This report offers results from two August cruises. The phytoplankton diversity was low in the Skagerrak and the Kattegat areas. Merely small species were found in high cell numbers, i.e. the coccolithophorid Emiliania huxleyi, known to colour the ocean turquoise when blooming. The chlorophyll a concentrations were within normal in the areas except at N14 where the concentration was below the detection limit. Small species dominated the Baltic samples. Filamentous cyanobacteria were common at BY5, BY15, BY38 and RefM1V1. The highest numbers of cells and species were found at RefM1V1, where colonies of pico cyanobacteria dominated. The chlorophyll a concentrations were within normal for this month.