![]() Subimago: The subimago stage is akin to an adolescent stage of life for the mayfly.Naiads will then rise to the surface of the water and molt into the subimago form. Naiad: The naiad stage can range anywhere from two weeks to two years, however, most naiads develop within 1-2 years.The eggs will remain here from a day to even weeks until they hatch into naiads. The eggs settle to the bottom (or, they may become attached to an object such as a stick or plant that sinks to the bottom of the river bed). Egg: Depending on the species of mayfly, the female can produce anywhere from 4,000 to 8,000 eggs on the water’s surface.What is the mayfly life cycle? Per the MSU Extension, the mayfly life cycle consists of four stages: egg, naiads, subimago, and adult. In the summer of 2019, Ohio residents saw swarms of mayflies everywhere due to their proximity to Lake Erie. Also known as “fishflies,” their swarms - which are common near clean bodies of water such as lakes and rivers - are so large they can sometimes be seen on Doppler radar. Mayflies may be seen in large groups due to the synchronous emergence. Mayflies are, therefore, used as an indicator species when testing for environmental quality,” the Michigan State University research found. ![]() “ are rarely found in degraded bodies of water because their external gills in the nymph stage are very vulnerable to silting and pollution. ![]() The annual mayfly hatch doesn’t just indicate that summer’s approaching-according to Michigan State University (“MSU”) Extension, mayflies confirm the quality of the water in which they hatch.
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