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In the juvenile stage, the European eel (Anguilla anguilla) still has a transparent skin – hence the name “glass eel”. Photo: European Eel Foundation
June 21, 2017

European eels (Anguilla anguilla)  take three years to migrate from the spawning grounds in the Sargasso Sea (east of Florida) to the coasts of Europe, where they grow to maturity. En route, they are guided by subtle local differences in the Earth’s magnetic field. Read more

The "Rainbow Biosystem" team with Severin Schwan (Roche) and Bundesrat Johann Schneider-Ammann (Photo: Alessandro Della Bella)
June 20, 2017

A new business idea – the “Rainbow Biosystem” – developed by researchers at Eawag received the 3rd prize in the business plan category at the award ceremony for the »venture» start-up competition on 19 June. Read more

In the fish room at Eawag: A spawning tray is placed into a tank in order to obtain zebrafish eggs for the FET (Fisch Embryo Toxicity) test.
June 13, 2017

Environmental toxicologists at Eawag have developed new methods to allow tests on new chemicals to be carried out without the need for animal experiments. In place of the conventional experiments using adult fish, the team is now working with fish cells and fish embryos. These alternative methods have numerous advantages, and are seeing increasing demand in industry. This has given rise to an Eawag spin-off. We spoke to its founders. Read more

Rotsee, © Eawag
June 7, 2017

In freshwater lakes, large amounts of the greenhouse gas methane are oxidized by bacteria before it can be emitted into the atmosphere. A study in Lakes Rotsee and Zug has now shown that the bulk of this work is done, not by “classical” methane consumers, but by filamentous bacteria previously known only as contaminants of water supplies. Read more

Fig. 1: The scientists investigated water chemistry and biology in reaches upstream and downstream of WWTPs. (Photo: Eawag)
June 1, 2017

Micropollutants enter rivers and streams in effluents discharged from wastewater treatment plants (WWTPs). As well as having adverse impacts on individual species, these substances appear to alter aquatic ecosystem functions, such as litter decomposition. This was shown by a research project launched by Eawag in view of the planned upgrade of selected Swiss WWTPs to reduce micropollutant loads. The effects of the first upgrades are already evident.  Read more

At Tiefencastel (Canton Graubünden), a bypass tunnel built in 2012 ensures that, rather than accumulating in the Solis reservoir, sediments are transported downstream during high flows. Photo: ewz-Medienarchiv, Matthias Kunfermann
May 18, 2017

Bypass tunnels designed to reduce sediment deposition in reservoirs also have beneficial effects on ecological conditions in downstream receiving waters. This was the conclusion of a study carried out on the Solis reservoir in Graubünden by biologists from Eawag and the Zurich University of Applied Sciences (ZHAW).  Read more

Carpanak close to Van was until the years of 1960 a peninsula, accessible by foot. Photo: Yama Tomonaga
May 16, 2017

The sediments of Lake Van in Eastern Anatolia (Turkey) are a valuable climate archive. Now, using the salinity measured in sediment porewater, scientists have reconstructed the huge lake-level fluctuations that occurred over the past 250,000 years. This approach – based on simple physical concepts – is likely to be more widely applied in the future. Read more

Fieldwork on Lake Victoria
May 2, 2017

A conflict is developing in Africa’s Lake Victoria between fish farming in cages and the “normal” fishing industry. Added to that are other factors such as invasive species, wastewater pollution, pesticides and dam construction are putting the unique ecosystem under increasing pressure.  Read more

Photo: Eawag / Plancton
April 11, 2017

Although chemical micropollutants are known to affect the ecology of natural waters, it has remained unclear how they do so. An Eawag study has now shown that increasing concentrations of pharmaceuticals and personal care products reduce the diversity of algae in a lake, giving rise to more homogeneous communities with a reduced capacity to adapt to fluctuations in environmental conditions. Read more

Synthetic silver  nanoparticles , magnified by a factor of 100,000 (Eawag, Ralph Kägi)
April 6, 2017

Over the past five years, 23 Swiss research groups have been investigating the behaviour of synthetic nanomaterials. Today the steering Committee and project leaders present their findings and a synthesis in a press conference at Bern. One of the main aims of National Research Programme 64 was to assess the risks they pose for human health and the environment.  Read more