HomeFish encyclopediaRay-finned fishesFlatfishesLefteye floundersDeepwater flounder Deepwater flounder (Monolene sessilicauda) Scientific name: Monolene sessilicauda Goode, 1880 The Deepwater flounder (Monolene sessilicauda) is a marine fish of the family Bothidae. Native range: Western Atlantic, Canada to Georges Bank and northern Gulf of Mexico to northern Brazil. Species factsScientific nameMonolene sessilicaudaFamilyBothidae (Lefteye flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length18.0Common length14.0Depth range150–550 m (492–1804 ft)EnvironmentMarine; bathydemersal; depth range 150 - 550 mClimateDeep-waterDistributionWestern Atlantic: Canada to Georges Bank and northern Gulf of Mexico to northern Brazil.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026