But if we start a "ban anything that could colonize our waters" campaign...we are on a terribly slippery slope, that may come back to haunt us all
Be very afraid, now is the time to be proactive. Aquarists are already on this slippery slope. There are many ecologists who unfortunately feel strongly that the solution to aquarium "escapes" is to not give the general public that option at all, since a few have demonstrated they can't handle the responsiblity.
Here's the cover of last month's Fronteirs in Ecology and the Environment:
http://www.frontiersinecology.org/
This is a BIG journal.
One way to get involved is through Habitattitude:
http://www.habitattitude.net/
It's only through cooperative organizations like this that bring all stakeholders to the table that we'll still be keeping fish in the next decade.
Todd