Sea Squirt
A solitary tunicate and prolific biofouler in European waters. Populations can explode in warm months, smothering shellfish and blocking water…
Organism Type: Sea Squirts
Star Ascidian
A colonial sea squirt that forms star-shaped patterns. Particularly problematic for shellfish aquaculture as it can completely encrust mussels and…
Club Tunicate
A large solitary sea squirt originally from the northwest Pacific, now invasive across northern Europe. Styela clava attaches to mussel…
European Sea Squirt
A solitary tunicate common across European Atlantic waters. Ascidiella grows on cage nets, shellfish bags, and ropes, and often appears…