Browsing NTNU Open by Author "Olsen, Rolf Erik"
Now showing items 61-80 of 92
-
Molecular quantification of sea lice in and around sea cages - A study comparing the molecular quantification method qPCR against a conventional method
Ingebrigtsen, Henriette (Master thesis, 2017)The aquaculture production of atlantic salmon (Salmo salar) have been growing in a steady pace, but for further expansion of the industry it is necessary to solve environmental challanges, including those related to sea ... -
Molecular Regulation of Biosynthesis of Long Chain Polyunsaturated Fatty Acids in Atlantic Salmon
Datsomor, Alex Kojo; Gillard, Gareth Benjamin; Jin, Yang; Olsen, Rolf Erik; Sandve, Simen Rød (Peer reviewed; Journal article, 2022)Salmon is a rich source of health-promoting omega-3 long chain polyunsaturated fatty acids (n-3 LC-PUFA), such as eicosapentaenoic acid (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3). The LC-PUFA biosynthetic pathway ... -
Nephrocalcinosis in juvenile farmed Atlantic salmon
Klykken, Christine (Doctoral theses at NTNU;2023:363, Doctoral thesis, 2023)English summary Good health and welfare of farmed fish is crucial for further growth and development of the fish farming industry in Norway and abroad. Systematic work is being done at all levels of the industry with ... -
Not too slow, not too fast: water currents affect group structure, aggression and welfare in postsmolt Atlantic salmon Salmo salar
Solstorm, Frida; Solstorm, David; Oppedal, Frode; Olsen, Rolf Erik; Stien, Lars Helge; Fernø, Anders (Journal article; Peer reviewed, 2016)Increased swimming speed of Atlantic salmon is generally considered an improvement to welfare under aquaculture settings, as group structure is improved and agonistic behaviour reduced. As such, establishing fish farms in ... -
Nuclease-Treated Stabilized Fermentation Product of Cetobacterium somerae Improves Growth, Non-specific Immunity, and Liver Health of Zebrafish (Danio rerio)
Xie, Mingxu; Hao, Qiang; Xia, Rui; Olsen, Rolf Erik; Ringø, Einar; Yang, Yalin; Zhang, Zhen; Ran, Chao; Zhou, Zhigang (Journal article; Peer reviewed, 2022) -
Oil from transgenic Camelina sativa containing over 25 % n-3 long-chain PUFA as the major lipid source in feed for Atlantic salmon (Salmo salar)
Betancor, Mónica B.; Li, Keshuai; Bucerzan, Valentin S.; Sprague, Matthew; Sayanova, Olga; Usher, Sarah; Han, Lihua; Norambuena, Fernando; Torrissen, Ole; Napier, Johnathan A.; Tocher, Douglas R.; Olsen, Rolf Erik (Journal article; Peer reviewed, 2018)Facing a bottleneck in the growth of aquaculture, and a gap in the supply and demand of the highly beneficial n-3 long-chain PUFA (LC-PUFA), sustainable alternatives to traditional marine-based feeds are required. Therefore, ... -
Omega-3 long-chain polyunsaturated fatty acids, EPA and DHA: Bridging the gap between supply and demand
Tocher, Douglas R.; Betancor, Mónica B.; Sprague, Matthew; Olsen, Rolf Erik; Napier, Johnathan A. (Journal article; Peer reviewed, 2019)The omega-3 (n-3) long-chain polyunsaturated fatty acids (LC-PUFA), eicosapentaenoic (EPA, 20:5n-3) and docosahexaenoic (DHA, 22:6n-3) acids, are well accepted as being essential components of a healthy, balanced diet, ... -
Optical measurement of tissue perfusion changes as an alternative to electrocardiography for heart rate monitoring in Atlantic salmon (Salmo salar)
Svendsen, Eirik; Økland, Finn; Føre, Martin; Randeberg, Lise Lyngsnes; Finstad, Bengt; Olsen, Rolf Erik; Alfredsen, Jo Arve (Peer reviewed; Journal article, 2021)Background: Welfare challenges in salmon farming highlights the need to improve understanding of the fish’s response to its environment and rearing operations. This can be achieved by monitoring physiological responses ... -
Optimalisering av biologisk filtrering i MBBR for RAS-anlegg: Faktorer som påvirker filtreringsytelse og tiltak for å sikre høy vannkvalitet
Løge, jens; Søbstad, Johan (Bachelor thesis, 2023)Denne bacheloroppgaven er basert på en omfattende litteraturstudie som har til hensikt å finne ut av hvilke faktorer som påvirker biologisk filtreringsytelse i MBBR-systemer for RAS-anlegg. Målet med studien er å identifisere ... -
Oxidative status and intestinal health of gilthead sea bream (Sparus aurata) juveniles fed diets with different ARA/EPA/DHA ratios
Magalhaes, Rui; Guerreiro, I.; Santos, R. A.; Coutinho, F.; Couto, A.; Serra, C. R.; Olsen, Rolf Erik; Peres, H.; Oliva-Teles, A (Peer reviewed; Journal article, 2020)The present work assessed the effects of dietary ratios of essential fatty acids, arachidonic (ARA), eicosapentaenoic (EPA) and docosahexaenoic acid (DHA), on liver and intestine oxidative status, intestinal histomorphology ... -
