Browsing NTNU Open by Author "Kristensen, Torstein"
Now showing items 1-10 of 10
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An acoustic sensor transmitter for in situ assessment of water quality and fish behaviour during chemical treatment of a parasite-infected river system: tag design and practical use
Alfredsen, Knut; Urke, Henning Andre; Kristensen, Torstein; Kvakland, Marte; Grønningsæter, Åge; Hagen, Anders Gjørwad; Alfredsen, Jo Arve (Journal article; Peer reviewed, 2021) -
Aerob utholdenhetstrening for bedret hjertefunksjon og helse hos oppdrettslaks. Prosjektperiode 1.6.2007 – 10.10.2008
Takle, Harald Rune; Kristensen, Torstein; Helland, Ståle Johannes; Grisdale-Helland, Barbara; Poppe, Trygve T; Tørud, Brit; Helgerud, Jan (Nofima rapportserie;, Research report, 2008)Prosjektet hadde som hovedmål å undersøke effekten av aerob utholdenhetstrening som metode for å bedre hjertefunksjon og helse hos laks. Prosjektet gav klare indikasjoner på at trening av lakseparr har positive effekter ... -
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 ... -
Bergverk og avgangsdeponering: Status, miljøutfordringer og kunnskapsbehov (TA-nummer 2715/2010)
Iversen, Eigil rune; Kristensen, Torstein; Aanes, Karl Jan; Fosså, Jan helge; van der Meeren, Terje; Jensen, Tor; Rye, Henrik; Løkeland, Mads; Thornhill, Maria; Bøe, Reidulv; Dekko, Trygve; Dalen, Marius; Sørby, Harald; Storbraaten, Glenn; Braastad, Grethe (Research report, 2010)Det er gjort en sammenstilling av vårt erfaringsgrunnlag når det gjelder deponering av gråberg og avgang og miljøvurderinger knyttet til bergindustriens bruk av kjemikalier. Det er tatt utgangspunkt i nasjonale og ... -
Effects of marine mine tailing exposure on the development, growth, and lipid accumulation in Calanus finmarchicus
Svendheim, Linn Hjelmeland; Jager, Tjalling; Olsvik, Pål Asgeir; Øverjordet, Ida Beathe; Ciesielski, Tomasz Maciej; Nordtug, Trond; Kristensen, Torstein; Hansen, Bjørn Henrik; Kvæstad, Bjarne; Altin, Dag; Farkas, Julia (Journal article; Peer reviewed, 2021)Marine tailing disposal (MTD) is sometimes practiced as an alternative to traditional mine tailing deposition on land. Environmental challenges connected to MTD include spreading of fine particulate matter in the water ... -
Effects of mine tailing exposure on early life stages of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus)
Farkas, Julia; Nordtug, Trond; Svendheim, Linn Hjelmeland; D Amico, Elettra; Davies, Emlyn John; Ciesielski, Tomasz Maciej; Jensen, Bjørn Munro; Kristensen, Torstein; Olsvik, Pål Asgeir; Hansen, Bjørn Henrik (Peer reviewed; Journal article, 2021)Mining and processing of minerals produce large quantities of tailings as waste. Some countries, including Norway, allow disposal of mine tailings in the sea. In this study we investigated the impacts of tailings from a ... -
Exposure to low environmental copper concentrations does not affect survival and development in Atlantic cod (Gadus morhua) early life stages
Farkas, Julia; Svendheim, Linn Hjelmeland; Jager, Tjalling; Ciesielski, Tomasz Maciej; Nordtug, Trond; Kvæstad, Bjarne; Hansen, Bjørn Henrik; Kristensen, Torstein; Altin, Dag; Olsvik, Pål Asgeir (Peer reviewed; Journal article, 2021)In this study we investigated potential impacts of Cu exposure at low, environmentally relevant, concentrations on early live stages of Atlantic cod (Gadus morhua). Cod embryos and larvae were exposed to 0.5 μg/L (low), ... -
The risk of individual fish being captured multiple times in a catch and release fishery
Thorstad, Eva Bonsak; Diserud, Ola Håvard; Solem, Øyvind; Havn, Torgeir Børresen; Bjørum, Lars Rasmus Oftedal; Kristensen, Torstein; Urke, Henning Andre; Johansen, Martin Rognli; Lennox, Robert J.; Fiske, Peder; Uglem, Ingebrigt (Peer reviewed; Journal article, 2019)The proportion of angled Atlantic salmon Salmo salar L. being caught and released has increased. If individuals are repeatedly captured, this may have fish welfare consequences. Of 995 Atlantic salmon tagged during catch ... -
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 ...