Asian date or bag mussel

Body contents

Asian date or bag mussel (Musculista senhousia) grows quickly and can smother seabed life. It can affect the productivity of commercial fisheries and aquaculture.

What to look for


  • brown or olive green colour
  • dark zigzag lines on outer shell
  • shiny radiating bands
  • easy to crush between the fingers
  • up to 3cm long.
Asian date or bag mussel

Where to look

Look in or around:

  • artificial surfaces
  • mud
  • rocky reefs
  • sand.

Likely habitats include:

  • shores and shallow waters, up to 20m deep.

Established pest in parts of Victoria, Tasmania, South Australia and Western Australia.

Similar native species

These native species look similar to Asian date or bag mussel. They do not need to be reported.

Cuming’s bag mussel (Musculus cumingianus)

Asian date or bag mussel


  • uniformly brown
  • shell has ribs on front and back but not centre.


  • inside sea squirts on rocky reefs.

Widespread in tropical and warm temperate Australia, such as Queensland, Western Australia, Northern Territory.

Limnoperna (formerly Xenostrobus) spp.

Asian date or bag mussel


  • colour ranges from blue to brown/black
  • smooth, elongated shell with radial markings
  • forms clusters
  • up to 4cm long.


  • attaches to rocks or shells on rocky reefs.

Known locations are southern Queensland, New South Wales, Victoria, Tasmania, South Australia, southern Western Australia.


Report it

See something unusual? Report it. Even if you’re not sure.

If you see something you think is a pest:

  • note the exact location (screenshot your map app or enable photo geotagging on your phone)
  • take a photo (use something for size reference, like a coin or note)
  • contact your state or territory authority.


Stop the spread of marine pests

Start with these simple steps:

  • Inspect and clean your boat or yacht. Make sure you check hard to reach areas.
  • Treat the hull of your boat or yacht regularly.
  • Clean and dry your fishing and diving gear after every use.

How you can stop the spread of marine pests.

Your location

Check our marine pests map.

The map shows known pests and pests to look for around Australia.

Asian date or bag mussel

Asian date or bag mussel (Musculista senhousia)

In Australia

Features: Brown or olive green shell. Dark zigzag lines on outer shell with radiating iridescent bands. Easy to crush.
Habitat: Soft sediments, hard surfaces, up to 20m deep.
Affects: Native species, fisheries and aquaculture.
Movement: Vessels, fishing equipment.