No wharf at aussie bay.
There are three Wharfs in the Grove arm. I am 100% certain fishing is allowed at two of them, not completely sure regarding the new one at the start of the QC track. In general all wharfs (maybe a few exceptions) in the sounds can be used by the public, but there might not be land access to them.
There is the Wharf I wrote about a few days back, would be a longer drive.
The wharf in broughton Bay, quite a long drive. The wharf in tara bay is better but longer drive again.
Water depth is quite shallow but all wharfs allow boat access across all tides.
All points require walking.