Also known as Variable-lined Fusilier, Yellowline Fusilier.
Found in large mid-water feeding schools during the day often with Caesio variliniata over coral reefs.
They feed on zooplankton.
Varies in colour from blue to red with night and day.
Length - 22cm
Depth - 8-40m
Widespread Western Indian Ocean
Fusiliers are close relatives of snappers, but are much smaller and more slender.
Schools of fusiliers often have other species mixed in.
Although their colour is predominately yellow/blue, at night and when resting their colours change to red/green. Ref: https://www.fishbase.se/summary/Caesio-xanthalytos.html