I came to Australia about 5 months ago and although i've been to some remote places i'm still alive.
In fact i haven't seen a shark or a saltie yet and I wouldn't worry about them at all..
Jellyfish is a different thing though , during jellyfish season (may - nov ) i'd never go swimming at the north-east coast.
Just a great beautiful country. But juice is hard to get here , that sucks. I'm clean for 5 months now