HomeFish encyclopediaRay-finned fishesFlatfishesSolesBastard sole Bastard sole (Microchirus theophila) Scientific name: Microchirus theophila Risso, 1810 The Bastard sole (Microchirus theophila) is a marine fish of the family Soleidae. Species factsScientific nameMicrochirus theophilaFamilySoleidae (Soles)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length46.0Depth range40–380 m (131–1247 ft)EnvironmentMarine; demersal; depth range 40 - 380 mClimateSubtropicalDistributionEastern Central Atlantic: Mauritania and Canary Islands (Santa Cruz and Tenerife); extending into the northeast Atlantic from Portugal and southwest of Great Britain.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.15-0.29; tm=3-5) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026