Small Minnow Mayflies are tiny meals to the trout that love them and help reveal the presence of pollution in waterways.
Small Minnow Mayflies are a favorite among trout. The fish gobble up the Mayflies when they surface. Because of this, a replica of the Small Minnow Mayfly is one of the more popular artificial baits made for fly fishermen. Small Minnow Mayflies are attracted to water sources and live much of their lives near them. These tiny insects are sensitive to pollution. Even small amounts of it kills a population, so seeing a healthy number of Small Minnow Mayflies means the water is clean. A stream that sees a fast decline in this insect's population may be experiencing some form of chemical pollution.
Small Minnow Mayflies look very much like other Mayflies. The abdomen is tipped with the two long, thin filaments. Two sets of wings allow the Small Minnow Mayfly to fly, though the second set of wings are much smaller than the first set. Wings are transparent, but may also be patterned with opaque black patches around the edges. This species of Mayfly is active during the warm months of the year and ranges throughout the western parts of North America. It produces multiple generations per year and appears more often in the early and middle hours of the day.
Scientific Name: Callibaetis picta
Other Name(s): Mayfly
Size (Adult; Length): 6mm to 12mm (0.23in to 0.47in)
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.