Browsing Brage IMR by Author "Oppedal, Frode"

Acclimation with lice-infested salmon improves cleaner fish delousing performance

Gentry, Katherine; Bui, Samantha; Oppedal, Frode; Bjelland, Reidun Marie; Nola, Velimir; Dempster, Timothy David (Peer reviewed; Journal article, 2021)

Securing the welfare and maximising the lice removal efficacy of ~60 million cleaner fish used each year on salmonid farms is essential to develop a productive and ethical industry with low salmon lice Lepeophtheirus ...

Adaptive photoperiod interpretation modulates phenological timing in Atlantic salmon

Oldham, Tina Marie Wier; Oppedal, Frode; Fjelldal, Per Gunnar; Hansen, Tom Johnny (Peer reviewed; Journal article, 2023)

Photoperiod, the portion of 24-h cycle during which an organism is exposed to illumination, is an important phenological cue in many animals. However, despite its influence on critical biological processes, there remain ...

AkvaVis - dynamisk GIS-verktøy for lokalisering av oppdrettsanlegg for nye oppdrettsarter : miljøkrav for nye oppdrettsarter og laks

Ervik, Arne; Agnalt, Ann-Lisbeth; Asplin, Lars; Aure, Jan; Bekkvik, Tor Christian; Døskeland, Inge; Hageberg, Anne Ansnes; Hansen, Tom; Karlsen, Ørjan; Oppedal, Frode; Strand, Øivind (Fisken og havet, Research report, 2008)

AkvaVis is a dynamic GIS tool for siting fish farms, and this report describes a prototype version for mussel farms. AkvaVis combines mappable characteristics such as depth, currents and distance from other objects, and ...

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)

Assessment of long-term implementation of sea lice prevention technologies: efficiency in reducing infestations and impact on fish welfare

Bui, Samantha; Stien, Lars Helge; Nilsson, Jonatan; Oppedal, Frode (Rapport fra havforskningen;45-2018, Research report, 2018)

Atlantic salmon Salmo salar instantaneously follow vertical light movements in sea cages

Wright, Daniel William; Glaropoulos, Alexis; Solstorm, David; Stien, Lars Helge; Oppedal, Frode (Journal article; Peer reviewed, 2015)

Atlantic salmon in marine farming environments are exposed to potentially detrimental conditions through space and time. For instance, the vertical distribution of parasitic salmon lice larvae shifts in response to changing ...

Avlusing med kaldt vann? – effektivitet og laksens velferd — sluttrapport FHF prosjekt 901488

Oppedal, Frode; Stien, Lars Helge; Wright, Daniel William; Moltumyr, Lene; Nilsson, Jonatan; Dempster, Timothy David; Overton, Kathy (Rapport fra havforskningen, Research report, 2019)

Termisk behandling av oppdrettslaks med varmt vann blir hyppig brukt av næringen som avlusingsmetode. Behandlingen rapporteres å fjerne mobile lus effektivt, men kan også føre til dårligere fiskevelferd og økt dødelighet. ...

Cage size affects dissolved oxygen distribution in salmon aquaculture

Oldham, Tina; Oppedal, Frode; Dempster, Timothy David (Journal article; Peer reviewed, 2018)

Atlantic salmon aquaculture is shifting toward larger cages, but the water quality implications of this shift are unknown. While larger cages could improve profitability through economies of scale, they may increase the ...

Cleaner fish growth, welfare and survival in Atlantic salmon sea cages during an autumn-winter production

Geitung, Lena; Wright, Daniel William; Oppedal, Frode; Stien, Lars Helge; Vågseth, Tone; Madaro, Angelico (Peer reviewed; Journal article, 2020)

Cleaner fish used as a biological control agent against salmon lice is rapidly increasing in Atlantic salmon aquaculture. However, concerns have been raised about the welfare and mortality of cleaner fish in salmon cage ...

Critical swimming speed in groups of Atlantic salmon Salmo salar

Remen, Mette; Solstorm, Frida; Bui, Samantha; Pascal, Klebert; Vågseth, Tone; Solstorm, David; Hvas, Malthe; Oppedal, Frode (Peer reviewed; Journal article, 2016)

Declining size-at-harvest in Norwegian salmon aquaculture: Lice, disease, and the role of stunboats

Barrett, LukeT.; Oldham, Tina Marie Wier; Kristiansen, Trond; Oppedal, Frode; Stien, Lars Helge (Peer reviewed; Journal article, 2022)

Sea cages used for fish farming are typically open to the environment, making the grow-out phase a race against the accumulation of infections. In Norway, farmed Atlantic salmon (Salmo salar) suffer outbreaks of salmon ...

Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments

Thompson, Cameron; Madaro, Angelico; Oppedal, Frode; Stien, Lars Helge; Bui, Samantha (Rapport fra havforskningen;2023 - 11, Research report, 2023)

A pilot study was conducted to investigate the delousing efficacy and physiological effects of freshwater and hyposaline water in Atlantic salmon ( Salmo salar ) for various treatment durations. There were four primary ...

Depth distribution of the amoebic gill disease agent, Neoparamoeba perurans, in salmon sea-cages

Wright, Daniel W.; Nowak, Barbara; Oppedal, Frode; Bridle, Andrew; Dempster, Timothy David (Journal article; Peer reviewed, 2015-07-16)

Identifying where and when parasites occur in farming environments is vital to understand transmission dynamics and develop preventative measures that reduce host-parasite encounters. A major parasite concern for Atlantic ...

Development of the salmon louse Lepeophtheirus salmonis parasitic stages in temperatures ranging from 3 to 24°C

Hamre, Lars Are; Bui, Samantha; Oppedal, Frode; Skern-Mauritzen, Rasmus; Dalvin, Sussie (Peer reviewed; Journal article, 2019)

Differential effects of internal tagging depending on depth treatment in Atlantic salmon: a cautionary tale for aquatic animal tag use.

Wright, Daniel William; Stien, Lars Helge; Dempster, Timothy David; Oppedal, Frode (Journal article; Peer reviewed, 2019)

Electronic tags are widespread tools for studying aquatic animal behavior; however, tags risk behavioral manipulation and negative welfare outcomes. During an experiment to test behavioral differences of Atlantic salmon ...

Effect of ectoparasite infestation density and life-history stages on the swimming performance of Atlantic salmon Salmo salar

Bui, Samantha; Dempster, Timothy David; Remen, Mette; Oppedal, Frode (Journal article; Peer reviewed, 2016-06-14)

To overcome sustainability obstacles and improve operations, the Atlantic salmon farming industry is testing novel approaches to production. Redistributing farm sites to offshore locations is one such solution; however, ...

The effect of fasting period on swimming performance, blood parameters and stress recovery in Atlantic salmon post smolts

Hvas, Malthe; Stien, Lars Helge; Oppedal, Frode (Peer reviewed; Journal article, 2021)

In this study, Atlantic salmon post smolts (~250 g, ~29 cm) were fasted for four weeks at 12 °C in full strength seawater. During this period, the critical swimming speed (Ucrit) was measured after 1, 2 and 4 weeks of ...