Leväkukintatilanne Suomen merialueilla ja varsinaisella Itämerellä

12
Rantajärvi (ed.) MERI No. 36, 1998
On Åland, in the brackish water of lake Vargsundet-Ösundet, an intensive bloom of the haptophyte
Prymnesium parvum occurred in early July causing a massive fish kill (Tore Lindholm, Petra Öhman,
Husö Biological station).
TOXICITY OF THE BLOOMS
The samples collected onboard ferries made possible the monitoring of algal toxins in large sea areas
(Figure 3 on page 9). The cyanobacterial blooms were verified to be toxic (mainly the hepatotoxin
nodularin) in the whole Baltic Sea area. Large amounts of blue-green algal biomass drifted ashore,
particularly along the whole northern coastline in the Gulf of Finland and in the Archipelago Sea. In
Finland two dogs died due to cyanobacterial poisoning and 166 people and several animals suffered
symptoms of cyanobacterial poisoning (sea and lakes, Poison Information Centre, Helsinki).
A cyanobacterial poisoning of one dog was reported from the island of Gotland in July (Gunnar
Aneer, Stockholm).
A massive fish kill occurred in the brackish water of lake Vargsundet-Ösundet on Åland in early July
apparently caused by Prymnesium parvum (Tore Lindholm, Petra Öhman, Husö Biological station).