Biological recipient monitoring at the Ringhals nuclear power plant – fish and invasive species

Last changed: 04 March 2024

Potential ecosystem effects caused by the effluent cooling water from the Ringhals nuclear power plant are monitored in yearly surveys by Institute of Coastal Research, Department of Aquatic Recourses. The emphasis is on studies of fish populations, but we also monitor marine invasive species.

  • Fyke net surveys
  • Sampling of fish fry and eggs with a bongo net
  • Sampling with a modified Isaac Kidd net to document abundance of larger fish fry and adult fish
  • Monitoring of invasive species in the recipient area
  • Hydrographic observations

The first two reactors at Ringhals nuclear power plant was commissioned in 1974 and the second two began operating in June 1983.

The county administrative board has established a long-term program for monitoring the biological effects of the cooling water with fyke nets in two areas that are differently affected by the cooling water and also in a reference area.

Staff from Institute of Coastal Research at SLU Aqua also collects biological material from both land and sea for a radio ecology monitoring program under the responsibility of the Swedish Radiation Safety Authority (SSM).

The results from the biological recipient monitoring are reported annually. Every five years the results are reported in a more extensive and profound way.


Fagerholm B., Ljungberg P., Wernbo A. (2014). Biological recipient monitoring at Ringhals nuclear power plant. Yearly report for 2013. Swedish University of Agricultural Sciences, Uppsala. 52 s. Aqua reports 2014:2.

Bergström, L., M. Jansson, Sundqvist, F. och J. Andersson. 2009. Biological recipient monitoring at Ringhals nuclear power plant. 1979-2007. FINFO 2009:2, 37 s.
Biological recipient monitoring at Ringhals nuclear power plant 1979-2007

Testing areas around the Ringhals power plant. 


Anders Adill, Environmental Assessment Analyst
Department of Aquatic Resources, Institute of Coastal Research, SLU, +46 10 478 41 10