HomeFish encyclopediaRay-finned fishesNeedle fishesHalfbeaksPacific halfbeak Pacific halfbeak (Hyporhamphus acutus acutus) Scientific name: Hyporhamphus acutus acutus G?nther, 1872 The Pacific halfbeak (Hyporhamphus acutus acutus) is a marine fish of the family Hemiramphidae. Native range: Pacific Ocean, confined around oceanic islands, ranging from the Marshalls, Gilberts, and Tonga to the Marquesan and Easter islands. BiologyDorsal soft rays (total): 15; Anal soft rays: 17 - 18Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHyporhamphus acutus acutusFamilyHemiramphidae (Halfbeaks)OrderBeloniformes (Needle fishes)ClassActinopterygii (Ray-finned fishes)Maximum length30.0EnvironmentMarine; reef-associatedClimateTropicalDistributionPacific Ocean: confined around oceanic islands, ranging from the Marshalls, Gilberts, and Tonga to the Marquesan and Easter islands.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