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Behaviour of spawning Atlantic salmon and brown trout during ramping events

Behaviour of spawning Atlantic salmon and brown trout during ramping events

Category
Journal publication
Abstract
Under-water video was used to observe the behaviour of adult Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) on a spawning ground during ramping events in a hydro-peaked river. The water depth in the reach was continuously recorded at a stream gauge and water depths in front of the cameras were reconstructed by means of a hydrodynamic model. Fish species, size, spawning-related activity, chasing behaviour and a swimming-speed-related activity level were recorded for each camera in 10-min intervals. Decreases in flow occurring during down-ramping led to higher activity levels and spawning interruptions. Trout were observed in the reach down to 0.13 m and salmon down to 0.17 m. The salmon was observed preparing nests at a water level of 0.30 m. Salmon used on average 122 min after the beginning of an up-ramping event to return to the spawning site and start digging again.
Client
  • Norges forskningsråd / 193818
Language
English
Author(s)
  • Haas Christian
  • Zinke Peggy
  • Vollset Knut Wiik
  • Sauterleute Julian Friedrich
  • Skoglund Helge
Affiliation
  • Germany
  • SINTEF Energy Research / Energisystemer
  • NORCE Norwegian Research Centre AS
Year
2016
Published in
Journal of Applied Water Engineering and Research
ISSN
2324-9676
Volume
4
Issue
1
Page(s)
25 - 30