Aquatic invasive species

DIDEMNUM

(Didemnum vexillum)

Didemnum is an invasive colonial tunicate native to the Pacific. It has not yet been observed in eastern Canada, although it is present nearby on the eastern coast of the United States.

HABITAT

See the habitat of the tunicates

Didemnum - SABS  J. Martin
SABS J. Martin

CHARACTERISTICS

Didemnum - USGS  P. Valentine - D. Blackwood
USGS
P. Valentine - D. Blackwood
  • Dense colonies that ressemble pancake batter
  • Colour variable: white, cream, yellow or light brown;
  • Forms carpets or hanging lobes.

SIMILAR SPECIES

Sponge  - DFO  R. Larocque
Sponge
DFO R. Laroque

Didemnum can be mistaken for other invasive tunicates such as the violet tunicate, but Didemnum do not come in red or orange.

It may resemble certain types of sponges, but their texture is gelatinous rather than spongy.

ECOLOGICAL AND ECONOMIC IMPACTS

Didemnum - G. King
G. King
Didemnum - USGS  P. Valentine - D. Blackwood
USGS
P. Valentine -
D. Blackwood

WHAT YOU CAN DO