HomeFish encyclopediaRay-finned fishesFlatfishesSolesLorentz River Sole Lorentz River Sole (Leptachirus lorentz) Scientific name: Leptachirus lorentz Randall, 2007 The Lorentz River Sole (Leptachirus lorentz) is a freshwater fish of the family Soleidae. Native range: Asia, Indonesia. BiologyDorsal soft rays (total): 68-78; Anal soft rays: 54 - 58; Vertebrae: 40 - 42. This species is distinguished by the following characters: D 68-78; A54-58; pelvic rays 4; lateral line on ocular side of head with ventral branch of 4-6 pored scales, remaining horizontal anterior part with 5-8 pored scales; 84-90 lateral-line scales to point of branching on head, including 8-10 anterior to upper end of gill opening; vertebrae 40-42; dorsal pterygiophores anterior to fourth neural spine 8-9 (usually 9); slender body, depth 3.25-3.5 in SL; head length 4.25-4.5 in SL; caudal-peduncle length 0-22.5 in HL; eye diameter 5.7-7.0 in HL; least vertical interorbital width 12.6-16.8 in HL; longest dorsal ray 2.05-2.2 in HL; caudal fin 4.25-4.6 in SL; origin of pelvic fins adjacent on ventral edge of body, the fins attached posteriorly to base of anal papilla; short pelvic fins, not or just reaching origin of anal fin, 3.05-3.8 in HL; color of ocular side brown, mottled with small darker browSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameLeptachirus lorentzFamilySoleidae (Soles)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length8.1EnvironmentFreshwater; benthopelagicClimateTropicalDistributionAsia: Indonesia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (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