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In thestudy, published in Nature Food, the research team estimates that recreational fishing in lakes and rivers accounts for more than eleven per cent of the annually reported catches in inland fisheries worldwide. The analyzed total consumption value of harvested fish is around 10 billion US dollars per year. Due to climate change and direct human impacts on freshwater ecosystems, the productivity of important fish species such as trout and salmon is declining, affecting the nutritional services offered by rivers and lakes.

This study in Nature Climate Change shows how interactions between climate change and urbanisation affect biodiversity and ecosystem dynamics. The authors point out that the interactions between these two drivers of global change can have far-reaching effects, and how this knowledge can inform urban planning.

Together with Dr Jörn Gessner from IGB and the Director of the Lower Oder Valley National Park, Dirk Treichel, Federal Environment Minister Steffi Lemke today released 600 sturgeons into the Oder River near Criewen. The new home of the young fish is a special habitat, as the Oder is the last major river in Germany where sturgeon and other animals can migrate unhindered over long distances. Since 2006, it has been a priority area for the reintroduction of the Baltic sturgeon.

Oxygen is essential for most aquatic organisms. Chemical and biological processes, such as the ability to self-purify, are also dependent on oxygen. However, environmental changes and rising water temperatures are altering the oxygen content of lakes, ponds and pools. Oxygen concentrations in the deep layers of lakes are decreasing worldwide. In addition, oxygen depletion can lead to an increased release of greenhouse gases. IGB researchers are investigating the extent and consequences of this. In the process, they are also questioning some theories about the laws of lake ecology.

In order to protect lakes from chronic diseases and threatening conditions and to heal them, strategies similar to those used in human healthcare should be applied: Prophylaxis, regular screening, treatment and mitigation on a local to global scale.

A new IGB manual makes knowledge about the construction methods and authorisation requirements for Vertical Wetlands publicly available to interested parties.

The Atlantic salmon (Salmo salar) has long been identified as a threatened species. In order to better understand its life cycle, long-term monitoring of the salmon population in Girnock, Scotland, a well-known freshwater habitat of this migratory fish species, was started around sixty years ago. The work is the most detailed long-term study of an Atlantic salmon population in the world. It revealed quantitative changes in the return rates, distribution, size, growth and age of salmon.

At around 380 kilometres, the Spree is not one of Germany’s longest rivers, but it is one of its most famous. As the capital’s river, it is representative of water bodies in Germany and around the world that are under increasing pressure. While private and commercial interests in its water resources continue to grow, it is also clear that there will be significantly less water available in the future. What needs to be done to counteract this is the subject of controversial debate.