Marine life

Weedy Seadragon

Phyllopteryx taeniolatus

The leafy's more widespread cousin — the signature animal of Sydney and Victorian shore diving.

Weedy seadragons are the animal that makes temperate Australian shore diving worth the cold. Reddish-orange with yellow spots and electric blue bars, they hang in the water column above weed and sand, moving with almost imperceptible fin beats.

They are considerably more widespread than the leafy seadragon, occurring right along the southern coast from Sydney to Western Australia, which puts them within reach of a shore dive for millions of people.

Bare Island in Sydney and Flinders Pier in Victoria are the two best-known sites, and both are shore entries. Flinders in particular has a reputation as the most reliable weedy seadragon site in the country.

Victorian pier diving, represented by an AI-generated editorial image.

Scientific name	Phyllopteryx taeniolatus
Typical size	Commonly 30–45 cm
Conservation status	Protected; listed as endangered
Peak months	September, October, November
Documented sites	10
States	New South Wales, Victoria, Tasmania, South Australia

When to see them

possible good peak

Resident year-round along the southern coast. Egg-carrying males are most commonly seen in spring and early summer.

Where they are

Documented sites for Weedy Seadragon. Hover a marker for the site name.

Identification

reddish-orange body with yellow spots and blue-purple bars
leaf-like appendages present but far fewer and smaller than a leafy seadragon's
long tubular snout
no prehensile tail
typically hovering just above weed, sand or seagrass

Behaviour

Feeds on mysid shrimp and small crustaceans.
Males brood eggs on the underside of the tail.
Individuals are often site-faithful, returning to the same patch over long periods.

In-water etiquette

Weedy Seadragon is protected; listed as endangered. How divers behave around it genuinely matters.

Never touch, move or handle.
Limit strobe flashes per animal.
Keep fins up and buoyancy neutral — these are silty sites.
Do not herd or corner an animal to position it for a photograph.

Where to see them

Sites where this species is documented as a reliable encounter.

Bare IslandSydney's most-dived shore site — weedy seadragons, extraordinary macro life and multiple routes.KurnellA cluster of Botany Bay shore dives including The Steps and The Leap, with wall terrain.Flinders PierA Western Port pier with one of Victoria's most reliable weedy seadragon populations.Blairgowrie PierVictoria's most popular pier dive, and the best-known site for giant spider crab aggregations.Rye PierA shallow, sheltered pier known for seahorses, seadragons and night diving.Port Phillip PiersThe bay's network of pier dives — the accessible heart of Victorian diving.Jervis Bay WallsTemperate sponge-covered walls and drop-offs in some of the clearest water in NSW.D'Entrecasteaux ChannelSheltered channel diving near Hobart, with jetties, reefs and handfish habitat.Rapid Bay JettySouth Australia's best-known leafy seadragon site, beneath a long jetty on the Fleurieu Peninsula.Second ValleyDramatic rock formations and a sheltered shore entry on the Fleurieu Peninsula.

Operators servicing those sites

Businesses documented as diving the sites above. Confirm seasonality and requirements directly.

Abyss Scuba DivingA Sydney operation associated with training across recreational and technical levels, boat diving and equipment services.Diving AdelaideAn Adelaide training and guided diving operation serving local sites and organised trips.

Often seen on the same dives

Australian & New Zealand Fur SealsFast, acrobatic and endlessly curious — the highlight of Montague Island, Jervis Bay and Port Phillip.Eastern Blue GroperNew South Wales' state fish — large, inquisitive and often the first thing to greet a Sydney shore diver.Giant Australian CuttlefishThe world's largest cuttlefish, gathering in tens of thousands at Whyalla each winter.Giant Kelp ForestTasmania's underwater forests — dramatically diminished, and worth seeing while they remain.Giant Spider CrabTens of thousands of crabs piling into the shallows of Port Phillip Bay to moult, in one of Victoria's strangest dives.Leafy SeadragonSouth Australia's emblem and the most elaborately camouflaged fish in the world.

Frequently asked questions

Where is the best place to see weedy seadragons?

Flinders Pier in Victoria and Bare Island in Sydney are the two most reliable sites, and both are shore dives.

Are weedy seadragons endangered?

They are protected and listed as endangered. Habitat loss and warming water are the main pressures, which is why site etiquette matters.

Last researched: September 2026. Dive businesses change frequently — confirm current services, prices and requirements directly with the operator before booking.