Well I am only repeating the concerns outlined by the CSIRO themselves, inoxia can occur in sections of a waterway, it doesn't have to be the whole waterway for their to be a major problem. As for a thousand kilos in three pools comment, no it will probably be worse than that. They can now predict to within a statistical error of 1% what the total biomass of a species is by testing the specific DNA of any species in a waterway and the results were a little scary in regards to carp.