European frog-bit reproduces rapidly, forming dense mats on the surface of the water. These mats can interfere with boat traffic and other recreational activities, as well as, reduce oxygen and light levels in the water column altering food and habitat for wildlife.

European frog-bit is an aquatic invasive plant on the state of Michigan’s watch list. It is important to prevent, detect, and quickly control watch list species because if left unchecked they can spread rapidly with many negative impacts to the environment and economy.

Beginning in 2022, the Lake St. Clair CISMA started monitoring for European frog-bit in Macomb and St. Clair counties. We have been monitoring waterways throughout the counties by kayak, powerboat, and waders and reporting our findings to EGLE. Treatments for European Frog-bit began in 2023, with resurveys and new treatments being added in 2024. Between 2023 and 2024 combined we were able to treat nearly 30 acres of local waterways for European frog-bit!