Blar i Brage IMR på forfatter "Stien, Lars Helge"
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Risikovurdering norsk fiskeoppdrett 2016
Havforskningsinstituttet (Fisken og Havet, særnummer;2-2016, Research report, 2016-04) -
Salmon lice treatments and salmon mortality in Norwegian aquaculture: a review
Overton, Kathy; Dempster, Tim; Oppedal, Frode; Kristiansen, Tore S; Gismervik, Kristine; Stien, Lars Helge (Journal article; Peer reviewed, 2018)With the expansion of Atlantic salmon aquaculture, the economic and ecological impacts of salmon lice (Lepeophtheirus salmonis) has increased. Norway battles this problematic parasite with various control and preventative ... -
Skeletal deformities in wild and farmed cleaner fish species used in Atlantic salmon Salmo salar aquaculture
Fjelldal, Per Gunnar; Madaro, Angelico; Hvas, Malthe; Stien, Lars Helge; Oppedal, Frode; Fraser, Thomas (Peer reviewed; Journal article, 2020)As a first attempt to assess bone health in cleaner fish production, wild and cultured ballan wrasse Labrus bergylta and lumpfish Cyclopterus lumpus were examined by radiology. In C. lumpus, wild fish (57%) had more vertebra ... -
Snorkel sea-cage technology decreases salmon louse infestation by 75% in a full-cycle commercial test
Geitung, Lena; Oppedal, Frode; Stien, Lars Helge; Dempster, Timothy David; Karlsbakk, Egil; Nola, Velimir; Wright, Daniel William (Journal article; Peer reviewed, 2019)Methods to prevent parasite infestations in farmed fish are becoming widespread, yet tests of their effectiveness often lack commercial relevance and statistical power, which may lead to technology misuse. Here, we examined ... -
'Snorkel' sea lice barrier technology reduces sea lice loads on harvest-sized Atlantic salmon with minimal welfare impacts
Stien, Lars Helge; Dempster, Timothy David; Bui, Samantha; Glaropoulos, Alexis; Fosseidengen, Jan Erik; Wright, Daniel W.; Oppedal, Frode (Journal article; Peer reviewed, 2016-02-13)The infestation of farmed Atlantic salmon (Salmo salar) by ectoparasitic sea lice (Lepeophtheirus salmonis) presents a need for new approaches to parasite control. One option is the use of ‘snorkel’ sea lice barrier ... -
Snorkelmerd: Produksjonseffektivitet, adferd og velferd. Sluttrapport FHF-prosjekt 900884
Oppedal, Frode; Dempster, Tim; Stien, Lars Helge (Rapport fra Havforskningen;9-2016, Research report, 2016-02)English: The snorkel cage creates a mismatch between the salmon lice infestative larvae stage and the salmon, thus minimizing infestations. The snorkel cages comprise a roof of net to keep the fish down, but with a tarpaulin ... -
Soft Texture of Atlantic Salmon Fillets Is Associated with Glycogen Accumulation
Torgersen, Jacob S.; Koppang, Erling Olaf; Stien, Lars Helge; Kohler, Achim; Pedersen, Mona E.; Mørkøre, Turid (Journal article; Peer reviewed, 2014-01-09)Atlantic salmon (Salmo salar L.) with soft fillets are not suited for manufacturing high quality products. Therefore fillets with insufficient firmness are downgraded, leading to severe economic losses to the farming and ... -
Sudden exposure to warm water causes Instant behavioural responses indicative of nociception or pain in Atlantic salmon
Nilsson, Jonatan; Moltumyr, Lene; Madaro, Angelico; Kristiansen, Tore S; Gåsnes, Siri Kristine; Mejdell, Cecilie Marie; Gismervik, Kristine; Stien, Lars Helge (Journal article; Peer reviewed, 2019)Thermal treatment has become the most used delousing method in salmonid aquaculture. However, concerns have been raised about it being painful for the fish. We studied the behavioural response of Atlantic salmon acclimated ... -
Summary and status of deep lights and deep feed use in commercial settings: welfare, behaviour and infestation at three case study sites — End report from the FHF projects 901154 “Dypelysogfôring”
Bui, Samantha; Oppedal, Frode; Nilsson, Jonatan; Oldham, Tina Marie Wier; Stien, Lars Helge (Rapport fra havforskningen, Research report, 2019)Infective salmon lice are attracted to light and are therefore more abundant near the surface than deep in the cage. Manipulating salmon swimming depth by the use of deep lights and deep feeding could therefore spatially ... -
Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare
Wright, Daniel William; Geitung, Lena; Karlsbakk, Egil; Stien, Lars Helge; Dempster, Timothy David; Oldham, Tina; Nola, Velimir; Oppedal, Frode (Journal article; Peer reviewed, 2018)Surface environment modification is a potential parasite control strategy in Atlantic salmon sea-cage farming. For instance, a temporary low salinity surface layer in commercial-scale snorkel sea-cages has coincided with ... -
Tapeworm (Eubothrium sp.) infestation in sea caged Atlantic salmon decreased by lice barrier snorkels during a commercial-scale study
