For those who are interested, red devils, oscars, peacocks (Aulonocara) [I've no idea how they survived] amongst other things have been caught in the Ross River in Townsville. In fact, I think Gleesons weir, about halfway down the river has the highest amount of fish biodiversity (largest number of species) of any freshwater system in Australia? Of course, that's simply due to the fact that many un-educated or negligent red necks inhabit this place and would rather throw their pets into the river than sell it, or find suitable accommadation for it.