HomeFish encyclopediaRay-finned fishesSilversidesBlue eyesPacific blue-eye Pacific blue-eye (Pseudomugil signifer) Scientific name: Pseudomugil signifer Kner, 1866 The Pacific blue-eye (Pseudomugil signifer) is a freshwater fish of the family Pseudomugilidae. In the aquarium it needs water at 23–28°C (73–82°F). Native range: Oceania, endemic to Australia. Pacific blue-eye care at a glanceTemperature23–28°C (73–82°F) BiologyOccurs in clear, cool, fast-flowing streams and also brackish mangrove estuaries. Inhabits tidal mangrove creeks or fringing coastal mangrove and around offshore islands. Also common in clear, forest streams. Water temperature varies between 15? and 28?C, with the lower end of the scale applicable during winter over the southernmost part of the range. The pH fluctuates from 5.5-7.8 according to habitat conditions. At least 15 geographical varieties have been recognized, but detailed morphological studies reveal there is only one species.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePseudomugil signiferFamilyPseudomugilidae (Blue eyes)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length7.0Common length3.5EnvironmentFreshwater; brackish;; pH range: 6.5 - 7.5; dH range: 12 - 15 benthopelagicClimateTropicalDistributionOceania: endemic to Australia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026