The Baltic Sea is home not only to sprat, flounder and blue mussels but also to many rare species and habitats that have significant role in preserving the ecological balance of the sea.
Läänemeri on koduks mitte üksnes kilule, lestale ja rannakarbile, vaid ka paljudele haruldastele liikidele ja elupaikadele, millel on tähtis roll mere ökoloogilise tasakaalu säilimisel.