HomeFish encyclopediaRay-finned fishesFlatfishesSolesThickback sole Thickback sole (Microchirus variegatus) Scientific name: Microchirus variegatus Donovan, 1808 The Thickback sole (Microchirus variegatus) is a marine fish of the family Soleidae. Native range: Northeast Atlantic, British Isles south to Senegal (baie du L?vrier) and the Mediterranean. BiologyInhabits mud or sand bottoms. Feeds on a wide range of small bottom-living organisms, mainly crustaceans (amphipods, shrimps), also polychaete worms and bivalve mollusks. Utilized as a food fish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMicrochirus variegatusFamilySoleidae (Soles)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length35.0Common length14.0Depth range20–400 m (66–1312 ft)EnvironmentMarine; demersal; depth range 20 - 400 mClimateSubtropicalDistributionNortheast Atlantic: British Isles south to Senegal (baie du L?vrier) and the Mediterranean.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.37; tm=3; tmax=14) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026