From: Michigan DNR
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 Department of Natural Resources 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 Gary Whelan, DNR Fisheries Division research manager. “As the season changes, it can be particularly common in shallow lakes, ponds, streams and canals. These kills are localized and typically do not affect the overall health of the fish populations or fishing quality.”