HomeFish encyclopediaRay-finned fishesSilversidesSilversidesMunro's hardyhead Munro's hardyhead (Craterocephalus munroi) Scientific name: Craterocephalus munroi Crowley & Ivantsoff, 1988 The Munro's hardyhead (Craterocephalus munroi) is a freshwater fish of the family Atherinidae. Native range: Australia, Bynoe, Nicholson, and Norman Rivers in the lower Gulf of Carpentaria. BiologyDorsal spines (total): 6 - 8; Dorsal soft rays (total): 5-7; Anal spines: 1; Anal soft rays: 6 - 7. Gill rakers (10 to 12) with small spinules, short, stumpy, less than half diameter of pupil. Anus from 0 to 2 scales behind tips of ventrals. Origin of first dorsal fin from 4-6 scales in front of vertical through tips of ventral fins. Second dorsal fin with I spine and 5-7 rays; anal fin with I spine and 6-7 rays. Midlateral scale count 26-29.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCraterocephalus munroiFamilyAtherinidae (Silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length5.0EnvironmentFreshwater; brackish; benthopelagicClimateTropicalDistributionAustralia: Bynoe, Nicholson, and Norman Rivers in the lower Gulf of Carpentaria.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceHigh, 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