Browsing Brage IMR by Author "Folkedal, Ole"

Assessing swimming capacity and schooling behaviour in farmed Atlantic salmon Salmo salar with experimental push-cages

Hvas, Malthe; Folkedal, Ole; Solstorm, David; Vågseth, Tone; Fosse, Jan Olav; Gansel, Lars Christian; Oppedal, Frode (Peer reviewed; Journal article, 2017)

Automatic length estimation of free-swimming fish using an underwater 3D range-gated camera

Risholm, Petter; Mohammed, Ahmed Kedir; Kirkhus, Trine; Clausen, Sigmund; Vasilyev, Leonid; Folkedal, Ole; Johnsen, Øistein; Haugholt, Karl Henrik; Thielemann, Jens T (Peer reviewed; Journal article, 2022)

Camera estimation of fish size in aquaculture production and fisheries is crucial for enabling knowledge-based decision making. Automatic estimation of fish lengths on an individual and population basis are key steps to ...

Brain serotonergic activation in growth-stunted farmed salmon: Adaption versus pathology

Vindas, Marco Antonio; Johansen, Ida Beitnes; Folkedal, Ole; Höglund, Erik; Gorissen, Marnix; Flik, Gert; Kristiansen, Tore S; Øverli, Øyvind (Journal article; Peer reviewed, 2016-05-25)

Signalling systems activated under stress are highly conserved, suggesting adaptive effects of their function. Pathologies arising from continued activation of such systems may represent a mismatch between evolutionary ...

Consistent melanophore spot patterns allow long-term individual recognition of Atlantic salmon Salmo salar

Stien, Lars Helge; Nilsson, Jonatan; Bui, Samantha; Fosseidengen, Jan Erik; Kristiansen, Tore S; Øverli, Øyvind; Folkedal, Ole (Peer reviewed; Journal article, 2017)

Coping with Unpredictability: Dopaminergic and Neurotrophic Responses to Omission of Expected Reward in Atlantic Salmon (Salmo salar L.)

Vindas, Marco A.; Sørensen, Christina; Johansen, Ida B.; Folkedal, Ole; Höglund, Erik; Khan, Uniza W.; Stien, Lars Helge; Kristiansen, Tore S.; Braastad, Bjarne O.; Øverli, Øyvind (Journal article; Peer reviewed, 2014-01-17)

Comparative studies are imperative for understanding the evolution of adaptive neurobiological processes such as neural plasticity, cognition, and emotion. Previously we have reported that prolonged omission of expected ...

Effect of temperature on the metabolism, behaviourand oxygen requirements of Sparus aurata

Remen, Mette; Olsen, Rolf Erik; Oppedal, Frode; Thorsheim, Grethe Beate; Folkedal, Ole; Sitjà-Bobadilla, Ariadna; Pérez-Sánchez, Jaume; Nederlof, Marit A. J. (Journal article; Peer reviewed, 2015-09-03)

We investigated the effect of temperature on the limiting oxygen saturation (LOS) of gilthead sea bream Sparus aurata. This threshold was defined as the % O2 saturation where fish no longer upheld their routine metabolic ...

Effect of water temperature and exposure duration on detachment rate of salmon lice (Lepeophtheirus salmonis); testing the relevant thermal spectrum used for delousing

Nilsson, Jonatan; Barrett, Luke T.; Mangor-Jensen, Anders; Nola, Velimir; Harboe, Torstein; Folkedal, Ole (Peer reviewed; Journal article, 2023)

Thermal delousing has become the most applied method for treatment against salmon lice. However, the temperature range used is strongly aversive for salmonids, and the method is associated with increased mortality. Treatment ...

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Hansen, Tom Johnny; Fjelldal, Per Gunnar; Folkedal, Ole; Vågseth, Tone; Oppedal, Frode (Peer reviewed; Journal article, 2017)

Exposed Aquaculture Operations: Strategies for Safety and Fish Welfare

Bjelland, Hans Vanhauwaert; Folkedal, Ole; Føre, Heidi Moe; Grøtli, Esten Ingar; Holmen, Ingunn Marie; Lona, Eivind; Størkersen, Kristine Vedal; Thorvaldsen, Trine (Peer reviewed; Journal article, 2024)

The expansion of aquaculture production into more exposed harsh and remote ocean environments presents both new opportunities and challenges. To manage the complexities of exposed operations, research into fish welfare, ...

Fish welfare in offshore salmon aquaculture

Hvas, Malthe; Folkedal, Ole; Oppedal, Frode (Peer reviewed; Journal article, 2020)

To accommodate further growth in the Atlantic salmon aquaculture industry, new production sites may well be established at more exposed locations along the coast or even offshore. Here, fish will encounter strong currents ...

Full compensatory growth before harvest and no impact on fish welfare in Atlantic salmon after an 8-week fasting period

Hvas, Malthe; Nilsson, Jonatan; Vågseth, Tone; Nola, Velimir; Fjelldal, Per Gunnar; Hansen, Tom Johnny; Oppedal, Frode; Stien, Lars Helge; Folkedal, Ole (Peer reviewed; Journal article, 2021)

Individually tagged Atlantic salmon postsmolts (≈1200 g, 46 cm) reared in triplicate indoor holding tanks were fasted for 8 weeks at 12 °C and subsequently refed for 5 weeks, whereafter they were transferred to triplicate ...

Full production cycle, commercial scale culture of salmon in submerged sea-cages with air domes reduces lice infestation, but creates production and welfare challenges

Warren-Myers, Fletcher; Vågseth, Tone; Folkedal, Ole; Stien, Lars Helge; Fosse, Jan Olav; Dempster, Tim; Oppedal, Frode (Peer reviewed; Journal article, 2021)

Structural modification of sea cages is continually changing to counter major production issues associated with commercial salmon farming. For example, snorkels and skirts are added to cages to reduce salmon lice infestations, ...

Growth and welfare of submerged Atlantic salmon under continuous lightning

Sievers, Michael; Korsøen, Øyvind Johan; Dempster, Timothy David; Fjelldal, Per Gunnar; Kristiansen, Tore S; Folkedal, Ole; Oppedal, Frode (Peer reviewed; Journal article, 2018)

ABSTRACT: Although surface-based cages dominate the marine finfish aquaculture industry, production issues that arise at the surface such as poor environmental conditions and the presence of parasites has spurred interest ...

Habituation and conditioning in gilthead sea bream (Sparus aurata): Effects of aversive stimuli, reward and social hierarchies

Folkedal, Ole; Fernö, Anders; Nederlof, Marit A. J.; Fosseidengen, Jan Erik; Cerqueira, Marco; Olsen, Rolf Erik; Jonatan, Nilsson (Peer reviewed; Journal article, 2017)