Young mayflies are called nymphs or naiads. They hatch from eggs laid in streams and ponds. A nymph breathes through gills and feeds on water plants. It lives for a few months to two years in the water. It then leaves the water, sheds its skin and becomes winged subimago, or subadult. Mayflies are the only insects that go through this stage. After a few hours, the subimago sheds its skin and becomes a full grown adult. Mayflies are most common in early spring, but may occur until late fall. The nymphs serve as a source of food for fish.
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