HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesThreeline tonguesole Threeline tonguesole (Cynoglossus marleyi) Scientific name: Cynoglossus marleyi Regan, 1921 The Threeline tonguesole (Cynoglossus marleyi) is a marine fish of the family Cynoglossidae. Native range: Western Indian Ocean, Delagoa Bay, Mozambique to Durban, South Africa. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 126-130; Anal spines: 0; Anal soft rays: 105 - 110. Upper side uniformly brown; caudal fin and posterior parts of dorsal and anal fins blackish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCynoglossus marleyiFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length35.0EnvironmentMarine; demersalClimateSubtropicalDistributionWestern Indian Ocean: Delagoa Bay, Mozambique to Durban, South Africa.Conservation status (IUCN)Not EvaluatedThreat 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