Lol. Seriously though, I used to surf every weekend up the Gold Coast - Bull shark capital of OZ

And we usually went early hours of the morning - feeding time, and especially in the murky storm weather - surfers and divers are generally a more higher risk....
And surfing we used to go to places like Curumbin Alley, Point Danger (Dbah) - which opens to the Tweed River, and both spots are full of sharks migrating... yet attacks are "reasonably" rare...
Once had a bull shark swim near us in the Tallebudgerra Creek, told the clubbies and they said "don't worry mate, heaps go through all day... nothing to worry about..." and there were kids swimming just near us.....
maybe its just QLDers.... but up there they don't seem too fussed... even swimming in the canals... no dramas... BUT I am not encouraging swimming in canals!!!!!