Zebra mussel
Dreissena polymorpha
Causing scratched feet and clogged pipes, Zebra mussels are among the Lake’s most pesky invasives. They reproduce quickly and can overwhelm objects they attach themselves to, including intake pipes, shipwrecks, and even other mussels.

Date of introduction: 1993 in Lake Champlain
Area of origin: Eurasia

USGS Zebra mussel fact sheet