HomeFish encyclopediaRay-finned fishesNeedle fishesHalfbeaksSlender halfbeak Slender halfbeak (Hyporhamphus roberti roberti) Scientific name: Hyporhamphus roberti roberti Valenciennes, 1847 The Slender halfbeak (Hyporhamphus roberti roberti) is a brackish-water fish of the family Hemiramphidae. Native range: Western Central Atlantic, Venezuela to Brazil. Rhode Island to Florida (USA), Gulf of Mexico. Pacific Ocean. BiologyAn inshore surface schooling species frequently entering brackish estuaries and adjacent areas. Mainly utilized as bait fish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHyporhamphus roberti robertiFamilyHemiramphidae (Halfbeaks)OrderBeloniformes (Needle fishes)ClassActinopterygii (Ray-finned fishes)Maximum length32.0Common length20.0EnvironmentMarine; brackish; pelagic-neriticClimateSubtropicalDistributionWestern Central Atlantic: Venezuela to Brazil. Rhode Island to Florida (USA), Gulf of Mexico. Pacific Ocean..Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercial; bait: usuallyResilienceHigh, 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