HomeFish encyclopediaRay-finned fishesSpiny eelsSwamp-eelsGuinea swamp eel Guinea swamp eel (Ophisternon afrum) Scientific name: Ophisternon afrum Boulenger, 1909 The Guinea swamp eel (Ophisternon afrum) is a freshwater fish of the family Synbranchidae. Native range: Eastern Central Atlantic, Known with certainty only from a tidal river at Port Mansoa, Guin?e Bissau although it is reported from Guin?e Bissau to Nigeria. BiologyThe male guards and builds nest or burrow.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOphisternon afrumFamilySynbranchidae (Swamp-eels)OrderSynbranchiformes (Spiny eels)ClassActinopterygii (Ray-finned fishes)Maximum length32.0EnvironmentFreshwater; brackish; demersalClimateTropicalDistributionEastern Central Atlantic: Known with certainty only from a tidal river at Port Mansoa, Guin?e Bissau although it is reported from Guin?e Bissau to Nigeria.Conservation status (IUCN)Data deficient (DD)Threat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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