HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesNorthern spiny seahorse Northern spiny seahorse (Hippocampus multispinus) Scientific name: Hippocampus multispinus Kuiter, 2001 The Northern spiny seahorse (Hippocampus multispinus) is a marine fish of the family Syngnathidae. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 18. Pectoral fin rays usually 17; trunk rings 11; tail rings 30-35; spines long and sharp, spine above eye equal in length or longer than eye diameter, perpendicular to snout; nose-spine sharp, angled forward 45? to snout, anterior spines on superior tail longer than spaces between them.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHippocampus multispinusFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length14.0Depth range12–60 m (39–197 ft)EnvironmentMarine; demersal; depth range 12 - 60 m, usually 20 - 60 mClimateTropicalDistributionWestern Central Pacific: northern Australia (Dampier Archipelago, Western Australia to Northern Territory) and southern Papua New Guinea. 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)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