HomeFish encyclopediaRay-finned fishesLightfishes and DragonfishesMarine hatchetfishesSlope hatchetfish Slope hatchetfish (Polyipnus clarus) Scientific name: Polyipnus clarus Harold, 1994 The Slope hatchetfish (Polyipnus clarus) is a marine fish of the family Sternoptychidae. Native range: Western Atlantic, Gulf of Mexico and the Caribbean Sea, in the Gulf Stream as far north as the Scotian Shelf and in the Gulf of Maine. Species factsScientific namePolyipnus clarusFamilySternoptychidae (Marine hatchetfishes)OrderStomiiformes (Lightfishes and Dragonfishes)ClassActinopterygii (Ray-finned fishes)Maximum length6.0Depth range0–833 m (0–2733 ft)EnvironmentMarine; bathydemersal; depth range 0 - 833 m, usually 300 - 400 mClimateDeep-waterDistributionWestern Atlantic: Gulf of Mexico and the Caribbean Sea, in the Gulf Stream as far north as the Scotian Shelf and in the Gulf of Maine.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026