Browsing Brage IMR by Author "Oppedal, Frode"
Now showing items 41-60 of 104
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For høy vannstrøm kan påvirke vekst og velferd på eksponerte lokaliteter
Solstorm, Frida; Oppedal, Frode (Journal article, 2015) -
Free-living Neoparamoeba perurans depth distribution is mostly uniform in salmon cages, but reshaped by stratification and potentially extreme fish crowding
Wright, Daniel William; Nowak, Barbara; Oppedal, Frode; Bridle, Andrew; Dempster, Timothy David (Peer reviewed; Journal article, 2017)Understanding the spatio-temporal positioning of hosts and their parasites in free-living states is useful in devising methods to diminish parasite encounters in animal production systems. We explored the potential for ... -
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, ... -
Group Behavioural Responses of Atlantic Salmon (Salmo salar L.) to Light, Infrasound and Sound Stimuli
Bui, Samantha; Oppedal, Frode; Korsøen, Øyvind Johan; Sonny, Damien; Dempster, Tim (Journal article; Peer reviewed, 2013-05-17)Understanding species-specific flight behaviours is essential in developing methods of guiding fish spatially, and requires knowledge on how groups of fish respond to aversive stimuli. By harnessing their natural behaviours, ... -
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 ... -
Havbasert oppdrett – hvor mye vannstrøm tåler laks og rensefisk? - fiskevelferd og grenseverdier
Hvas, Malthe; Folkedal, Ole; Oppedal, Frode (Rapport fra havforskningen;2019 - 37, Research report, 2019)I fremtiden ønskes oppdrettsanlegg på mer eksponerte lokaliteter, gjerne langt til havs. Da kan fisken oppleve langt sterkere vannstrøm enn på tradisjonelle lokaliteter. Tåler laksen dette? Det er mange fordeler med ... -
Havbruksrapport 2004
Agnalt, Ann-Lisbeth; Ervik, Arne; Kristiansen, Tore S.; Oppedal, Frode (Fisken og havet, særnummer;3-2004, Research report, 2004-02) -
Heart rate bio-loggers as welfare indicators in Atlantic salmon (Salmo salar) aquaculture
Hvas, Malthe; Folkedal, Ole; Oppedal, Frode (Peer reviewed; Journal article, 2020)In this study, 12 farmed Atlantic salmon (~1200 g) were tagged with commercially available heart rate (HR) bio-loggers and maintained in a controlled fish tank laboratory environment at 9 °C on a 12 h day/night cycle for ... -
High host densities dilute sea lice Lepeophtheirus salmonis loads on individual Atlantic salmon, but do not reduce lice infection success
Samsing, Francisca; Oppedal, Frode; Johansson, David; Bui, Samantha; Dempster, Tim (Journal article; Peer reviewed, 2014-12-02)Host density likely plays a key role in host−parasite interactions, but empirical evidence in marine ecosystems remains limited. Classical models predict a positive relationship between host density and parasite infection ... -
High host densities dilute sea lice Lepeophtheirus salmonis loads on individual Atlantic salmon, but do not reduce lice infection success
Samsing, Francisca; Oppedal, Frode; Johansson, David; Bui, Samantha; Dempster, Timothy David (Peer reviewed; Journal article, 2014) -
Hvordan står det til i merden?
Gytre, Trygve; Stien, Lars Helge; Oppedal, Frode (Havforskningsnytt, Working paper, 2007) -
Impact of thermoclines on the vertical distribution of salmon lice larvae
Crosbie, Thomas; Wright, Daniel William; Oppedal, Frode; Dalvin, Sussie; Myksvoll, Mari Skuggedal; Dempster, Timothy (Peer reviewed; Journal article, 2020)Salmon louse Lepeophtheirus salmonis, a key parasite of salmonids, is managed by multiple methods at both salmon farm- and ecosystem-scale that are informed by an understanding of the abundance and distribution of the ... -
In situ sea lice egg sterilization with UVC light
Bui, Samantha; Oppedal, Frode; Barrett, Luke; Dempster, Tim; Pert, Cassie (Rapport fra havforskningen;2019 - 29, Research report, 2019)Sea-cage salmon farming creates ideal conditions for population growth of the salmon louse Lepeophtheirus salmonis, potentially leading to poor welfare and mortality in farmed salmon and nearby wild salmonids. Frequent ... -
Influence of experimental set-up and methodology for measurements of metabolic rates and critical swimming speed in Atlantic salmon Salmo salar
Hvas, Malthe; Oppedal, Frode (Journal article; Peer reviewed, 2019)In this study, swim‐tunnel respirometry was performed on Atlantic salmon Salmo salar post‐smolts in a 90 l respirometer on individuals and compared with groups or individuals of similar sizes tested in a 1905 l respirometer, ... -
Laksen prøver å unngå avlusingsmiddel : Salmon attempt to avoid delousing agent
Oppedal, Frode (Havforskningsnytt, Working paper, 2009)Bath treatments are often used to control sea lice on large farmed salmon. This involves putting a tarpaulin skirt or bag around the cage, and mixing the therapeutant into the water in which the fish are confined. New ... -
Lusepåslag og velferd hos dypfôret og overflatefôret laks på lokalitet Skrubbholmen midtvinters. – Delrapport fra FHF-prosjekt 901154 «Dypelysogfôring»
Nilsson, Jonatan; Stien, Lars Helge; Oppedal, Frode (Rapport fra havforskningen;35-2018, Research report, 2018) -
Lys og temperatur påvirker fiskens adferd - har det konsekvenser for fisketetthet og lyssetting?
Oppedal, Frode; Juell, Jon-Erik (Havforskningsnytt, Working paper, 2006) -
Merd-miljø og fiskevelferd i lakseproduksjon på kyst- og fjordlokaliteter på Vestlandet
Johansson, David; Juell, Jon-Erik; Oppedal, Frode; Stiansen, Jan Erik; Fosseidengen, Jan Erik (Fisken og havet, Research report, 2004)This survey give detailed information about the complex variation of the physical, biological and chemical variation in environment at typical fjord and coastal farming sites in the autumn. Large variations with depth and ... -
Merdmiljø
Oppedal, Frode (Havforskningsnytt;Nr. 5 - 2011, Working paper, 2011)Miljøet i en oppdrettsmerd er avgjørende for både produksjonsresultatet, fiskens velferd og helse. Etter at anlegget er geografisk plassert (lokalisert) er merdmiljøet blant annet gitt av faktorer som variasjoner i ...