Tooth from lower jaw.
Same encounter as
this observation.https://www.inaturalist.org/observations/151588744
Thanks for pointing it out JM Crossley. It wasn't there for long.
<10cm TL
Not obviously spotted as seen on larger fish so I'm not too sure.
The area has many small scorpionfish at night but this stands out as different. As it is less than 3 cm long, it is much smaller than others, so I have always assumed it may have been a juvenile Maxillicosta scabriceps but is substantially different in appearance
Inside the main cave at Swirl Reef, Rottnest Island