Also known as Blue Bridle Cardinalfish, Diamond Cardinal, Golden Cardinalfish, Plain Cardinal, Plain Cardinalfish, Short-tooth Cardinal, Short-tooth Cardinalfish, Short-toothed Cardinalfish.
Found in pairs or small schools over rocky cliffs and shallow reef flats of sheltered coastal and outer reefs.
They feed in invertebrates and zooplankton.
Length - 10cm
Depth - 3-60m
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. Ref: https://www.fishbase.se/summary/Ostorhinchus-apogonoides