Zebra mussels. Photo: Invasive Species Centre

Zebra mussels were introduced to the Great Lakes by ocean ships carrying contaminated ballast water around the 1980s. This aquatic invasive species clings to anything possible in the water including boats, docks or beaches, and they multiply very quickly. This invasive species can impact freshwater environments by increasing toxic algal blooms, impact spawning areas by reducing fish egg survival rates, and hindering recreational activities. To prevent the spread of zebra mussels, clean your boat and equipment when you leave a water body to go to a new water body.