HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesEastern spiny seahorse Eastern spiny seahorse (Hippocampus hendriki) Scientific name: Hippocampus hendriki Kuiter, 2001 The Eastern spiny seahorse (Hippocampus hendriki) is a marine fish of the family Syngnathidae. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 17-18. Trunk rings 11; tail rings 34; subdorsal spines 3/0,1,0; nose spine of moderate length, angular in shape; spine above eye long, but shorter than eye diameter; spine behind eye of moderate size, followed by longer lateral head spine; coronet moderately high, sloping back in line with head profile; superior trunk ridge spines reduced to tubercles before dorsal fin in males, or entire ridge having irregular rugose parts with small spines on and in between junctions with rings.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHippocampus hendrikiFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length10.4Depth range16–25 m (52–82 ft)EnvironmentMarine; demersal; depth range 16 - 25 mClimateTropicalDistributionWestern Central Pacific: Queensland, Australia. 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)Data deficient (DD)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