Northern Pacific seastar (Asterias amurensis)

What to look for

  • 5 arms with pointed upturned tips.
  • Yellow/orange with purple markings & yellow underneath.
  • Up to 50cm across.


  • Soft sediment but also artificial structures & rocky reefs.
  • Estuaries, bays, rock pools.
  • Intertidal to 200 m depth (usually <25m depth).
  • Prefers temperate but adapted to warmer waters.


  • Aggressive predator of native species & economically important bivalves.
  • Impacts aquaculture & fisheries.

Current locations 

  • Port Phillip Bay Victoria
  • South-east to north east coast from Researche Bay to Binnalong Bay and Banks Strait, Tasmania

What you can do

  • Inspect & clean niche areas & antifoul boat hulls regularly.
  • Clean & dry equipment before transporting & using in a different location.
  • Ensure all aquaculture livestock is pest free.  

More information

More information on this pest can be found on the National Introduced Marine Pest Information System

Report a sighting

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