Cristin-resultat-ID: 1125986
Sist endret: 10. juli 2015 16:41
NVI-rapporteringsår: 2014
Resultat
Vitenskapelig artikkel
2014

Can the river location within a fjord explain the density of Atlantic salmon and sea trout?

Bidragsytere:
  • Knut Wiik Vollset
  • Helge Skoglund
  • Bjørn Torgeir Barlaup
  • Ulrich Pulg
  • Sven Erik Gabrielsen
  • Tore Wiers
  • mfl.

Tidsskrift

Marine Biology Research
ISSN 1745-1000
e-ISSN 1745-1019
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2014
Publisert online: 2013
Trykket: 2014
Volum: 10
Hefte: 3
Sider: 268 - 278

Importkilder

Scopus-ID: 2-s2.0-84886912516

Finansiering

  • Norges forskningsråd

    • Prosjektkode: 193818

Beskrivelse Beskrivelse

Tittel

Can the river location within a fjord explain the density of Atlantic salmon and sea trout?

Sammendrag

The rivers that drain into the Hardangerfjord were historically known to have numerous populations of both sea trout (Salmo trutta) and Atlantic salmon (Salmo salar). After a decline in catches during the last decades many of the rivers have been closed for fishing. In this study we use snorkelling observations from rivers and catch statistics from 2004 to 2011 to describe the current situation and analyse the patterns of density of wild salmon, sea trout and escaped farmed salmon in the Hardangerfjord rivers. We hypothesize that some of the variance in density of salmon and sea trout can be explained by the location of the river in the fjord, with fish from rivers with a longer fjord exposure having a lower density. A median number of 3.5 salmon×ha−1 and 14.9 sea trout×ha−1 were observed in the rivers. Farmed salmon were observed in all rivers and constituted on average 23.3% of the total number of observed salmon. For salmon, there was an inverse log-linear relationship between density in the river and migration distance to coast, with a higher density in rivers with a shorter migration distance. For sea trout there was no evident relationship with location within the fjord. We suggest that the spatial patterns observed for salmon and sea trout can be related to the species-specific differences in habitat use within the fjord system.

Bidragsytere

Knut Vollset

Bidragsyterens navn vises på dette resultatet som Knut Wiik Vollset
  • Tilknyttet:
    Forfatter
    ved Uni Research Miljø ved NORCE Norwegian Research Centre AS

Helge Skoglund

  • Tilknyttet:
    Forfatter
    ved Uni Research Miljø ved NORCE Norwegian Research Centre AS

Bjørn Torgeir Barlaup

  • Tilknyttet:
    Forfatter
    ved Uni Research Miljø ved NORCE Norwegian Research Centre AS

Ulrich Pulg

  • Tilknyttet:
    Forfatter
    ved Uni Research Miljø ved NORCE Norwegian Research Centre AS

Sven Erik Gabrielsen

  • Tilknyttet:
    Forfatter
    ved Uni Research Miljø ved NORCE Norwegian Research Centre AS
1 - 5 av 8 | Neste | Siste »