Very interesting read NSW Fisheries. That's really amazing that a fish that hardy (it can live in a cup of water, I think it said) can be threatened to the point of extiction! What foreign species are invasive and prodigeous enough to wipe out a fish like that?!
Here, we have a bunch of invasive species too. Lampreys, gobies (from the Baltic Sea, I think), zebra mussels (tiny little clams that cover everything in the Great Lakes), and the Asian Big Head carp. They're really messing things up here. Our smelt and lake perch numbers have dropped like a rock since they've been here. Very scary! I hope you guys can bring your fish back. I think you're going to really have to spread the word and get everyone together on this. Good luck! It would be a great victory to get them back on their feet (well, fins anyway and back in action.