The Zebra Mussel is a small freshwater mollusk that is native
to the Caspian and Black Sea. It was first sighted in the United
States in 1988 in Lake St. Clair. Its spread to the United States
is believed to be caused by the transfer of water by commercial transatlantic
ships. The first commercial report in Lake Champlain was in 1993.
MAP OF ZEBRA MUSSEL DISTRIBUTION IN 1993
MAP OF ZEBRA MUSSEL DISTRIBUTION IN 1995
MAP OF ZEBRA MUSSEL DISTRIBUTION IN 1997
MAP OF ZEBRA MUSSEL DISTRIBUTION IN 1999
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The mussels are filter feeders and consume microscopic plants and animals
that balance the food chain.
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The mussels clog intake pipes to industries that surround Lake Chaplain
such as the Municipal Water Supply Facilities, Georgia Pacific Paper,
and Grand Isle Fish Hatchery.
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As a result of the invasion of zebra mussels, six of the fourteen native
mussel species have been listed endangered.