Small Minnow Mayflies are tiny meals to the trout that love them. They are also useful in telling biologists the level of pollution in water.
Small Minnow Mayflies are a favorite among trout. The fish gobble the Mayflies up in the process of surfacing. Because of this, a model 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 will kill 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. Their abdomen is tipped with the two long, thin filaments. Two sets of wings allow the Small Minnow Mayfly to fly, though the second set - the hind wings - are much smaller than the first set. Wings are clear, but may be patterned with opaque black patches around the edges.
These Mayflies are active during the warm months of the year and range throughout the western parts of North America. This particular species produces multiple generations per year and will appear more so during 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.