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Weedy Seadragons Melbourne

Weedy Seadragons Melbourne by The Scuba Doctor

In the waters of the Mornington Peninsula, south of Melbourne, you can see one of the most unique and beautiful life forms in the ocean — the Weedy Seadragon! Whether you're snorkelling or scuba diving, you can discover their underwater world and get up close and personal with these magnificent marine creatures.

The only place on earth Weedy Seadragons are found is in the waters of southern Australia. Weedy Seadragons, or Common Seadragons, are the Victorian state marine emblem. Unfortunately, they are also listed as 'near threatened' by the International Union for the Conservation of Nature, putting them in the same category as the White Rhino and the Eastern Bettong.

Weedy Seadragon, Flinders Pier
Weedy Seadragon, Flinders Pier
© Sam Glenn Smith
Weedy Seadragon, Flinders Pier
Weedy Seadragon, Flinders Pier
© Sam Glenn Smith
Weedy Sea Dragon (Fizzy), Flinders Pier
Weedy Sea Dragon (Fizzy), Flinders Pier
© Sam Glenn Smith

Our favourite place to go and see Weedy Sea Dragons is Flinders Pier, located just inside Western Port. Flinders Pier is arguably the easiest place in the world to find these iconic marine creatures. The BBC Natural History Film Unit spent three weeks at Flinders Pier in January 2016 to get footage of Weedy Sea Dragons for episode 5 'Green Seas' of the documentary Blue Planet II. There are dozens of them here and during the right season you might see the males carrying eggs around.

Maximum depth across the pier is 7 metres, though interesting flora and fauna can still be found at shallower depths of 1 to 3 metres, making this an enjoyable site for snorkellers and divers alike.

Weedy Sea Dragon, Portsea Pier
Weedy Sea Dragon, Portsea Pier
© Sam Glenn Smith

The next best place to see Weedy Seadragons would be Portsea Pier. Unfortunately Portsea Pier has been somewhat ruined as a dive site by the Port Phillip channel deepening programme carried out by the Port of Melbourne in 2009. Since the dredging, the swells at Portsea Pier are more frequent and more intense.

You can also sometimes find Weedy Seadragons at Rye Pier, and Blairgowrie Pier. But Flinders Pier is our recommendation.

Weedy Seadragon Guided Dives

The Scuba Doctor offers Morning 9am, Afternoon 1pm and Night 6pm Guided Dives to see the Weedy Seadragons at Flinders Pier! Please email or call for availability.

Dragon Quest

Weedy Sea Dragon (Fizzy), Flinders Pier
Weedy Sea Dragon, © Victoria National Parks Association
Wanted: Dragon Quest
Wanted: Dragon Quest
© Victoria National Parks Association

The Victoria National Parks Association is on a Dragon Quest mission to determine the population of Weedy Seadragons around Port Phillip and Western Port. All you need to do to help is submit images that have clear side profile shots of Weedy Seadragons and let them know where and when it was from. Images can be from any time in the last 10 years.

Please see Dragon Quest for more information and download the guide How to Take Photos of Dragons (Adobe PDF | 649.15 KB). They are fully protected under Commonwealth Law (1999) and the Victorian Fisheries Act 1995, so please no harming or handling of them at any time.

The reward is having a Weedy Seadragon named after you if you are the first to find it!

Weedy Seadragon Details

Victorian Marine Emblem: Weedy Seadragon
Victorian Marine Emblem: Weedy Seadragon

The Weedy Seadragon or Common Seadragon, Phyllopteryx taeniolatus, is a member of the Syngnathidae family which includes seahorses, pipehorses and pipefish.

It's found only in southern Australian waters, living in coastal waters from Newcastle (NSW) to Tasmania and Geraldton (WA) with its range centred around Victoria.

The Weedy Seadragon (also Common Seadragon) was selected as Victoria's official marine faunal emblem by public nomination in 2002.

Weedy Seadragons are beautifully coloured, dainty, timid animals that swim slowly and gracefully. Tiny fins are found on either side of their head for balance and a long shimmering dorsal fin along their back propels their body through the water. They are, however, not strong swimmers and are often found washed ashore after storms.

Weedy Seadragon Habitat

Forests of brown kelp and seagrass meadows (mainly Amphibolus sp.) are vital habitat for the survival of Weedy Sea Dragons in shallow waters. In deeper waters they prefer to live amongst offshore reefs containing sponge gardens and brown kelp.

Long leaf-shaped flaps of skin protrude from stalk-like bony projections at intervals along the top and bottom of the body. This enables seadragons to perfectly camouflage within their habitat and be easily overlooked.

Weedy Seadragon Life Cycle

Breeding occurs annually, usually starting in late Spring when the seadragons pair up. Like their pipefish and seahorse relatives, the male seadragon broods the eggs.

With Weedy Seadragons, up to 300 eggs can be laid by the female underneath the male's tail where they are brooded. The eggs are bright pink when fresh and darken as they develop.

Male Weedy Seadragon with eggs, Flinders Pier
Male Weedy Seadragon with eggs, Flinders Pier, © Divemaster Sam Glenn-Smith

They hatch, after 2 months, as 25 mm long miniature versions of the adults, but grow quickly to 7 cm within about 3 weeks. Sometimes the adult males receive another batch of eggs. Thus the period where the males might be seen with eggs typically goes from around October through to March.

By 4 months they are about one quarter of the length of an adult and after 2 years have reached their maximum size of up to 46 centimetres in length.

Weedy Seadragons can probably live up to 10 years in the wild.

Weedy Seadragon Diet

Their diet consists mainly of small crustaceans. The young feed almost exclusively on mysid shrimp. Adults will feed on mysids, other small shrimp and crawling crustaceans, including squat lobsters.

Using its long thin tubular snout the Weedy Seadragon captures food by a powerful suction action, drawing water and prey rapidly into its mouth. Special muscles in the snout can widen it to capture different sizes of food.

Weedy Seadragon Conservation Status

The Weedy Seadragon, as part of the Syngnathidae family, is fully protected as 'Protected Aquatic Biota' under the Victorian Fisheries Act 1995.

Where can Victorians experience the world of Weedy Seadragons?

In the wild, if you look carefully, you may be rewarded with a view of this amazing creature hovering around piers near clumps of brown kelp, along the edges of seagrass beds and in deeper water amongst sponges and brown kelp forests on offshore reefs.

Snorkellers and divers can observe Weedy Seadragons in many of the Marine National Parks and Marine Sanctuaries situated along Victoria's coast, near Portland, Point Addis, Queenscliff, Barwon Heads, Portsea, Rye, Flinders, Wilsons Promontory and Gippsland.

More information

For more information about Melbourne's Weedy Seadragons, please join the Facebook group Weedy Seadragons Melbourne.

Find out more about the Weedy Sea Dragon please see
Australian Museum: Common Seadragon,
Atlas of Living Australia: Common Seadragon, and
Wikipedia: Common Seadragon.

You can also read/download the Parks Victoria Park Notes: Weedy Seadragons (Adobe PDF | 361.67 KB) and the Parks Victoria Leaning Resource: Weedy Seadragon (Adobe PDF | 11.24 MB).

If you would like someone to show you our Weedy Seadragons, please chek out our Guided Dives page. If you need scuba gear to go and see the Weedy Seadragons, please take a look at our Scuba Equipment Rental page.


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