Hook sizes 16 to 20, with size 18 being most precise, are commonly used for imitations. Drift these patterns close to the bottom, targeting seams and slower water near riffles where nymphs are most active before emerging.

Adult Stage:

Adults are 1/4 to 1/2 inch long, with jet-black bodies and translucent gray wings that lie flat over their abdomens. Dry fly patterns tied on hook sizes 16 to 18, typically size 18, are ideal for imitating these adults. They often crawl onto snow-covered banks or flutter weakly over the water’s surface, making them easy targets for trout. Focus on fishing near the edges or slower pools, especially during sunny afternoons when the adults are most active.