Leafy seadragon (Phycodurus eques)

Classification (WoRMS)

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

Accepted name: Phycodurus eques · Authority: (Günther, 1865) · Taxonomic status: accepted · AphiaID: 282248.

Synonyms and superseded combinations recorded for this taxon: Phycodorus eques (Günther, 1865); Phyllopteryx eques Günther, 1865.

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=282248 (CC BY 4.0). Accessed 2026-09-23.

Biology and life history (FishBase)

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

Maximum length: 35 cm · Depth range: 4–30 m · Habitat zone: reef-associated · Body shape: other · Vulnerability index: 17.9 of 100 · Fishery importance: of no interest · Aquarium trade: commercial.

FishBase notes: Usually occur over sand patches close to reefs with kelp, feeding on mysids and other crustaceans. Ovoviviparous (Ref. 205). The male carries the eggs in a brood pouch which is found under the tail (Ref. 205). One of the most spectacular examples of camouflage: neither prey nor predators recognize it as a fish.

Source: FishBase species summary (SpecCode 15908) — https://www.fishbase.se/summary/Phycodurus-eques.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-23.

Distribution and occurrence records (GBIF)

1,409 georeferenced occurrence records for Phycodurus eques are published through GBIF from 3 countries or marine areas. The map above plots 37 distinct locations from a sample of 1,409 records, omitting 19 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: Australia (1,407); Kenya (1); Malaysia (1).

The full country table, WoRMS marine regions and the sampling notes are on this species' Distribution page.

Source: GBIF Occurrence Search (taxonKey 2332986) — https://www.gbif.org/occurrence/search?taxon_key=2332986&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=282248 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-23.

Conservation status (IUCN Red List)

The IUCN Red List assesses Phycodurus eques (Günther, 1865) as Least Concern (code LC). 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 17096) — https://www.iucnredlist.org/species/17096/0; GBIF IUCN Red List category endpoint (taxonKey 2332986) — https://api.gbif.org/v1/species/2332986/iucnRedListCategory. Accessed 2026-09-23.

Description and natural history (Wikipedia)

It is found along the southern and western coasts of Australia. The name is derived from their appearance, with long leaf-like protrusions coming from all over the body. These protrusions are not used for propulsion; they serve only as camouflage. The leafy seadragon propels itself utilising a pair of pectoral fins on the sides of its neck and a dorsal fin on its back closer to the tail end. These small fins are almost completely transparent and difficult to see as they undulate minutely to move the creature sedately through the water, completing the illusion of floating seaweed.

Popularly known as "leafies", they are the marine emblem of the state of South Australia and a focus for local marine conservation.

The generic name is derived from the Ancient Greek words φῦκος (phûkos) "seaweed", and δέρμα (dérma] "skin". The word eques is derived from the Latin equus, meaning horse.

Much like the seahorse, the leafy seadragon's name is derived from its resemblance to another creature (in this case, the mythical dragon). They are slightly larger than most seahorses, growing to about 20 – 24 cm. They feed on plankton and small crustaceans.

The lobes of skin that grow on the leafy seadragon provide camouflage, giving it the appearance of seaweed. It is able to maintain the illusion when swimming, appearing to move through the water like a piece of floating seaweed. It can also change colour to blend in, but this ability depends on the seadragon's diet, age, location, and stress level.

The leafy seadragon is related to the pipefish and belongs to the family Syngnathidae, along with the seahorse. It differs from the seahorse in appearance, form of locomotion, and its inability to coil or grasp things with its tail. A related species is the weedy seadragon, which is multicoloured and grows weed-like fins, but is smaller than the leafy seadragon. Another unique feature is the small, circular gill openings covering tufted gills, very unlike the crescent-shaped gill openings and ridged gills of most fish species.

The leafy seadragon is found only in southern Australian waters, from Wilson's Promontory in Victoria at the eastern end of its range, westward to Jurien Bay, 220 km north of Perth in Western Australia. Individuals were once thought to have very restricted ranges; but further research has discovered that seadragons actually travel several hundred metres from their habitual locations, returning to the same spot using a strong sense of direction. They are mostly found over sand patches in waters up to 50 m deep, around kelp-covered rocks and clumps of seagrass. They are commonly sighted by scuba divers near Adelaide in South Australia, especially at Rapid Bay, Edithburgh, and Victor Harbor.

Leafy seadragons usually live a solitary lifestyle. When the time comes, males court the females, they then pair up to breed. From the moment they hatch, leafy seadragons are completely independent. By the age of two years, they are typically full grown and ready to breed.

