The phytoplankton community in both Skagerrak and Kattegat areas comprised mainly of small flagellates. The only exception was Släggö, the inner site in the Skagerrak where the diatom Dactyliosolen fragilissimus was found in highest abundance. The coccolithophorid Emiliana huxleyi was dominating at Å17 whereas the genus Chrysochromulina dominated at both stations in the Kattegat. D. fragilissimus was recorded with quite high cell numbers in the Kattegat. The integrated chlorophyll a concentrations were within normal in the Skagerrak area. The chlorophyll a concentrations where lower than normal at two stations in the Kattegat. In the Baltic Sea the phytoplankton community was dominated by small flagellates and especially by the genus Chrysochromulina. Filamentous cyanobacteria were found in moderate abundances at the stations in the southern part but not in bloom forming quantities. Only a few large species were recorded but the diatom Chaetoceros impressus was quite abundant in the southwestern and western stations. The integrated chlorophyll a concentrations were within normal in the southern part of the Baltic and below normal in the eastern and western parts.