
Thornapple Lake is a 409 acre lake that lies in eastern Barry County, about five miles west of the village of Nashville. It is a popular recreation lake with two boat launches and shore fishing opportunities.
The lake originally supported a native Great Lakes-strain muskellunge population until it declined in the 1950s. Stocking of Northern-strain muskellunge in Thornapple Lake began in 1964, and the lake was used as a muskellunge broodstock source from the early 1970s to 2010.
Each spring, Department of Natural Resources biologists collected eggs from muskellunge in Thornapple Lake and then reared the offspring of these fish at Wolf Lake State Fish Hatchery in Mattawan.
In the fall, these fish were stocked throughout the state to support muskellunge fisheries. Recently the DNR implemented a program to stock only native Great Lakes-strain muskellunge in waters connected to the Great Lakes to reduce the potential for negative genetic effects on naturally reproducing muskellunge populations.
Currently, the Great Lakes muskellunge eggs for Michigan’s state fish hatcheries are collected from fish located in Lake St. Clair and the Detroit River. There are two disadvantages with the current system. The muskellunge are hard to locate in such a large system, and the late spawning period for fish in these Great Lakes connecting waters reduces the rearing period in the hatchery and, thus, the size of the muskellunge at the time of stocking into other waters. (Please note, 2017’s egg collection efforts have been cancelled due to a disease outbreak.) Read more