White colonial sea squirt

Scientific name

Didemnum perlucidum

Image of White colonial sea squirt. The scientific name, Didemnum perlucidium. This image was taken by C. Trewin.

Key features

Key features of White colonial sea squirt include:

  • white colouring
  • grows in an encrusting manner or forms rope-like tendrils.


The White colonial sea squirt:

  • hard surfaces particularly artificial structures (marinas, moorings, etc.)
  • found in estuaries and marine waters
  • commonly found 1-3m deep but can be up to 8m deep.


The White colonial sea squirt:

  • overgrows native species
  • causes major fouling of wharf pylons, buoys, marinas, pontoons, water intake systems, aquaculture equipment, etc.

Known established populations

The White colonial 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