hehe.
nope not seen a bullshark. i gues they're there though. i wouldn't worry.
more of a worry would be the 8 foot+ whaler sharks, the great whites that get caught up in the sharks nets at worrim. actually bribie always reminded me a little of amity island from jaws. not sure if it's the people, the beaches or the deep water.

i have seen and sailed with dolphins which was fun.
seen plenty of dugongs, turtles.
we used to skurf on the trawler wakes as they came in from the bay until the trawler operator one day asked us not to because of the hundreds of sharks that followed them in.
i wouldn't worry though. the whole area has been fished out.