Found in a rock pool on the rock platform at Flat Rock yesterday …
Update from the Queensland Museum; many thanks to Jeff Johnson, manager of the Ichthyology section:
The jaw is from an eastern blue groper, Achoerodus viridis.
The large teeth in the front and rear of the jaws are used to dislodge, dismember and crush crabs, molluscs and echinoderms on which the fish feeds.
This species occurs between Hervey Bay, Qld and Wilson’s Promontery, Vic and attains at least 100 cm in total length.
I really have no idea what this belonged, too, except to guess a fish. I’ll be sending it off to the museum for ID and will update when I find out. Any ideas, anyone?
Here is the beastie itself – impressive!