Dubuque has its annual mayfly invasion - KWWL - Eastern Iowa Breaking News, Weather, Closings

Dubuque has its annual mayfly invasion



DUBUQUE(AP)--Dubuque residents know it's that time of year again.

People in downtown Dubuque spent Thursday morning cleaning up the bodies of dead mayflies, using brooms, rakes and leaf blowers.

The mayflies, or "fish flies," as they're known locally, swarmed the downtown area near the Mississippi River Wednesday night.

The Iowa Department of Natural Resources says the Mayfly nymphs live in the river before turning into adults. Once out of the river, the flies live for only a matter of hours. The adults do not eat, they only mate, lay eggs and die.

The blizzard of bugs happens every year in Dubuque and it indicates the river is healthy and clean.

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