Fish
Filefish
Monacanthidae · also called filefishes, leatherjackets
Swaying gently with the current, a filefish blends almost seamlessly into a bed of soft coral, its thin, leaf-shaped body and rough, sandpaper-textured skin working together to disguise it as little more than drifting vegetation.
Overview
The filefish, family Monacanthidae, is native to ocean and coastal reef habitat across tropical and subtropical regions worldwide. Its rough-textured skin, leaf-shaped camouflage body, and close relationship to triggerfish make it one of the more cleverly disguised and texturally distinctive reef fish families found anywhere.
Camouflage built from shape and motion together
The filefish’s disguise relies on more than just colour, combining a thin, plant-like body shape with a deliberate swaying motion that together convince onlookers it is nothing more than a harmless piece of drifting seagrass.
Status
Least Concern as a family, remaining widespread and generally common across suitable reef habitat worldwide, though individual species vary.
Filefish: common questions
Why is it called the filefish?
It has unusually rough, sandpaper-like skin texture, a feature that gives the family both its common name and its alternative nickname of leatherjacket.
How does the filefish's body shape help it hide?
Its thin, compressed, leaf-like body shape, combined with a gentle swaying motion in the current, helps it convincingly resemble drifting seagrass or soft coral.
Is the filefish related to the triggerfish?
Yes, both belong to the same taxonomic order and share a similarly shaped single dorsal spine, though they are distinct families.
Where are filefish found?
They are native to ocean and coastal reef habitat across tropical and subtropical regions worldwide.