Undaria (Wakame)



Key Features

A frilly sporophyll and a mid-rib.

Mature Plants

  • are brown and up to 2 metres long
  • have a mid-rib that runs along the centre of the plant
  • have a frilly sporophyll near the holdfast.

Colour photograph of Wakame (Undaria pinnatifida) plant. 

Undaria (Wakame)
(Photograph by CRIMP - CSIRO Marine Research)


 

Which Native Plants Look Similar?

The kelp Ecklonia radiata but the native plants do not have a mid-rib or a frilly sporophyll.

Colour photograph showing close-up of the sporophyll (base) of wakame (undaria pinnatifida) plant. 
Undaria sporophyll
(Photograph by CRIMP - CSIRO Marine Research)


Colour photograph showing mid rib of Wakame (Undaria pinnatifida) plant. 
Undaria mid-rib
(Photograph by Kate Neill, Te papa)


Colour photograph showing Ecklonia radiataplant. 
Native Kelp Ecklonia radiata
(Photograph by Kate Neill, Te papa)


Habitat:

  • from intertidal to depths of about 20 metres
  • on hard surfaces (eg reefs, rocks, shells, ropes, wharf piles, ship hulls)
  • can form dense 'forests' in sheltered areas.

Distribution:

Map of Tasmania indicating in red the distribution of Undaria on the East coast from Great Oyster Bay to the D'Entrecasteaux Channel and in Georges Bay.
Undaria is distributed on the East coast from Great Oyster Bay to the D'Entrecasteaux Channel. There is also an isolated population in Georges Bay (St Helens).

Permit Required!

To reduce the risk of further spreading this marine pest, it has been listed as a noxious species under the Living Marine Resources Management Act 1995. To collect and possess this species requires a permit which may be obtained from the Department of Primary Industries and Water by calling 6233 6208.

What Can You Do:

  • clean and anti-foul boat hulls regularly
  • clean and dry dive and fishing gear after use
  • report sightings of Undaria to the Marine Environment contact officer.

Further Information:

Undaria Action Plan

Contact

Invasive Species Enquiries
Invasive Species Branch
Phone: 03 6165 3777
Email: invasivespecies@dpipwe.tas.gov.au

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