Paraprobiotics and postbiotics of probiotic lactobacilli, their positive effects on the host and action mechanisms: A review
Teame, Tsegay; Wang, Anran; Xie, Mingxu; Zhang, Zhen; Yang, Yaling; Ding, Qianwen; Gao, Chenchen; Olsen, Rolf Erik; Ran, Chao; Zhou, Zhigang (Peer reviewed; Journal article, 2020)Lactobacilli comprise an important group of probiotics for both human and animals. The emerging concern regarding safety problems associated with live microbial cells is enhancing the interest in using cell components and ... -
Physiological changes observed in farmed Atlantic salmon (Salmo salar L.) with nephrocalcinosis
Klykken, Christine; Reed, A.K.; Dalum, Alf Seljenes; Olsen, Rolf Erik; Moe, Morten Kaare; Attramadal, Kari; Boissonnot, Lauris Jeannine Ernestine (Peer reviewed; Journal article, 2022)There is a growing concern for fish health and welfare in the salmon industry in Norway. Nephrocalcinosis, described as mineral deposits within the kidney, is increasingly observed. However, little is known about its ... -
Potensialet for utvidet kontroll av vannkvalitet og fiskevelferdi i RAS ved bruk av maskinlæring
Bakken, Andrine; Kvarsvik, Johanne; Mjøen, Julie H. (Bachelor thesis, 2023)Innenfor landbasert lakseoppdrett benyttes resirkulerende akvakultursystemer for å gjenbruke driftsvannet flere ganger. Fiskens metabolisme og fôring produserer avfallsstoffer som kan forårsake redusert vannkvalitet i ... -
Propionate induces intestinal oxidative stress via Sod2 propionylation in zebrafish
Ding, Qianwen; Zhang, Zhen; Li, Yu; Liu, Hongliang; Hao, Qiang; Yang, Yalin; Ringø, Einar; Olsen, Rolf Erik; Clarke, Jihong Liu; Ran, Chao; Zhou, Zhigang (Peer reviewed; Journal article, 2021)Propionate and propionyl-CoA accumulation have been associated with the development of mitochondrial dysfunction. In this study, we show that propionate induces intestinal damage in zebrafish when fed a high-fat diet (HFD). ... -
Radiological detection of nephrocalcinosis in farmed Atlantic salmon Salmo salar L.
Klykken, Christine; Dalum, Alf Seljenes; Reed, Anne Katrine; Attramadal, Kari; Olsen, Rolf Erik; Boissonnot, Lauris Jeannine Ernestine (Journal article; Peer reviewed, 2022) -
Red and white chinook salmon (Oncorhynchus tshawytscha): Differences in the transcriptome profile of muscle, liver, and pylorus
Madaro, Angelico; Torrissen, Ole; Whatmore, Paul; Lall, Santosh P.; Schmeisser, Jerome; Verlhac Trichet, Viviane; Olsen, Rolf Erik (Journal article; Peer reviewed, 2020)Astaxanthin (Ax), the main carotenoid responsible for the distinct red flesh color in salmonids (Oncorhynchus, Salvelinus, Salmo, and Parahucho), is added to the diet of farmed fish at a substantial cost. Despite the great ... -
Research progress on gut health of farmers teleost fish: a viewpoint concerning the intestinal mucosal barrier and the impact of its damage
Zhang, Hongling; Ran, Chao; Teame, Tsegay; Ding, Qianwen; Hoseinifar, Seyed Hossein; Xie, Mingxu; Zhang, Zhen; Yang, Yalin; Olsen, Rolf Erik; Gatlin, Delbert M; Ringø, Einar; Duan, Ming; Zhou, Zhigang (Journal article; Peer reviewed, 2020) -
Risk of Feed Additives in High-lipid Fish Diets: Effects of Propionate and Docosahexaenoic Acid on Liver and Intestinal Health in Zebrafish (Danio rerio Hamilton-Buchanan, 1822)
Ding, Qianwen (Doctoral theses at NTNU;2022:378, Doctoral thesis, 2022)The use of high-fat diets (HFDs) is a common practice employed to improve growth and feed efficiency in aquaculture. Propionic acid and its sodium salt are widely used in Asian fish feeds as a safe inhibitor of mold growth, ... -
Skin mucus of gilthead sea bream (sparus aurata l.). protein mapping and regulation in chronically stressed fish
Pérez-Sánchez, Jaume; Terova, Genciana; Simó-Mirabet, Paula; Rimoldi, Simona; Folkedal, Ole; Calduch-Giner, Josep Alvar; Olsen, Rolf Erik; Sitjà-Bobadilla, Ariadna (Journal article; Peer reviewed, 2017)The skin mucus of gilthead sea bream was mapped by one-dimensional gel electrophoresis followed by liquid chromatography coupled to high resolution mass spectrometry using a quadrupole time-of-flight mass analyzer. More ... -
Targeted mutagenesis of Δ5 and Δ6 fatty acyl desaturases induce dysregulation of lipid metabolism in Atlantic salmon (Salmo salar)
Jin, Yang; Datsomor, Alex Kojo; Olsen, Rolf Erik; Vik, Jon Olav; Torgersen, Jacob Seilø; Edvardsen, Rolf Brudvik; Wargelius, Anna; Winge, Per; Grammes, Fabian (Peer reviewed; Journal article, 2020)Background With declining wild fish populations, farmed salmon has gained popularity as a source for healthy long-chain highly unsaturated fatty acids (LC-HUFA). However, the introduction of plant oil in farmed salmon ...