HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesHedgehog seahorse Hedgehog seahorse (Hippocampus spinosissimus) Scientific name: Hippocampus spinosissimus Weber, 1913 The Hedgehog seahorse (Hippocampus spinosissimus) is a brackish-water fish of the family Syngnathidae. BiologyFound in the continental shelf, on muddy or sandy bottoms and in coral reefs. Ovoviviparous. The male carries the eggs in a brood pouch which is found under the tail. Length type refers to height (= TL - head length). Less desirable for traditional Chinese medicine, but use may increase with the rise in patent medicines.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHippocampus spinosissimusFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length17.2Depth range70 m (230 ft)EnvironmentMarine; brackish; reef-associated; non-migratory; depth range ? - 70 mClimateSubtropicalDistributionIndo-Pacific: Sri Lanka to Taiwan and Australia. This species has often been misidentified as Hippocampus histrix. International trade is monitored through a licensing system (CITES II, since 5.15.04) and a minimum size of 10 cm applies.Conservation status (IUCN)Vulnerable (VU) (A4cd)Threat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (tm=0.5-1) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026