HomeFish encyclopediaRay-finned fishesNeedle fishesHalfbeaksRobert's river garfish Robert's river garfish (Zenarchopterus robertsi) Scientific name: Zenarchopterus robertsi Collette, 1982 The Robert's river garfish (Zenarchopterus robertsi) is a freshwater fish of the family Hemiramphidae. Native range: Oceania, known only from creeks in the vicinity of Kokoda in southeastern Papua New Guinea. BiologyDorsal soft rays (total): 14-15; Anal soft rays: 11 - 13Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameZenarchopterus robertsiFamilyHemiramphidae (Halfbeaks)OrderBeloniformes (Needle fishes)ClassActinopterygii (Ray-finned fishes)Maximum length13.0EnvironmentFreshwater; pelagicClimateTropicalDistributionOceania: known only from creeks in the vicinity of Kokoda in southeastern Papua New Guinea.Conservation status (IUCN)Lower Risk: least concern (LR/lc)Threat 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