HomeFreshwater aquarium fishAfrican cichlidsRoyal blue hap Royal blue hap (Otopharynx heterodon) Scientific name: Otopharynx heterodon Trewavas, 1935 The Royal blue hap (Otopharynx heterodon) is a freshwater fish of the family Cichlidae. In the aquarium it needs water at 23–27°C (73–81°F). Native range: Africa, Endemic to Lake Malawi. Occurs in Chilumba, Nhkata Bay, Likoma Island and Monkey Bay. Royal blue hap care at a glanceTemperature23–27°C (73–81°F) BiologyFound mostly on sediment-rich substrates on deeper regions but is also found in the intermediate sand-rock habitats. An opportunistic feeder that feeds from the drifting sediment in the water column.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOtopharynx heterodonFamilyCichlidae (Cichlids)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length12.8EnvironmentFreshwater;; pH range: 7.4 - 8.4; dH range: 7 - 30 demersalClimateTropicalDistributionAfrica: Endemic to Lake Malawi. Occurs in Chilumba, Nhkata Bay, Likoma Island and Monkey Bay.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More african cichlidsOtopharynx lithobatesFlavescent peacockAulonocara stuartgrantiGreenface aulonocaraAulonocara saulosiBlue orchid aulonocaraAulonocara maylandi kandeensisAulonocara chizumuluAulonocara korneliaeFairy cichlidAulonocara jacobfreibergiSee all african cichlids SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026