mrsswordfisherman's post in Shoals of fish in South Coast Lake (Port Jackson Glassfish) was marked as the answer
mrsswordfisherman's post in Lizardfish was marked as the answer
At last a reply from the museum
Thank you for your enquiry.
Our ichthyologist, Mark McGrouther, has viewed your images and said, though he admitted he couldn't be 100% positive from these photographs alone, that it was most likely a Largescale Saury, Saurida undosquamis.
Please see the following links for more information:
Australian Museum: Largescale Saury
Atlas of Living Australia: Saurida undosquamis
Please let us know if we can be of any further assistance.
mrsswordfisherman's post in Ugly One. (Striate Anglerfish.) was marked as the answer
Thank you for your enquiry. We sent your new photo to Mark McGrouther again and he said "The new image helps. I think the fish is a Striate Anglerfish. It's extremely variable in pattern and colour. http://australianmuseum.net.au/striate-anglerfish-antennarius-striatus. The species is common in Sydney Harbour.
The reason that I think it's a Striate Angerfish is that in the new photo you can see the lure. I've 'circled' the illicium in white below and the esca in yellow; together they make up the anglerfish's lure. The esca is variable but usually looks like a 2-7 worms. The images in the webpage that I mentioned above show escae similar to the one in Donna's fish. Bear in mind that the fish is out of water and the 'worms' are stuck together.
For a listing of the anglerfishes that are currently known from Sydney Harbour, check out the links to Antennariidae here, http://australianmuseum.net.au/fishes-of-sydney-harbour#antennariidae.