Apparently Walleye Do Not Like Warm Water
Could warm waters be to blame for a recent decline in walleye? A new study aims to find out. There have been reports of a decline in the popular sport fish, particularly in Wisconsin, Minnesota Ontario. A 2018 study of 473 northern Wisconsin lakes showed a 27 percent decrease of annual walleye production between 1990 and 2012 across all lakes studied.
The Mille Lacs Band of Ojibwe in Minnesota, though, believes warming lake temperatures are the cause of the decline. They recently secured a $200,000 federal grant and are now using underwater listening devices to track the movements of juvenile fish in Mille Lacs to see if the fish are moving into cooler areas of the lake.
If both juvenile and adult walleye are mixed together while seeking out cooler waters, it increases the odds of the older fish eating the younger walleye.