LA CROSSE, Wis. (WKBT) - A common sign of a healthy river is expected to return to La Crosse within the next few weeks.
The annual mayfly hatch typically happens in either June or July.
While La Crosse has seen hatches by this time in previous years, biologists say high water and changes in water temperature can delay hatches.
UW-La Crosse officials say while the hatch may not be enjoyable, a sudden lack of mayflies can be concerning.
"We can lose these things, and so when we see numbers go down dramatically, that is a time for concern and biologists will start digging deeper into causes of why that may be occurring," said Roger Haro, UWL's Assoc. Dean of the College of Science and Health.
The bugs are harmless and are a sign of a healthy river because they can only reproduce in areas with high- quality water.
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