Geitung, Lena; Wright, Daniel William; Stien, Lars Helge; Oppedal, Frode; Karlsbakk, Egil Erlingsson (Peer reviewed; Journal article, 2021)Reports of infestation by marine parasitic tapeworms (Eubothrium sp.) and an associated growth reduction in Norwegian farmed salmon are on the rise. With few acceptable treatment options available, due to drug resistance ... -
Thaw rigor in Atlantic salmon (Salmo salar) fillets, as affected by thawing rate and frozen storage time
Rotabakk, Bjørn Tore; Stien, Lars Helge; Skåra, Torstein (Peer reviewed; Journal article, 2022)The influence of stress, storage time and thawing regimes was investigated with respect to rigor development and other related physical traits, on farmed Atlantic salmon. The fish were sampled from a commercial slaughterhouse ... -
The interaction between water currents and salmon swimming behaviour in sea cages
Johansson, David; Laursen, Frida; Fernö, Anders; Fosseidengen, Jan Erik; Klebert, Pascal; Stien, Lars Helge; Vagseth, Tone; Oppedal, Frode (Journal article; Peer reviewed, 2014-05-15)Positioning of sea cages at sites with high water current velocities expose the fish to a largely unknown environmental challenge. In this study we observed the swimming behaviour of Atlantic salmon (Salmo salar L.) at a ... -
The Well – Mixing skirt and freshwater lens concepts with smart-lighting and -feeding to enhance lice prevention and safeguard fish welfare
Wright, Daniel William; Stien, Lars Helge; Oppedal, Frode; Sievers, Michael; Ditria, Ellen; Trengereid, Henrik (Rapport fra havforskningen, Research report, 2019)A commercial scale sea-cage design, combining skirt and freshwater lens concepts with smart lighting and feeding for improved lice prevention and fish welfare, was trialed. Environment, lice levels and fish welfare were ... -
Thermal injuries in Atlantic salmon in a pilot Laboratory trial
Gismervik, Kristine; Gåsnes, Siri Kristine; Gu, Jinni; Stien, Lars Helge; Madaro, Angelico; Nilsson, Jonatan (Peer reviewed; Journal article, 2019)Thermal delousing is a new method for removing sea lice from farmed Atlantic salmon (Salmo salar L). We investigated thermally-related tissue injuries in Atlantic salmon in a pilot laboratory trial to describe the acute ... -
Tining av fryst laks, effekt av fryselagringstid og tineregime
Rotabakk, Bjørn Tore; Stien, Lars Helge; Skåra, Torstein (Nofima rapportserie, Research report, 2021)Pre-rigorfileterte, vakumpakkede laksefileter ble fryst inn ved hjelp av tørris umiddelbart etter slakting. Disse ble lagret i 1 og 4 måneder ved -30 °C. De fryste, vakumpakkende filetene ble tint enten raskt (i vann 4 °C, ... -
Towards cod without spawning: artificial continuous light in submerged sea-cages maintains growth and delays sexual maturation for farmed Atlantic cod Gadus morhua
Korsøen, Øyvind Johan; Dempster, Tim; Fosseidengen, Jan Erik; Karlsen, Ørjan; Oppedal, Frode; Stien, Lars Helge; Kristiansen, Tore S. (Journal article; Peer reviewed, 2013-06-04)Sexual maturation and spawning in sea-cages is a major production and environmental challenge for the Atlantic cod farming industry. Altered photoperiod has arrested sexual maturation in cod kept in indoor or covered ... -
Tredje samlerapport: Velferd for triploid laks i Nord-Norge - Sluttrapport, utsett 2019
Stien, Lars Helge; Sambraus, Florian; Kristiansen, Tore S; Fjelldal, Per Gunnar; Sæther, Per Anton; Martinsen, Lisbeth (Rapport fra havforskningen;2021 - 44, Research report, 2021)Denne rapporten tar for seg velferden til 14 grupper av triploid laks satt ut i Nord-Norge vår, sommer og høst 2019. To av gruppene satt ut om våren hadde perfekt utgangspunkt med god smoltkvalitet og feilfri transport. ... -
Triploid Atlantic salmon Salmo salar have a higher dietary phosphorus requirement for bone mineralization during early development
Sambraus, Florian; Hansen, Tom Johnny; Daae, Britt Sværen; Thorsen, Anders; Sandvik, Roar; Stien, Lars Helge; Fraser, Thomas; Fjelldal, Per Gunnar (Peer reviewed; Journal article, 2020)The effect of a dietary phosphorus regime in freshwater on vertebra bone mineralization was assessed in diploid and triploid Atlantic salmon, Salmo salar. Fish were fed either a low phosphorus (LP) diet containing 10.5 ... -
Triploidy leads to a mismatch of smoltification biomarkers in the gill and differences in the optimal salinity for post-smolt growth in Atlantic salmon
de Fonseka, Raneesha; Fjelldal, Per Gunnar; Sambraus, Florian; Nilsen, Tom Ole; Remø, Sofie C.; Stien, Lars Helge; Reinardy, Helena; Madaro, Angelico; Hansen, Tom Johnny; Fraser, Thomas (Peer reviewed; Journal article, 2021)Sterile triploid Atlantic salmon (Salmo salar) show inconsistent seawater grow-out, but the reason why remains unclear. The purpose of this study was to determine the salinity optima of triploid post-smolts. Diploids and ...