What it looks like: Thumbnail sized, D shaped, and yellow and brownish shells
Scientific name: Dreissena Polymorpha
The Zebra Mussels' are known to have originated in the Caspian Sea, in Europe. The first discovered case in Minnesota happened in Duluth's Superior Harbor in 1989. It then spread by boats, swimming platforms, docks,etc. This organism affects lakes and rivers. It also filters out foods that are necessary for the survival of others species.
How to help: clean weeds and debris from boats, drain boat (including live wells and bait wells), keep all drains unplugged while traveling, dispose of all unwanted bait, leave docks, boats, swimming platforms out to dry for 21 days to prevent spread.
How to remove them: a removal method is known at this point, you can prevent the spread, but you can't eliminate it.
Economic impact: the cost of prevention varies by location, and it isn't cheap to try and prevent the spread. The total cost spent is $1 million annually.
Recreational affects: fish eat zebra mussels that have traces of heavy metals. If humans' eat fish, there is a chance they could be eating contaminated fish.
Sources: Boat with rotor picture http://www.agri.state.id.us/agri/Categories/Environment/InvasiveSpeciesCouncil/Quagga_Zebra_Mussels.php Close up zebra mussel http://www.macrogamta.lt/lt/fotografija/paprastoji-dreisena-dreissena-polymorpha-4505 Lake Minnetonka http://lmcd.org What ZM look like http://www.dnr.state.mn.us/invasives/aquaticanimals/zebramussel/index.html Where they from