Pseudomugil signifer, the Pacific blue-eye, is a species of fish in the family Pseudomugilidae. It is a common fish of rivers and estuaries of eastern Australia, where it forms loose schools of hundreds to thousands of individuals. It eats water-borne insects, as well as flying insects that land on the water surface, foraging for them by sight. A small silvery fish averaging around 3–3.5 cm (1 1⁄8–1 3⁄8 in) in total length, it is recognisable by its blue eye ring and two dorsal fins. It adapts readily to captivity.