LongfinsPlesiopidae

Longfins (family Plesiopidae) are small, robust-bodied fishes, typically measuring 5 to 15 cm (2 to 6 in) in length. They often possess large eyes and prominent, elongated pelvic fins, which give the group its common name. Their cryptic colouration provides camouflage, ranging from mottled browns and greys to iridescent purples and blues, frequently displaying spots or stripes across their bodies.

These reclusive fish inhabit caves, crevices, and under ledges on coral and rocky reefs, from shallow reef flats down to approximately 40 m (130 ft). Longfins typically live solitarily or in pairs, often seen hovering upside-down or head-down beneath overhangs. When disturbed, they dart quickly into shelter. They are predators, primarily feeding on small crustaceans and other benthic invertebrates. Despite their widespread distribution, their shy behaviour often leads to them being overlooked by divers.