Cover picture: Technicians Andreas Taverna and Danina Schmidt from the Eawag Fish Ecology and Evolution research department in Kastanienbaum take water samples in Lake Lucerne from the Eawag research vessel "Perca". To do this, they slowly lower a Schroeder flask to 20 metres and quickly raise it again. A defined amount of water collects in the bottle per metre of water depth. These composite samples can be used to collect important data on algae composition, for example, and thus analyse the productivity of the lake.
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