Barbour's seahorse (Hippocampus barbouri)

Classification (WoRMS)

Full classification as recorded by WoRMS: Kingdom: Animalia · Phylum: Chordata · Class: Teleostei · Order: Syngnathiformes · Family: Syngnathidae · Genus: Hippocampus.

Accepted name: Hippocampus barbouri · Authority: Jordan & Richardson, 1908 · Taxonomic status: accepted · AphiaID: 275186.

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=275186 (CC BY 4.0). Accessed 2026-09-25.

Biology and life history (FishBase)

Measured values published by FishBase for Hippocampus barbouri. Only fields the database actually holds for this species are shown; these are database values, not aquarium guidance.

Maximum length: 15 cm · Depth range: 0–12 m · Habitat zone: reef-associated · Body shape: other · Vulnerability index: 10 of 100 · Fishery importance: subsistence fisheries · Aquarium trade: commercial.

FishBase notes: Unlike most seahorses, this species is often found clinging to hard coral and doesn't seem to be worried about stingers (Ref. 48635). Ovoviviparous (Ref. 205).

The male carries the eggs in a brood pouch which is found under the tail (Ref. 205). Popular spiny seahorse in aquarium trade; often sold bleached for traditional Chinese medicine. OT=height length. Minimum depth reported taken from Ref. 128812.

Source: FishBase species summary (SpecCode 53789) — https://www.fishbase.se/summary/Hippocampus-barbouri.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-25.

Distribution and occurrence records (GBIF)

136 georeferenced occurrence records for Hippocampus barbouri are published through GBIF from 7 countries or marine areas. The map above plots 21 distinct locations from a sample of 136 records, omitting 10 inland records that carry an institution's coordinates rather than a collection site; it shows where the species has been observed and reported, not a modelled range.

Most records by country or area: China (110); Philippines (12); Indonesia (9); Malaysia (2); Australia (1); Brazil (1); United States of America (1).

Source: GBIF Occurrence Search (taxonKey 5201036) — https://www.gbif.org/occurrence/search?taxon_key=5201036&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=275186 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-25.

Conservation status (IUCN Red List)

The IUCN Red List assesses Hippocampus barbouri Jordan & Richardson, 1908 as Vulnerable (code VU). No trend, population estimate or threat analysis is given here, because none is available from this source without the Red List API; follow the source link for the full assessment, including its date.

Source: IUCN Red List of Threatened Species (taxon 40802) — https://www.iucnredlist.org/species/40802/0; GBIF IUCN Red List category endpoint (taxonKey 5201036) — https://api.gbif.org/v1/species/5201036/iucnRedListCategory. Accessed 2026-09-25.

Description and natural history (Wikipedia)

Hippocampus barbouri is found in seagrasses and shallow waters off the coasts of the Philippines, Malaysia, and Indonesia. Individuals have been recorded at a maximum depth of 10 m. The Barbour's Seahorse is native to Indonesia (Bali, Jawa, Kalimantan, Sulawesi), Malaysia (Sabah), and the Philippines. Habitats include seagrass beds, mangrove swamps, estuaries, and muddy areas.

Population

Records show a 30% decline in the H. barbouri population over the past 10 years, which has continued to increase due to over fishing and the destruction of seagrass habitats. Exact numbers are unknown but percentage estimates can be made using fishing records.

H. barbouri is classified as Vulnerable by the 2017 IUCN red list assessments. They were first put on the Red list in 1996. Respondents at various levels of trade (including fishers, buyers, wholesalers, retailers, exporters and officials) in 1998 and 1999 in Malaysia reported declines in seahorse numbers and availability and that H. barbouri was one of the most common species traded.

Feeding and identification

The Barbour's seahorse feeds on small shrimp, crustaceans, calanoid copepods and decapod larvae, but has also been known to ingest the larvae of polychaetes and fish.

Individuals have well-developed spines such as their sharp eye, nose, and double cheek spine. The longest and broadest of the spines is its first dorsal spine. Its tail is relatively short in proportion to its body and has a series of long and short spines along it.

They range in color from white to yellow to greenish gray to light brown, and some may have some reddish-brown spots or lines. The males usually grow to an average length of 11–15 cm where females average at 11–13 cm. It is often confused with the hedgehog seahorse, Hippocampus histrix.

Reproduction

This species is ovoviviparous, with males carrying eggs before giving birth to live young. The female deposits her eggs into the male's brood pouch. Through the pregnancy the pair strengthens their pair bonds with daily greetings.

The gestation period for H. barbouri is 12–14 days, with a typical brood size of about 10–240 offspring. They give no parental care to juveniles after birth. Pairs mate monogamously, and may mate many times in a single season.

Predation

Hippocampus barbouri are most vulnerable during the juvenile stage. They use crypsis as a mechanism for survival. The spiny texture of its skin and coloration allow it to camouflage itself among the corals they associate with.

These seahorses are widely traded for traditional medicines and aquarium trading. This, along with the fact that their habitat it being destroyed, has caused their population size to continuously decrease.

The specific name honours the American zoologist and herpetologist Thomas Barbour 1884–1946.

Source: Wikipedia: Barbour's seahorse — https://en.wikipedia.org/wiki/Barbour%27s_seahorse (CC BY-SA 4.0). Accessed 2026-09-25.