JawfishesOpistognathidae

Jawfishes possess elongated, moderately compressed bodies and notably large mouths that extend well behind the eye, a characteristic reflected in their scientific name, meaning "posterior jaw". Their coloration is typically cryptic, ranging from pale sandy hues to mottled browns and greys that provide camouflage against the seabed. Most species observed by divers range from 5 cm to 20 cm (2-8 in) in length.

These fish inhabit sandy or rubble seabeds on shallow to moderate reef flats and slopes, typically at depths of 3 m to 70 m (10-230 ft). Each individual excavates a vertical burrow, reinforcing the entrance with small stones, shells, or coral fragments. Jawfishes generally hover head-up above their burrow, feeding on zooplankton and small benthic invertebrates. When disturbed, they retreat rapidly into their shelter. Some species are known for mouthbrooding, with males incubating the eggs in their mouths.