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Baltic macoma (Macoma balthica) is a rather small mollusc. Most of these molluscs do not reach more than 3.5 cm in diameter. The shell of this bivalve mollusc is white or pinkish. If anyone has ever collected shells in sandy beaches, most of the findings could be macoma’s, since it is really abundant there.
Bladder wrack (Fucus vesiculosus) is typical seaweed of the coastal areas in the Baltic Sea. It is brown perennial macroalgae that grows in the depth of 1 to 6 metres on hard rocky bottom.
These are the most species rich ecosystems in the Baltic Sea, containing some ten species of algae and 30 animal species.
Blue mussel (Mytilus edulis) is an average-sized mollusc. It can be found in temperate and polar marine waters, also in the Baltic Sea.
Its shell has two parts. Such molluscs are called bivalve. The shell is usually smooth and elongated. Its colour is blue.
Eelgrass (Zostera marina) is the most common species of seaweed growing in the Northern Hemisphere and it is also abundant in the Estonian coastal waters and the Gulf of Riga, but there is no eelgrass growing in Lithuanian coast.
Red seaweed (Furcellaria lumbricalis) is a reddish-brown alga, which can grow up to about 30 cm in length. When growing, every branch divides into two.
In Europe, it is found from northern Norway to the Bay of Biscay, including the Baltic Sea, and also in Italy and Sardinia. In the eastern Baltic Sea, it abounds in the Gulf of Riga, the West Estonian Archipelago and the Gulf of Finland.