Mobile
Action Join Donate
MarineBio Conservation Society Ocean Conservation Marine Life Species Database Education+Careers Projects Sponsors Contributors Photos Videos News Connect
pinterest

Leafy Sea Dragons, Phycodurus eques

Loading species photos...
Loading species photos...

Description & Behavior

Leafy sea dragons, Phycodurus eques (Günther, 1865), aka leafy seadragons or Glauert's seadragon, Phycodorus eques (Günther, 1865), and Phyllopteryx eques (Günther, 1865), get their common names from the leaf-like appendages on their bodies. Leafy sea dragons have more of the leaf-like appendages on their bodies than the closely-related weedy sea dragons. Both species resemble floating pieces of seaweed which makes them difficult for predators to find in their natural habitat. They reach a total length of 35 cm.

World Range & Habitat

These superbly camouflaged fishes, in the same Family Syngnathidae as seahorses and pipefishes, are only found in Australia's temperate waters. This species has only been recorded from the southern coastline of Australia, from Kangaroo Island, South Australia to Rottnest Island, Western Australia. These fishes live over sand patches among kelp-covered rocks below the low tide line in depths from about 3-50 m.

Feeding Behavior (Ecology)

The leafy sea dragon, Phycodurus eques, has a long pipe-like snout with a small terminal mouth. They feed on plankton, mysids and other small crustaceans. They have one of the most spectacular examples of camouflage: neither prey nor predators recognize them as a fish.

Life History

Unlike seahorses, sea dragons do not have a pouch for rearing their young. Instead, the male carries the eggs fixed to the underside of his tail from where they eventually hatch. When male sea dragons are ready to receive eggs from the female, the lower half of the tail on the male appears wrinkled. During mating, females lay 100-250 eggs onto a special 'brood patch' on the underside of the male's tails, where they are attached and fertilized. This brood patch, consisting of cups of blood-rich tissue each holding one egg, and is specifically developed by the male for use during the breeding season (August-March). The bright pink eggs become embedded in the cups of the brood patch, receiving oxygen via the cups' blood vessels. During each breeding season, male leafy sea dragons will hatch two batches of eggs. After a period of about 6-8 weeks from conception, the male 'gives birth' to miniature juvenile versions of sea dragons. As soon as a baby sea dragon leaves the safety of their father's tail, they are on their own. For 2-3 days after birth, baby sea dragons are sustained by their yolk sacs. After this, they hunt small zooplankton, such as copepods and rotifers, until large enough to hunt juvenile mysids. Sea dragons grow to a length of 20 cm after one year, reaching their mature length at two years. In the wild, young sea dragons are preyed upon by other fish, crustaceans and even sea anemones. Young sea dragons look more delicate, and are often differently colored than adults, and may hide in different types of seaweeds.

Conservation Status & Comments

The leafy sea dragon is a rare sight and a very fragile creature. Handling of any sort is discouraged due to the likelihood of injuring this animal. They do seem to enjoy having their picture taken though.

Leafy sea dragons, Phycodurus eques, are listed as Near Threatened (NT) on the IUCN Red List of Threatened Species:

NEAR THREATENED (NT)
A taxon is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for or is likely to qualify for a threatened category in the near future.

References & Further Research

Biology of Pipefishes, Pipehorses & Seadragons - Project Seahorse
Australian Museum Fish Site
Seadragons of Sydney [click here for video - 11MB] - see more at Divegallery.com

Research Phycodurus eques » Barcode of Life ~ BioOne ~ Biodiversity Heritage Library ~ CITES ~ Cornell Macaulay Library [audio / video] ~ Encyclopedia of Life (EOL) ~ ESA Online Journals ~ FishBase ~ Florida Museum of Natural History Ichthyology Department ~ GBIF ~ Google Scholar ~ ITIS ~ IUCN RedList (Threatened Status) ~ Marine Species Identification Portal ~ NCBI (PubMed, GenBank, etc.) ~ Ocean Biogeographic Information System ~ PLOS ~ SIRIS ~ Tree of Life Web Project ~ UNEP-WCMC Species Database ~ WoRMS

Search for Leafy Sea Dragons » ARKive ~ Ask.com ~ Bing ~ dmoz ~ Flickr ~ Google ~ OceanFootage ~ Picsearch ~ Wikipedia ~ Yahoo! Images ~ YouTube

Feedback & Citation

Start or join a discussion about this species below or send us an email to report any errors or submit suggestions for this page. We greatly appreciate all feedback!


~^~ surface

Help Protect and Restore Ocean Life

Help us protect and restore marine life by supporting our various online community-centered marine conservation projects that are effectively sharing the wonders of the ocean with millions each year around the world, raising a balanced awareness of the increasingly troubling and often very complex marine conservation issues that affect marine life and ourselves directly, providing support to marine conservation groups on the frontlines that are making real differences today, and the scientists, teachers and students involved in the marine life sciences. Join us today or show your support with a monthly donation.

With your support, most marine life and their ocean habitats can be protected, if not restored to their former natural levels of biodiversity. We sincerely thank our thousands of members, donors and sponsors, who have decided to get involved and support the MarineBio Conservation Society.