The long stretch of hot weather and lack of rain is causing fish kills in southern Wisconsin, according to the Wisconsin Department of Natural Resources.
They said the weather has resulted in low oxygen levels in the water.
Fish kills have happened in four areas so far, including the Yahara River, below Lake Kegonsa, DNR staff said.
Another, occurring in Dodge County, involved nearly 2,000 fish, they added.
If someone spots a fish kill, the DNR asks people to call their tip line at 1-800-847-9367.