Final report: Mitigating eutrophication by means of biomanipulation

Author: Sture Hansson, Institutionen för ekologi, miljö och botanik, Stockholms universitet
Year published: 2013

Final Project report.  The project has stocked around 870 000 juvenile pikepearch over a period of 4 years into the Himmerfjärden bay to study if an increased population of pelagic predatory fish could be used to mitigate phytoploankton blooms and filamentous algae by reducing the number of zooplanktivorous fish. In summary the restocking was unsuccessful and therefore restocking of pikepearch is not recommended as a mitigation measure against Eutrophication symptoms based on the present knowledge.

Pages: 15

Read the final project report here. (The report is in swedish).

Our focus areas

fisheryThe stock of predatory fish is crucial for the state of the Baltic Sea. Therefore, the Foundation worked to ensure that the environmental effects of fishing should be a central part of the EU's Common Fisheries Policy. The Foundation also worked on projects to increase the proportion of predatory fish, such as cod, pike and perch. Read more

eutroEutrophication is caused by emissions of nutrients that come from e.g. agriculture, water treatment plants, sewage and transportation. To find measures that could reduce emissions the Foundation worked on projects in agriculture, industrial animal farms and the coastal zone, to research on measures to catch or bind nutrients. Read more

seagull-informationTo create awareness about the threats and opportunities the Baltic Sea is facing, the Foundation initiated a 10-year media and film project with journalist Folke Rydén and photographer Mattias Klum. The Foundation has also supported Stockholm University Baltic Sea Centre (Baltic Eye), and Baltic Sea Science Center at Skansen. Read more