Back in the 70's through the "bad" pollution periods where no checks were ever made for contaminants entering the river we used to catch bloody big jew in the city reaches on trolled 6" chemical lights. It was easy to get a few strikes each evening we went trolling there but now I think it might be a case of a thousand hours per strike.
Does the river look like it is healthy enough to support big top end predators in the city reaches anymore?
Jack.