HomeFish encyclopediaRay-finned fishesSilversidesSilversidesUnspecked hardyhead Unspecked hardyhead (Craterocephalus stercusmuscarum fulvus) Scientific name: Craterocephalus stercusmuscarum fulvus Ivantsoff, Crowley & Allen, 1987 The Unspecked hardyhead (Craterocephalus stercusmuscarum fulvus) is a freshwater fish of the family Atherinidae. Native range: Subtropical. BiologyOceania: Australia, in the Murray-Darling drainage system and southeastern rivers as far north as the Mary River, Queensland. Countries | FAO areas | Ecosystems | Occurrences | IntroductionsSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCraterocephalus stercusmuscarum fulvusFamilyAtherinidae (Silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)EnvironmentFreshwater; benthopelagicClimateSubtropicalDistributionSubtropicalConservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026