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Bladder Wrack (Fucus vesiculosus)
Bladder wrack 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.
Bladder wrack has male and female reproductive fronds. They reproduce by releasing eggs and sperm into the water, and they do it mainly two days before full and new moon.
Bladder wrack is widespread in the Gulf of Riga, the West Estonian Archipelago and the Gulf of Finland.
Bladder wrack (Photo: Darius Daunys)