Seagrass grows on sandy bottoms of shallow seas and are important habitat of many organisms, including some fish species on which Mediterranean Shags feed.
Slovenian sea is a home to four species of grasses:
- Mediterranean tapeweed (Posidonia oceanica),
- Lttle Neptune grass (Cymodocea nodos),
- Common eelgrass, Seawrack (Zostera marina) and
- Dwarf eelgrass (Nanozostera noltii)
Mediterranean tapeweed, an endemic species of the Mediterranean, used to covering a great part of the Gulf of Trieste decades ago. After 1960 a dramatic decline of tapeweed occured, and today, there is only one seagreass bed of this species in the Gulf of Trieste left: it grows in protected area of sea along the coastal main road between the towns of Koper and Izola.