When I was younger and fitter, I took my minnow upstream of the rock bar, several time. There are a few interesting pools, were you can catch bass or goldfish (up to 5 kg). I remenber my enconter there with a 2 metre goana, that really scared the sh!t out of me if you are into fly fishing there is a few freshwater herring too that you can get on very light fly gear providing that you can find some space for a back cast after "smuggling" the fly rod through the rock bars and branches (in your kayak, remember ). Do not ask me how they taste, catching herring on fly is pure w@nk, you would not want to do that for a feed .
I always thought a float tub would be ideal to fish that kind of water, but I never bought one .