DartfishesPtereleotrinae

Dartfishes (Ptereleotrinae) are slender, elongated fishes, typically measuring 7 to 15 cm (3 to 6 inches) in length, though some species reach up to 30 cm (12 inches). They possess large eyes and a distinctive deeply forked or crescent-shaped caudal fin. Body colouration varies among species, often pale grey, blue-grey, or whitish, frequently marked with dark spots, streaks, or banded fins. The common name "Dartfishes" refers to their characteristic rapid retreat into burrows.

These fishes inhabit sandy or rubble patches adjacent to reef slopes, walls, and coral bommies, occurring at depths of 5 to 50 meters (15 to 165 feet). They typically hover motionless a short distance above the substrate, facing into the current to feed on passing zooplankton. At the first sign of danger, they dart headfirst into a self-constructed or shared burrow for immediate shelter, a behaviour that makes them a regular sight in suitable habitats.