Nykvarn is the lowest lock and power plant in Stångån in the middle of Linköping - a project that is quite a few years long

- Aspen is a target species.

We knew that there were aspen left in Roxen and Motalaström, but we did not know how many wanted to go up in Stångån after there had been a stop for 150 years, says Gunnar Ölfvingsson, Linköping's municipal ecologist.

Gunnar Ölfvingsson, Linköping's municipal ecologist.

Photo: Lena Liljeborg / SVT

Due to the power plant, the municipality is building this new water fishing route, the stream channel.

It has been a long-standing project and combined with a functioning urban environment and a park that really attracts people, it is Linköping's largest nature conservation investment to date.

 - We create good ecological status in our watercourses and remove obstacles to fish and other aquatic migratory organisms and thereby comply with the EU's water directive.

See when the nature conservation initiative was inaugurated with, among others, students from Tallbodaskolan in the clip above.