Mayfly Life Cycle

I was surprised when I shook the limb that had been full of Mayflies on Sunday and Friday, to see two dead ones fall out and not even one fly off. Mayflies attract bream that attract bass, but the hatch does not last long.

The life cycle of a Mayfly is amazing to me. Adult females lay from 50 to 10,000 eggs, depending on the species, on the surface of the water and the eggs settle to the bottom. They hatch in about two weeks into nymphs that live from two weeks to two years on the bottom, feeding on decaying material and growing.

When grown, the nymph swims to the surface and the skin splits and a winged subimago fly emerges to fly to a nearby bush. After resting overnight, it molts into the adult winged fly, the only insect that molts after developing a winged stage.

Soon after the final molt, the adult flies mate and the females lay eggs on the surface of the water at dusk. The males die after mating and the females die after laying eggs, usually living only one day but sometimes live as long as two days.

No wonder they were all gone at Bartletts Ferry in a week!