Just remember that it is illegal to collect any bait from intertidal areas in Sydney Harbour.
This copied from DPI site..
Intertidal protected areas
Intertidal protected areas (IPAs) protect intertidal
biodiversity and provide reservoirs of breeding stock to
repopulate nearby exploited areas. They are located at
Bungan Head, Mona Vale Headland, Dee Why
Headland and Shelly Beach Headland (Figures 6 to 9).
The entire shoreline of Sydney Harbour and its
tributaries, including the Parramatta and Lane Cove
Rivers and Middle Harbour, is also an IPA, excluding the
shoreline of North Harbour from Manly Point to the
southern end of Forty Baskets Beach (Figure 2).
All IPAs extend from the mean high water mark to 10 m
seaward from the mean low water mark.
Collecting seashore animals is prohibited in IPAs. This
includes crabs, snails, worms, cunjevoi, octopus, sea
urchins, anemones, pipis, cockles, mussels, oysters and
saltwater pink nippers (yabbies). Line fishing is allowed
in IPAs but you must bring your own bait.
http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0009/329319/Factsheet-737.pdf
Ben