River Klarälven in Sweden is a regulated watercourse
with many dams that impede the migration of fish, both
upstream and downstream. Yet salmon and
trout populations have sustained in River Klarälven, and they are an important source of income
for fishing and tourism.
and Karlstad University have worked together in River Klarälven in a project
called "Salmon and trout in Klarälven", after which the parties decided
to continue the research collaboration. In the new cooperation, the emphasis is
on improving the downstream migration of the fish, which previously has been left
aside, not only in Klarälven but in many rivers around the world.
Research project gives more information on the migration of salmonids
is directed mainly on improving the survival of young salmon (smolts) and kelt (salmon that has
spawned and returns to the lake or sea) on the way from the spawning and breeding
areas down to Lake Vänern. The project consists of four studies: 1) Designing
of the action(s) to improve the downstream migration, 2) Measurement of
hydraulic conditions upstream from Edsforsen's power plant to illustrate the
current conditions of fish movements and potential measures, 3) Identification
of the behavior of the downstream migrating kelt fish and of the choices as
they approach Edsforsen and 4) Study on the behavior of the smolts in front of
different types of hydraulic conditions (e.g. various forms of acceleration and
turbulence in a controlled environment).
9 million SEK (about 1 million euros) is spent on salmon studies in River
Klarälven during 2012-2015. The project is funded primarily through funds from
Fortum's R&D and from the sales of Bra Miljöval-labeled electricity, and
Karlstad University participates with some financing.