Northern Pacific Seastar (Asterias amurensis)
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Key Features
Five arms with pointed upturned tips.
Mature Seastars:
- have 5 arms with pointed tips which are upturned at the end
- are mainly yellow but may have purple detail
- are covered in many small spines with jagged ends that are arranged irregularly along arms.
Northern Pacific Seastar
Asterias amurensis
(CRIMP - CSIRO Marine Research)
Which Native Seastars Look Similar?
There are two native seastars that look similar,
Coscinasterias muricata (11 arms) and
Uniophora granifera, but these native seastars have arms with rounded tips.
Northern Pacific Seastar
Asterias amurensis
(Photograph by CRIMP - CSIRO Marine Research)
Native seastar
Coscinasterias muricata
(Photograph by Terence Bogue Tasmanian Museum and Art Gallery)
Uniophora granifera
(Photograph by Terence Bogue Tasmanian Museum and Art Gallery)
Habitat:
- coastal areas not exposed to high wave action (eg estuaries and deep water)
- soft sediment and reef from intertidal to depths of up to 200 metres
- often in disturbed habitats (eg wharfs and yacht clubs).
Distribution

Populations are found from Banks Strait in the north to Recherche Bay in the south. The highest population densities are found in the Derwent estuary (Hobart).
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/wash shellfish and clean/dry aquaculture gear before transporting to a different lease
- report sightings of Asterias to the Marine Environment contact officer.
Further Information: