Browsing Brage IMR by Author "Torgersen, Thomas"
Now showing items 1-14 of 14
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A system for online assessment of fish welfare in aquaculture
Stien, Lars Helge; Gytre, Trygve; Torgersen, Thomas; Sagen, Helge; Kristiansen, Tore S. (ICES CM documents;2008/R:18, Working paper, 2008)Aquaculture sea cages can now be more than 30 meters deep. It has therefore become next to impossible for fish farmers to form a complete picture of the welfare situation of the fish. It is consequently all ]important ... -
Akustiske studier av fisk og makroplankton over kontinentalsokkelen og det østlige Norskehavet, mars 1992; fordeling, atferd og metodiske problemer.
Torgersen, Thomas (Master thesis, 1995) -
Behavior of individual mesopelagic fish in acoustic scattering layers of Norwegian fjords
Kaartvedt, Stein; Torgersen, Thomas; Klevjer, Thor A.; Røstad, Anders; Devine, Jennifer A. (Journal article; Peer reviewed, 2008-05-22)Mesopelagic acoustic scattering layers (SLs) in 2 fjords were studied from a stationary research vessel. Diel vertical movements of SLs were assessed by hull-mounted transducers, while in situ behavior of individuals ... -
Changes in water temperature and oxygen: the effect of triploidy on performance and metabolism in large farmed Atlantic salmon
Sambraus, Florian; Remen, Mette; Olsen, Rolf Erik; Hansen, Tom Johnny; Waagbø, Rune; Torgersen, Thomas; Lock, Erik-Jan; Imsland, Albert; Fraser, Thomas W.K.; Fjelldal, Per Gunnar (Peer reviewed; Journal article, 2018) -
Exploration and learning of demand-feeding in Atlantic cod (Gadus morhua)
Nilsson, Jonatan; Torgersen, Thomas (Journal article; Peer reviewed, 2010-08-15)A bite–and–pull demand–feeding system was introduced to groups of cultured cod (Gadus morhua). For half of the groups trigger actuations were rewarded with food, while actuations were unrewarded in the other groups. ... -
Exploration and learning of demand-feeding in Atlantic cod (Gadus morhua)
Nilsson, Jonatan; Torgersen, Thomas (Journal article; Peer reviewed, 2010-08-15)A bite–and–pull demand–feeding system was introduced to groups of cultured cod (Gadus morhua). For half of the groups trigger actuations were rewarded with food, while actuations were unrewarded in the other groups. ... -
Får oppdrettslaks nok oksygen?
Remen, Mette; Oppedal, Frode; Stien, Lars Helge; Torgersen, Thomas; Olsen, Rolf Erik (Havforskningstema;1-2013, Working paper, 2013) -
Fossefall for lakseluskontroll
Torgersen, Thomas (Rapport fra havforskningen;, Research report, 2016) -
Opprettsfisk tilpasser seg
Torgersen, Thomas; Remen, Mette; Oppedal, Frode; Folkedal, Ole; Aasjord, Anne; Nilsson, Jonatan; Stien, Lars Helge; Kristiansen, Tore S. (Havforskningsnytt;Nr. 3 - 2011, Working paper, 2011)Hvor godt og hvor fort oppdrettsfisk kan venne seg til miljøforandringene de utsettes for avgjør i stor grad hvor god velferd de har, uavhengig av om miljøendringene skyldes driftsrutiner eller naturlig variasjon. -
Piscivorous fish patrol krill swarms
Kaartvedt, Stein; Røstad, Anders; Fiksen, Øyvind; Melle, Webjørn; Torgersen, Thomas; Breien, M. T.; Klevjer, Thor A. (Journal article; Peer reviewed, 2005-09-01)Dense swarms of the krill Meganyctiphanes norvegica in the Norwegian Sea were patrolled by large, piscivorous fish, which apparently use the krill swarms as feeding grounds in their hunt for planktivores. For the krill, ... -
Reply to Diggles et al. (2011): Ecology and welfare of aquatic animals in wild capture fisheries
Torgersen, Thomas; Bracke, Marc B.M.; Kristiansen, Tore S. (Journal article, 2011-05-15) -
Reply to Diggles et al. (2011): Ecology and welfare of aquatic animals in wild capture fisheries
Torgersen, Thomas; Bracke, Marc B.M.; Kristiansen, Tore S. (Journal article, 2011-05-15) -
Velferdsindikatorer for oppdrettslaks: Hvordan vurdere og dokumentere fiskevelferd - Del A. fiskevelferd og oppdrettslaks, kunnskap og teoretisk bakgrunn
Nilsson, Jonatan; Stien, Lars Helge; Iversen, Martin Haugmo; Kristiansen, Tore S; Torgersen, Thomas; Oppedal, Frode; Folkedal, Ole; Hvas, Malthe; Gismervik, Kristine; Ellingsen, Kristian; Nielsen, Kristoffer Vale; Mejdell, Cecilie Marie; Kolarevic, Jelena; Gomez, David Izquierdo; Sæther, Bjørn-Steinar; Espmark, Åsa Maria Olofsdotter; Midling, Kjell Øyvind; Roth, Bjørn; Turnbull, James F.; Noble, Chris (Others, 2017) -
Visual predation by the euphausiid Meganyctiphanes norvegica
Torgersen, Thomas (Journal article; Peer reviewed, 2001-01-05)Experiments showed that Meganyctiphanes norvegica are visual predators on copepods. Adult M. norvegica were offered a mixture of equal numbers of late stage Calanus spp. and Metridia longa in total darkness and at a light ...