I am not sure of locations where they might be, I have discovered they like to hide in tunnels below the water and stay deep. They come out late at night to feed. If I can know about a spot where someone has caught them even if it was a while ago, then that would give me some glimmer of hope.
I live in Melbourne and I believe I was hooked onto a large Rock Ling at Princes Pier however the pier closes at 10 pm so I stopped going to that spot as when I got big bites I was kicked out of there…