I would have to disagree with some of the comments here, from my experience i would say use one sharp hook with Livies when fishing off wharves, pinned behind the dorsal fin, as soon as you see a hit or similar, strike, if a fish has picked your bait up why would you not want to strike? Its in its mouth after all?
If you are fishing the harbour keep using Yakkas, also the fillets of them work unreal. Set your drag tight.
Kamil