Gyrodactylus salaris – kartlegging i Drammensregionen
Overvåkingsprogrammet utreder om Gyrodactylus salaris finnes på fiskebestander i innsjøer og elver som drenerer til Drammenselva.
In 2019, the Norwegian Food Safety Authority decided to close the fish ladder in Hellefossen. This was done to exclude the stretch upstream of Hellefossen in a future treatment of the river to get rid of Gyrodactylus salaris. Provided that Hellefossen functions as an absolute barrier to fish migration, the area upstream will over time become free of Atlantic salmon and G. salaris.
To document if the closure of the fish ladder in Hellefossen has had the desired effect on reducing the Atlantic salmon and G. salaris population, the Norwegian Food Safety Authority, NFSA, commissioned the Norwegian Veterinary Institute, NVI, to carry out surveillance in River Drammenselva, starting from 2020. In 2022, NFSA further commissioned NVI to carry out surveillance for G. salaris in lakes draining into the River Drammenselva catchment upstream of the anadromous part of the river.
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- Atlantic salmon and Gsalaris in the River Drammen 2021 (pdf 2mb)
- Atlantic salmon and Gsalaris in the River Drammen 2020 (pdf 2mb)
- Drammenselva catchment 2018 (pdf 902kb)
- Drammenselva catchment 2017 (pdf 862kb)
- Drammensregionen 2016 (pdf 829kb)
- Tyrifjorden 2015 (pdf 1mb)