Also known as Leatherjacket.
Found singly or in pairs over vegetated rock and rubble bottoms of coastal reefs.
They feed on small invertebrates.
Length - 25cm
Depth - 20-50m
Widespread Mediterranean, Western Indian Ocean
Filefish can alter their colour and pattern to match their surrounds and so deter predators.
Although closely related to the Triggerfish, their "trigger spine" cannot be locked into place. Ref: https://www.fishbase.se/summary/Stephanolepis-diaspros