Also known as Elliot's Cardinalfish, Golden Cardinalfish, Ringtail Cardinal, Ringtail Cardinalfish.
Found in schools during the day hiding in holes of coral and rock or under ledges dispersing at night to hunt for food over coral and rocky reefs. They form mixed schools during summer and autumn.
They feed nocturnally on benthic and planktonic crustaceans.
Length - 14cm
Depth - 1-40m
Widespread Indo-West Pacific
Males incubate their eggs inside their mouths, as the egg masses increase in size they can be found with wide open mouths where they shift the eggs around to aerate the egg masses. (edit) Ref: https://www.fishbase.se/summary/Ostorhinchus-aureus.html