The plant, which resembles a small yellow water lily, has spread to about 30 areas in the lake where it is shallow.

- As far as we know, Lake Rinnen is the only lake in Värmland that has been affected.

Sea gold is found in other places in the country, but we want to try to prevent it from spreading to other watercourses, says Amanda Jarefjäll, nature and water strategist at Kil municipality.

Sea gold spreads extremely easily, so it is important to try to limit the distribution.

And this is done by laying out frames with non-woven fabric, which holds down the plant so that it does not get light and can live on.

Volunteers line up

Rennstad's village team is part of the voluntary forces that set up non-profit work to build and lay out frameworks.

Work is currently underway at Långviken in the western part of the lake.

- We have fun when we work.

Most of us are retired so we have time, but it would certainly be good if more people could stand up and help, says Lars Engström, one of the members of Rennstad's village team.

The project "sea gold in Rinnen" is a nature conservation project run by Kils and Arvika municipalities with support from Grums and Karlstad municipalities, LONA, a state grant for local nature conservation projects via the county administrative board, and several local associations.