HomeFish encyclopediaRay-finned fishesPerch-like fishCichlidsPoor man's tropheus Poor man's tropheus (Hypsophrys nematopus) Scientific name: Hypsophrys nematopus G?nther, 1867 The Poor man's tropheus (Hypsophrys nematopus) is a freshwater fish of the family Cichlidae. In the aquarium it needs water at 21–34°C (70–93°F). Native range: Central America, Atlantic slope of Nicaragua and western Costa Rica, in the San Juan River drainage, including Lake Nicaragua and Lake Managua. Poor man's tropheus care at a glanceTemperature21–34°C (70–93°F) BiologyDorsal spines (total): 18 - 19; Dorsal soft rays (total): 9-10; Anal spines: 7 - 8; Anal soft rays: 6 - 7. This species is distinguished by the following set of characters: teeth properly incisor, even in young; caudal edge of mesethmoid with a unique shape; caudal edge of supraoccipital crest straight, inclined rostrad, its height 27% of postethmoid skull length; width of posterior premaxillary expansion greater than 41% of length of the same bone; arms of articular equal in length; gut S-folded ventrorostrally in adults, anal and medial loops nearly touching; with an abrupt, steep head profile.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHypsophrys nematopusFamilyCichlidae (Cichlids)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length14.0EnvironmentFreshwater;; pH range: 7.0 - 8.0; dH range: 9 - 20 demersalClimateTropicalDistributionCentral America: Atlantic slope of Nicaragua and western Costa Rica, in the San Juan River drainage, including Lake Nicaragua and Lake Managua.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 years (Fec=50-60) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026