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All right, so gambusia is widespread and is almost everywhere and they have been everywhere and are being taken as a threat, people in Tazmania are putting limestone in the water to kill them off but Australia, Holy *@^(! even the fake ponds have gambusia in them, already one species of rainbowfish has been confirmed extinct by the government! if this spread was unkown, then pet stores everywhere would sell them and then the fishing economy would fail from realeased gambusia and then since that failed, eventually every city would lose a major amount of population and that would leave open areas that were uncontrolled and then smoke would choke people and animals to death and then more people would die of this except for people with masks and goggles and more would die because of the shortage of food but eventually the smoke would block out the sun and there we are, doomsday from gambusia. Just like dominoes toppling onto each other. eek

Well, as for your worst case scenario, I highly doubt that will come to pass within our lifetimes... I already know from personal experience that gambusia are not under control to any extent to my knowledge when it comes to the pet trade. They sell them with guppies at those chain pet stores without any knowledge of even doing so! Not only that, but they kill the guppies by tearing their fins apart and stressing them to death. In the wild they may be kept in check by wildlife organizations, but the pet trade is a crime of ignorance and is very much illegal because they are not only mislabelling the fish, but also selling it to people who think that its a guppie!
Then it goes even further when the fish are intentionally released into the wild, I've even caught Swordtails in Florida! So what's to keep all the ignorant people in the world from releasing exotic species, other than severe penalties for the few who are caught, from destroying every ecosystem in existence? Were I to continue rather than leave my ramblings as they are, I would never stop! So let us both speak of facts rather than speculate endlessly, ok? If we don't, how will we ever inform the population and help prevent further devastation?

Don't forget the Least Killifish! They're so small it took me years to find them because I never noticed them in the vegatation! I'll post some other invasive and destructive fish after I refresh my memory later today...

I taught some Eastern Mosquitofish how to jump before, does that count? Otherwise they just hide in the vegatation along the shoreline and eat aquatic insects and plant matter, along with other things they can find...

I dunno, I don't have any fish now...