The Pacific blue-eye (Pseudomugil signifer) is a species of fish in the subfamily Pseudomugilinae native to eastern Australia. Described by Austrian naturalist Rudolf Kner in 1866, it comprises two subspecies that have been regarded as separate species in the past and may be once again with further study. It is a common fish of rivers and estuaries along the eastern seaboard from Cape York in north Queensland to southern New South Wales, the Burdekin Gap in central-north Queensland dividing the ranges of the two subspecies.
A small silvery fish averaging around 3–3.5 cm (11⁄8–13⁄8 in) in total length, the Pacific blue-eye is recognisable by its blue eye ring and two dorsal fins. It forms loose schools of tens to thousands of individuals. It eats water-borne insects as well as flying insects that land on the water's surface, foraging for them by sight. The Pacific blue-eye adapts readily to captivity.
Pseudomugil signifer is a small, colourful, endemic native fish species inhabiting freshwater streams and estuaries in coastal drainages along much of the east coast of Australia and offshore islands.
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