© 2021 MICHIGAN RADIO
91.7 Ann Arbor/Detroit 104.1 Grand Rapids 91.3 Port Huron 89.7 Lansing 91.1 Flint
Play Live Radio
Next Up:
0:00
0:00
Available On Air Stations
Environment & Climate Change

Spring thaw may bring fish kills to Michigan waterways

4478421589_c44c5242cc_o.jpg
NOAA
/
Flickr Creative Commons http://michrad.io/1LXrdJM

As ice and snow melt, Michiganders should not be surprised to come across fish kills.

The state Department of Natural Resources said winter conditions often cause die-offs of fish and other aquatic creatures like frogs, toads, turtles and crayfish.

According to the DNR, winter kills are the most common form of fish kill. They are most often found in shallow lakes, ponds, streams and canals as winter ends.

"These are fish that die because there are low oxygen levels in the lakes, and that usually happens when there's ice cover and snow cover that prevents the sunlight from getting through," said Martha Wolgamood, DNR Fisheries Division Hatchery Manager. 

Low oxygen levels can also be caused by weed growth and decomposition of dead plants, according to Wolgamood. And fish can become stressed because of low energy reserves in winter, and rapid changes in water temperature.

"These kills are localized, and typically do not affect the overall health of the fish populations or fishing quality," said Wolgamood.