HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesKnife-snouted pipefish Knife-snouted pipefish (Hypselognathus rostratus) Scientific name: Hypselognathus rostratus Waite & Hale, 1921 The Knife-snouted pipefish (Hypselognathus rostratus) is a marine fish of the family Syngnathidae. Native range: Eastern Indian Ocean, southern Australia. BiologyInhabits moderate offshore depths. Ovoviviparous. The male carries the eggs in a brood pouch which is found under the tail.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHypselognathus rostratusFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length30.5EnvironmentMarine; demersalClimateSubtropicalDistributionEastern Indian Ocean: southern Australia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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