Northern pacific Seastar

Scientific name

Asterias amurensis

Image of Northern pacific Seastar.  The scientific name, Asterias amurensis. This image was taken by J. Lewis.

Key features

Key features of Northern pacific Seastar include:

  • five arms with pointed upturned tips
  • yellow/orange with purple markings, yellow underneath
  • up to 50cm across when fully grown
  • aggregates in cooler months to spawn.


The Northern pacific Seastar:

  • found in bays, estuaries and reefs from high tide mark to 200m
  • found in a range of habitats including seagrass, mussel beds, artificial structures (marinas, ports, etc.) rock pools and rocky reefs.


The Northern pacific Seastar:

  • aggressive predator of native and commercial species including mussels, oysters and scallops
  • harms biodiversity, aquaculture and fisheries.

Known established populations

The Northern pacific Seastar is currently present in Port Phillip Bay.

Report a marine pest sighting

Report any unusual marine species immediately using our online reporting system. Early reporting increases the chance of effective control and eradication. Please take good quality photos of the pests or damage to include in your report where possible.

Alternatively, you can call the Agriculture Victoria Customer Service Centre 136 186.

Report a sighting

Page last updated: 06 Jul 2023