The clubbed tunicate prefers to grow on marine structures and boat hulls, affecting your boat’s performance and hitchhiking to other places. It is disliked by the aquaculture industry because it grows in large densities on oyster and mussel lines, suffocating their shellfish, competing for space and food and adding to processing costs.

How to identify Styela clava

• Long club-shaped body

• Short, tough stalk to attach to surfaces

• Two siphons on top

• Warty/uneven surface

• Feels leathery to touch

• Brownish-white to reddish-brown