HomeFreshwater aquarium fishOddballs & predatorsDwarf stonebasher Dwarf stonebasher (Pollimyrus castelnaui) Scientific name: Pollimyrus castelnaui Boulenger, 1911 Photo: https://www.iucnredlist.org/species/182769/7964380 The Dwarf stonebasher (Pollimyrus castelnaui) is a freshwater fish of the family Mormyridae. Native range: Africa, Okavango basin and upper Zambezi River. Also from the Kafue and Cunene Rivers and northern areas of Lake Malawi. BiologyDorsal spines: 0; Dorsal soft rays: 16-18; Anal spines: 0; Anal soft rays: 22 - 26. Both caudal peduncle and caudal fin have rounded lobes.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePollimyrus castelnauiFamilyMormyridae (Elephantfishes)OrderOsteoglossiformes (Bony tongues)ClassActinopterygii (Ray-finned fishes)Maximum length7.0EnvironmentFreshwater; demersalClimateTropicalDistributionAfrica: Okavango basin and upper Zambezi River. Also from the Kafue and Cunene Rivers and northern areas of Lake Malawi.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: of no interest; aquarium: potentialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More oddballs & predatorsBlack arawanaOsteoglossum ferreiraiBarred bichirPolypterus delheziOrnate bichirPolypterus ornatipinnisBronze featherbackNotopterus notopterusSouth American freshwater stingrayPotamotrygon motoroArawanaOsteoglossum bicirrhosumSee all oddballs & predators SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026