Anglerfishes rely on camouflage and their fishing lure to attract unsuspecting prey which is rapidly engulfed.
While this particular smooth angler is grey, the species can vary highly in both colour and pattern.
The small, darker coloured, fleshy enlargement located in between the fish’s eyes, is known as an esca and used as a lure. This appendage resembles an amphipod on which sand gobies feed (which makes up the anglerfishes preferred meal).