Current state of the Baltic Sea phytoplankton blooms Strong winds has mixed the surface waters in the northern Baltic Sea and no cyanobacterial surface accumulations occur along the Finnish coasts.
Local blooms can still occur in sheltered bays.
The cyanobacterial bloom period appears to be over for this year, but if weather conditions again become favourable blooms might appear, although not of the same magnitude as during July and August. Blooms in the Baltic Sea on the 25. Numerous blooms also occur in the Danish Sounds. Odra and Wistula have not moved far into the Baltic Sea. The phytoplankton was dominated by centric diatoms in the Pomeranian Bay while freshwater species such as Pediastrum, Scenedesmus and Melosira dominated in the Gulf of Gdansk Chlorophyll concentrations over 20 mg m -3 were measured.