Factors affecting year-to-year and within river variability of one-sea-winterAtlantic salmon in Norwegian rivers ...

• Main Authors: Otero, Jaime, Jensen, Arne J., L’Abée-Lund, Jan Henning, Stenseth, Nils Chr., Storvik, Geir O., Vøllestad, Leif Asbjørn
• Format: Conference Object
• Language: unknown
• Published: ASC 2009 - Theme session E 2024
• Subjects: Fisheries and aquaculture; Pressures, impacts, conservation, and management; Atlantic salmon; Salmo salar
• Online Access: https://dx.doi.org/10.17895/ices.pub.25070849.v1; https://ices-library.figshare.com/articles/conference_contribution/Factors_affecting_year-to-year_and_within_river_variability_of_one-sea-winterAtlantic_salmon_in_Norwegian_rivers/25070849/1

No abstracts are to be cited without prior reference to the author.Many Atlantic salmon, Salmo salar, populations are decreasing throughout its distributional range due to several factors acting in concert. A number of studies have documented the influence of freshwater and ocean conditions, climate variability and “man-made obstacles” including dams and aquaculture. However, most of the historical research has focused on single or few river analyses, and quantifying isolated effects rather than handling factors in conjunction. By using a multi-river mixed-effects model we estimated impacts of oceanic and riverine conditions, as well as human threats on both year-to-year and within river variability across 60 time series of recreational catch of one-sea-winter salmon (grilse) from Norwegian rivers over 29 years (1979−2007). Warm coastal temperatures at the time of smolt entrance into the sea and increased water discharge during upstream migration were associated with higher rod catches of grilse. When ...