> Stay away from Zebra mussels.  They are nasty things.  They
> are sharp and cut, multiply out of control, plug up any type of
> pipe, and are an environmental and ecological hazard.

Yes, unfortunately a biological solution can turn out to be a
much bigger pest

Many examples, which at the time were well-intended

http://en.wikipedia.org/wiki/Feral_species

Cane toads were introduced to Australia from Hawaii in June 1935
by the Bureau of Sugar Experiment Stations in an attempt to control
the native cane beetle. They bred immediately in captivity, and by
August 1935 more than 102 young toads were released in areas around
Cairns, Gordonvale and Innisfail in northern Queensland. More toads
were released around Ingham, Ayr, Mackay and Bundaberg. Releases
were temporarily limited because of environmental concerns but
resumed in other areas after September 1936. Since their release,
toads have rapidly multiplied in population and now number over
200 million and have been known to spread diseases affecting local
biodiversity

And they poison just about anything that tries to eat them

A fish pond is a very limited environment of course and mussels
can't walk. Yet

Joe
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.