 Zebra mussels in particular can clog pipes and infrastructure and actually have real costs for utilities or people who want to take water from the lake. They can also be a nuisance if you have a lot of zebra mussels on your dock or your watercraft. They can cut swimmers' feet. Even the dead shells of zebra mussels can continue to be a nuisance after the zebra mussels are dead. Some of the invasive aquatic plants in Minnesota