Browsing NTNU Open by Author "Ulvund, John Birger"
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Behavioural response of farmed Atlantic salmon (Salmo salar L.) to artificial underwater lights: Wavelet analysis of acoustic telemetry data
Ulvund, John Birger; Engebretsen, S.; Alfredsen, Jo Arve; Kristensen, Torstein; Urke, H.A.; Jansen, P.A. (Peer reviewed; Journal article, 2021)Biological, environmental, economic and ethical issues become increasingly pertinent as the scale of the aquaculture industry expands. This study used acoustic telemetry data and wavelet analysis to investigate behavioural ... -
Internet of Fish: Integration of acoustic telemetry with LPWAN for efficient real-time monitoring of fish in marine farms
Hassan, Waseem; Føre, Martin; Ulvund, John Birger; Alfredsen, Jo Arve (Journal article; Peer reviewed, 2019)The aim of this study was to develop and test the feasibility of a concept called Internet of Fish (IoF). State-of-the-art acoustic telemetry systems could enable farmers to acquire behavioural data of fish in fish farms, ... -
New concept for measuring swimming speed of free-ranging fish using acoustic telemetry and Doppler analysis
Hassan, Waseem; Føre, Martin; Urke, Henning Andre; Ulvund, John Birger; Bendiksen, Eskil; Alfredsen, Jo Arve (Peer reviewed; Journal article, 2022)A novel technique for measuring individual fish swimming speed based on conventional acoustic telemetry and Doppler analysis was tested with live tagged fish in a field experiment at a fish farm. The aim of the experiment ... -
Size dependency of spatial and temporal patterns of marine migration of sea trout (Salmo trutta L.) and Arctic char (Salvelinus alpinus (L.)) in Repparfjord Northern Norway
Ulvund, John Birger (Master thesis, 2011)Acoustic telemetry was used to study the movements and habitat use of sea trout (Salmo trutta L.) and Arctic char (Salvelinus alpinus (L.)) in Repparfjord in Northern Norway during July until October 2010. In total, 18 ... -
Synchrony and multimodality in the timing of Atlantic salmon smolt migration in two Norwegian fjords
Bjerck, Helge Bostwick; Urke, Henning Andre; Haugen, Thrond Oddvar; Alfredsen, Jo Arve; Ulvund, John Birger; Kristensen, Torstein (Peer reviewed; Journal article, 2021)The timing of the smolt migration of Atlantic salmon (Salmo salar) is a phenological trait increasingly important to the fitness of this species. Understanding when and how smolts migrate to the sea is crucial to understanding ... -
System for Real-Time Positioning and Monitoring of Fish in Commercial Marine Farms Based on Acoustic Telemetry and Internet of Fish (IoF)
Hassan, Waseem; Føre, Martin; Urke, Henning Andre; Kristensen, Torstein; Ulvund, John Birger; Alfredsen, Jo Arve (Chapter, 2019)In this study the performance of the Internet of Fish (IoF) concept, a real-time acoustic positioning and fish monitoring system, was assessed in a commercial marine fish farm in Norway. Central to the IoF concept is the ...