Two types of stations were occupied: CTD hydrocast stations for water chemistry and continuous vertical profiles of chemical parameters in the upper 200 meter layer (SHET profiles). Selected biological stations were carried out mainly for primary productivity (in situ super(14)C method), phytoplankton biomass and photometric measurements (quantum- and spectroirradiance-meters) in the photic zone. Zooplankton was collected at nearly all the stations of the cruise in order to determine biomass and species composition. A long Peru-Galapagos connecting section with 19 stations was carried out for water chemistry down to 2000 meters.