HomeFish encyclopediaRay-finned fishesCusk eelsViviparous brotulasLittoral cusk Littoral cusk (Monothrix polylepis) Scientific name: Monothrix polylepis Ogilby, 1897 The Littoral cusk (Monothrix polylepis) is a marine fish of the family Bythitidae. Native range: Southwest Pacific, eastern Australia. Record from Japan (Machida, 1992) is erroneous. BiologyDorsal soft rays (total): 93-104; Anal soft rays: 64 - 76; Vertebrae: 45 - 47. This species possess the following set of characters: anterior nostril low on snout; copulatory organ of male with a simple and small flap-like pair of (outer) pseudoclaspers; small, size 76869).Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMonothrix polylepisFamilyBythitidae (Viviparous brotulas)OrderOphidiiformes (Cusk eels)ClassActinopterygii (Ray-finned fishes)Maximum length5.0EnvironmentMarine; reef-associatedClimateTemperateDistributionSouthwest Pacific: eastern Australia. Record from Japan (Machida, 1992) is erroneous.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceHigh, 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