HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesGuinean tonguesole Guinean tonguesole (Cynoglossus monodi) Scientific name: Cynoglossus monodi Chabanaud, 1949 The Guinean tonguesole (Cynoglossus monodi) is a brackish-water fish of the family Cynoglossidae. Native range: Eastern Central Atlantic, Mauritania to Pointe-Noire, Congo. BiologyFound on sand and mud bottoms of coastal waters. Feeds on mollusks. Sold as frozen filet under the name 'filets de sole'.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCynoglossus monodiFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length40.0Common length30.0Depth range10–30 m (33–98 ft)EnvironmentMarine; brackish; demersal; depth range 10 - 30 m, usually 10 - 25 mClimateTropicalDistributionEastern Central Atlantic: Mauritania to Pointe-Noire, Congo.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, 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