On Sep 3, 12:02*am, Gezellig wrote:
On Tue, 02 Sep 2008 18:39:05 -0400, Bryan Martin wrote:
The Great Lakes have a big problem with zebra mussels, a salt water
species that were imported in ballast water from seagoing freighters.
They have thrived in the big lakes and have been spreading into more and
more inland lakes.

The effect being...?

They kill a number of native fish. In Lake Erie they set back the
recovery
of lake perch. ISTR they are also a nuisance in cooling systems such
as
those used for nuclear power plants.

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FF