HomeFish encyclopediaRay-finned fishesLightfishes and DragonfishesMarine hatchetfishesThreelight hatchetfish Threelight hatchetfish (Polyipnus triphanos) Scientific name: Polyipnus triphanos Schultz, 1938 The Threelight hatchetfish (Polyipnus triphanos) is a marine fish of the family Sternoptychidae. Native range: Indo-Pacific, Suruga Bay and off the Philippines. Also recorded from Indonesia. Species factsScientific namePolyipnus triphanosFamilySternoptychidae (Marine hatchetfishes)OrderStomiiformes (Lightfishes and Dragonfishes)ClassActinopterygii (Ray-finned fishes)Maximum length4.7Depth range331 m (1086 ft)EnvironmentMarine; benthopelagic; depth range 331 - 331 mClimateTropicalDistributionIndo-Pacific: Suruga Bay and off the Philippines. Also recorded from 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