Both the species diversity and total cell numbers were higher at Släggö (coastal station) than at Å17 (outer sea) at the time of sampling. Diatoms dominated at both stations and predominantly Guinardia flaccida was found. This species also dominated in the fluorescence peaks that were sampled. The two stations in the Kattegat contained few cells and the biodiversity was generally low. The fluorescence peaks found mainly contained the diatom Guinardia flaccida. The integrated (0-10 m and 0-20 m) chlorophyll concentrations were low but within normal for the month at all phytoplankton stations along the west coast. Both species diversity and cell numbers were normal for the Baltic Sea stations. Smaller dinoflagellates of the order Gymnodiniales spp., Heterocapsa triquetra, the filamentous cyanobacteria Aphanizomenon flosaquae as well as several smaller colony-forming cyanobacteria were present in relatively high cell numbers. The integrated chlorophyll (0-10 m and 0-20 m) were within normal for this month at all stations.