A colleague of mine passed me a note regarding the deleterious effects of
introducing Gambusia.

Courtenay, W.R. Jr., and G.K. Meffe. 1989. Small fish in strange
places: A review of introduced poeciliids. -In- G.K. Meffe and F.F.
Snelson (eds), Ecology and Evolution of Livebearing Fishes (Poeciliidae)
pp 319-331. Prentice-Hall, Englewood Cliffs, N.J.

A pretty well done treatise on these critters' ability to displace other
species and disrupt ecosystems. Ask for it at your library, if you're
interested in this subject :-)

I still maintain that we, private citizens, organizations, state or
federal agencies, should not be introducing Exotics. We've enough problems.

Jon. Anderson
Olympia, WA
anderjda at dfw.wa.gov