The bryozoans clearly love their seaweed. Hitching a permanent ride on kelps and other seaweeds has many advantages for these tiny animals.
The constant motion provided by the host not only provides added access to food particles, but also a defense against predators. Living right on an oxygen source, with each cell of kelp exhaling oxygen ready for the animal’s respiratory needs, is also a bonus.
Pictured: Palmaria palmata (dulse) with bryozoan colony