Extensive areas of subtidal seagrass (Zostera marina) can be found near the entrance to the Yealm, Cawsand Bay, and around Drake’s Island. Seagrass areas in the site provides vital habitat for species including hydroids, juvenile fish, cuttlefish, and two types of stalked jellyfish in the Yealm (Lucernariopsis campanulata and a Haliclystus sp.). Seagrass also acts as a natural carbon sink, and can remove 35 times more CO₂ than an equivalent sized area of rainforest. Seagrass is delicate and very vulnerable to the impacts of anchors, and anchoring and mooring chains.

Designated as a sub-feature of the Special Area of Conservation (SAC)

Image © Paul Naylor