Sharks are relatively common here. In Australia, statistics show that you are always within 500 metres of a shark. The beach I swim at (Freshwater), has a local shark fisherman who pulls in some pretty big ones of the beach in the gutters. The flags are generally put in front of sandbars with gutters in front. Honestly, unless a shark is really, really, really hungry he isn't gonna eat you. And think about it, with no commercial fishing, its not like recreational anglers are taking tons of fish. So a shark has plenty of food.
Bull sharks generally go to the gladesville bridge are in search of the masses of fish that congeregate around this structure. Remember, sharks do not naturally eat humans. I see people tubing all the time up in the Harbour. ANd they have not been killed!
Henners