Carpet sea squirt

Scientific name

Didemnum vexillum

Image of Carpet Sea squirt. The scientific name, Didemnum vexillum. This image was taken by X. Tunon CEAB-CSIC.

Key features

Key features of Carpet sea squirt include:

  • range of colours – pinkish, tan or pale orange, greyish-white
  • grows in an encrusting manner or forms rope-like tendrils.


The Carpet sea squirt:

  • found on most hard surfaces including natural and artificial structures (marinas, moorings, etc.)
  • found in estuaries and marine waters from low tide mark to 80m.


The Carpet sea squirt:

  • overgrows and smothers native species
  • crowds out mussels and scallops
  • causes major fouling of wharf pylons, buoys, marinas, pontoons, water intake systems, aquaculture equipment, etc.

Known established populations

The Carpet sea squirt is currently not present in Victoria.

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