HomeFish encyclopediaRay-finned fishesScorpionfishes and FlatheadsPoachersAlligatorfish Alligatorfish (Aspidophoroides monopterygius) Scientific name: Aspidophoroides monopterygius Bloch, 1786 The Alligatorfish (Aspidophoroides monopterygius) is a marine fish of the family Agonidae. Native range: Northwest Atlantic, western Greenland and Labrador in Canada to Cape Cod in Massachusetts, USA. BiologyInhabits sand and mud bottoms, with temperature range of -1.07 to 2.52?C. Benthic; feeds on crustaceans and bottom fauna.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAspidophoroides monopterygiusFamilyAgonidae (Poachers)OrderScorpaeniformes (Scorpionfishes and Flatheads)ClassActinopterygii (Ray-finned fishes)Maximum length18.0Depth range0–695 m (0–2280 ft)EnvironmentMarine; demersal; depth range 0 - 695 mClimateTemperateDistributionNorthwest Atlantic: western Greenland and Labrador in Canada to Cape Cod in Massachusetts, USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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