The species feeds by sucking up small crustaceans, such as amphipods and mysid shrimp, plankton, and larval fish through its long, pipe-like snout.

As with seahorses, the male leafy seadragon cares for the eggs. The female produces up to 250 bright pink eggs, then deposits them onto the male's tail with her ovipositor, a long tube. The eggs then attach themselves to a brood patch, which supplies them with oxygen. After 9 weeks, the eggs begin to hatch, depending on water conditions. The eggs turn a ripe purple or orange over this period, after which the male pumps his tail until the young emerge, a process which takes place over 24–48 hours. The male aids the hatching of the eggs by shaking his tail, and rubbing it against seaweed and rocks. Once born, the young seadragon is completely independent, eating small zooplankton until large enough to hunt mysids. Only about 5% of the eggs survive. Each newborn fry begins life with a small, externally-attached yolk-sac. This sac provides them sustenance for their first few days of life. Despite this initial nutrition source, the majority of fry will instinctively learn to hunt and catch prey upon hatching, and will become self-reliant before the sac is gone.

The leafy seadragon uses the fins along the side of its head to allow it to steer and turn. However, its outer skin is fairly rigid, limiting mobility. Individual leafy seadragons have been observed remaining in one location for extended periods of time (up to 68 hours), but will sometimes move for lengthy periods. The tracking of one individual indicated it moved at up to 150 m per hour.

Leafy seadragons are subject to many threats, both natural and man-made. They are caught by collectors, but unlike other syngnathid fish, are not used in alternative medicine. They are vulnerable when first born, and are slow swimmers, reducing their chance of escaping from a predator. Seadragons are sometimes washed ashore after storms.

The species has become endangered through pollution and industrial runoff, as well as collection for the aquarium trade. In response to these dangers, the species has been totally protected in South Australia since 1987, Victoria since at least 1995, and Western Australia since 1991. Additionally, the species' listing in the Australian government's Environment Protection and Biodiversity Conservation Act 1999 means that the welfare of the species has to be considered as a part of any developmental project.

Source: Wikipedia: Leafy seadragon — https://en.wikipedia.org/wiki/Leafy_seadragon (CC BY-SA 4.0). Accessed 2026-09-23.

In the aquarium (Wikipedia, cited section)

Due to being protected by law, obtaining seadragons is often an expensive and difficult process as they must be from captive bred stock, and exporters must prove their broodstock were caught before collecting restrictions went into effect, or that they had a license to collect seadragons. Seadragons have a specific level of protection under federal fisheries legislation as well as in most Australian states where they occur. Seadragons are difficult to maintain in aquaria. Success in keeping them has been largely confined to the public aquarium sector, due to funding and knowledge that would not be available to the average enthusiast. Attempts to breed the leafy seadragon in captivity have so far been unsuccessful.

Australia Australian aquaria featuring leafy seadragons include the Sydney Aquarium, the Melbourne Aquarium, and the Aquarium of Western Australia.

Canada Ripley's Aquarium of Canada in Toronto displays both leafy and weedy seadragons.

South East Asia S.E.A. Aquarium, located in the Marine Life Park of Singapore, displays both leafy and weedy seadragons.

United States

A number of aquaria in the United States have leafy seadragon research programs or displays. Among these are the Adventure Aquarium in Camden, New Jersey; Aquarium of the Pacific at Long Beach; Birch Aquarium in San Diego; the Minnesota Zoo; Monterey Bay Aquarium; the Dallas World Aquarium & the Dallas Children's Aquarium, Dallas; the New England Aquarium, Boston; the Point Defiance Zoo & Aquarium in Tacoma, Washington; the Newport Aquarium in Kentucky,[citation needed] the Shedd Aquarium, Chicago; the California Academy of Sciences; the Tennessee Aquarium; Sea World Orlando, Florida; the Pittsburgh Zoo & PPG Aquarium; Ripley's Aquarium of the Smokies, Gatlinburg, Tennessee;[citation needed] the Florida Aquarium in Tampa, Florida; the Mote Aquarium in Sarasota, Florida;[citation needed] and Ripley's Aquarium Broadway at Myrtle Beach, South Carolina.[citation needed]

Europe The Lisbon Aquarium (Lisboa Oceanarium) has both leafy sea dragons and weedy sea dragons.

This block reproduces what the species' own Wikipedia article states about it in captivity, with that article's 57 inline citations. No care parameters — tank size, temperature, reef-safety, temperament — are published by any of the databases used on this page, and none have been added.

Source: Wikipedia: Leafy seadragon — section "In captivity" — https://en.wikipedia.org/wiki/Leafy_seadragon (CC BY-SA 4.0). Accessed 2026-09-23.