HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesGreat seahorse Great seahorse (Hippocampus kelloggi) Scientific name: Hippocampus kelloggi Jordan & Snyder, 1901 The Great seahorse (Hippocampus kelloggi) is a marine fish of the family Syngnathidae. BiologyDeep water species, associated with corals. 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 nameHippocampus kelloggiFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length28.0Depth range120 m (394 ft)EnvironmentMarine; bathydemersal; non-migratory; depth range ? - 120 mClimateDeep-waterDistributionIndo-West Pacific: East Africa and the Red Sea to Japan and Lord Howe Island, 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 humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026