Posidonia oceanica is protected by EU legislation (Habitat directive), the Bern and Barcelona Conventions and national legislation (Spain, Algeria, etc.). Fishing regulations limit trawling activities near the shore (either above 50 m or a certain distance from the coast), which constitute an indirect protection measure for the species (EC Council Regulation N° 1967/2006 and national regulations).
Posidonia oceanica is present in various marine parks in the countries along the Mediterranean Sea (Green and Short 2003). Efforts have been made to prevent physical damage caused by trawler-fishing by placing artificial reefs, consisting of spiked concrete blocks, along certain stretches of the coast, and also by mounting a coastal watch to prevent illegal trawling.
Research into potential species conservation plans is needed, as is site protection and management, habitat restoration, increased awareness, and legislation at local, national and international levels.