The young salmon will have a better start in life after the measures. Photo: Mathias Arnham.
The young salmon will have a better start in life after the measures. Photo: Mathias Arnham.

Brighter future for salmon in River Örekilsälven

Migration barriers will be removed and wetlands restored. This is very good news for salmon and other migratory species such as trout, eel and sea lamprey.

River Örekilsälven which flows into the Saltkällefjorden bay, accounts for around eight percent of the total salmon smolt production in the waters of Sweden’s west coast, making it the most important salmon river in the area. Species such as trout, eel and sea lamprey are also found here, as well as birds and mammals such as the common tern, common grayling, otter and several species of bats. In the past, the river has been heavily impacted by dams, power plant construction and gutting.

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The first phase of the project is complete - the 60 meter long culvert is now a thing of the past.
The first phase of the project is complete - the 60 meter long culvert is now a thing of the past.

Removed concrete culvert benefits trout and river lamprey in Pjältån

In September 2024, the first Improve Aquatic LIFE action took place. In the Pjältån nature reserve, in the northeastern part of Östergötland County, a 60-meter-long and 200-ton concrete culvert was removed.

At the same time, the water was diverted back into a 250-meter natural channel that had run parallel to the culvert.
The inauguration of the project attracted around 70 visitors from the local area. Many of them took the opportunity to take a lunchtime walk to see the major change in situ. The culvert was built in the early 1970s in connection with the construction of the adjacent highway. The new solution is more nature-based and creates both more and better habitat for trout and river lamprey – two characteristic species in the area.

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The freshwater pearl mussel can purify up to 40 liters of water every day.
The river pearl mussel can purify up to 40 liters of water every day. Photo: Niklas Wengström.

Lärjeån’s freshwater pearl mussels get a boost

In Lärjeån, wildlife passages and restorations will improve the status of the threatened freshwater pearl mussel, migrating salmon and other species.

Lärjeån is a tributary of the Göta River, in Västra Götaland County. Twelve kilometers of Lärjeån’s total 55-kilometer stretch have Natura 2000 status. Priority species such as salmon and river pearl mussels are found here. Previous habitat restoration and removal of migration barriers have been carried out by county councils and local associations, but there are still problems with the river’s ecological status.

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PIT-tag marking of salmon smolts will be done in the project.
PIT-tag marking of salmon smolts will be done in the project.

Tracking fish movement patterns in Improve Aquatic LIFE

Within the Improve Aquatic LIFE project, a comprehensive study of fish migration using Passive Integrated Transponders (PIT) tags is being carried out. The aim of the study is to better understand how migratory fish species are affected by river restoration measures. By tracking fish movements, we can evaluate the impact of measures such as removing migration barriers, restoring natural stream habitats and improving water quality.

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The target species in the project include river pearl mussels and salmon. Photo Nicka Hellenberg.
The target species in the project include river pearl mussels and salmon. Photo Nicka Hellenberg.

Europe’s largest water conservation project

Improve Aquatic LIFE is the name of one of Europe’s largest water conservation projects to restore aquatic environments and carry out measures in lakes, rivers and coastal waters in nine different counties, mainly in southern Sweden.

Improve Aquatic LIFE is funded by the EU, the Swedish Agency for Marine and Water Management and the Swedish Environmental Protection Agency, among others.

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Skälderviken in Skåne with stones in the foreground illustrating that stones from the coast have been removed by 'stone fishing' and the stone reefs need to be restored to bring back the habitats that have disappeared.
Stone reefs to be rebuilt on the coast

Themes for improvement

In Improve Aquatic LIFE we work in different themes. These are improving connectivity in watercourses, improving habitats in watercourses and coastal areas, improving the hydrological regime by restoring the water-holding capacity of the landscape and improving conditions for our target species salmon, sea lamprey, thick-shelled mussel and river pearl mussel. For each theme, we have a theme coordinator who, among other things, will ensure that we take advantage of the results and experiences we gain within the project by documenting the learning.

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400 million for nature conservation

The County Administrative Board of Skåne is receiving EU support to launch Europe’s largest water restoration project. Almost SEK 400 million will be invested in improving aquatic environments, reducing the effects of climate change and strengthening threatened fish and mussel populations in southern Sweden, where watercourses, wetlands and coastal waters will be restored.

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