DNR Says Spring Fish Kills Aren’t Unusual

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Published: 26 April 2024

MDNR Report

Spring Fish Kill

After ice and snow cover melt on Michigan lakes this spring, it may be more likely for people to discover dead fish or other aquatic animals. While such sights can be startling, the Michigan DNR reminds everyone that it is normal, since winter conditions can cause fish and other creatures such as turtles, frogs, toads, and crayfish to die.

"Winterkill is the most common type of fish kill," said Jeremiah Blaauw, DNR Fisheries Division biologist. "As the season changes, it can be particularly common in shallow lakes, ponds, streams and canals. These fish deaths are localized and typically do not affect the overall health of the fish populations or fishing quality."

Shallow lakes with excess aquatic vegetation and soft bottoms are more prone to this problem, particularly when a deep snowpack reduces sunlight for the plants. Canals in urban areas also are quite susceptible due to the large amounts of nutrient runoff and pollution from roads and lawns and septic systems that flow into these areas, especially from large storm events. 

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