HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesGray's pipefish Gray's pipefish (Halicampus grayi) Scientific name: Halicampus grayi Kaup, 1856 The Gray's pipefish (Halicampus grayi) is a brackish-water fish of the family Syngnathidae. Native range: Indo-West Pacific, Gulf of Aden, off Sri Lanka, and from the Gulf of Thailand and Australia to Ky?sh? Islands, Japan. Species factsScientific nameHalicampus grayiFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length20.0Depth range100 m (328 ft)EnvironmentMarine; brackish; reef-associated; depth range ? - 100 mClimateTropicalDistributionIndo-West Pacific: Gulf of Aden, off Sri Lanka, and from the Gulf of Thailand and Australia to Ky?sh? Islands, Japan.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