Browsing NTNU Open by Author "Olsen, Yngvar"
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A new Norwegian bioeconomy based on cultivation and processing of seaweeds: Opportunities and R&D needs
Skjermo, Jorunn; Aasen, Inga Marie; Arff, Johanne; Broch, Ole Jacob; Carvajal, Ana Karina; Christie, Hartvig C; Forbord, Silje; Olsen, Yngvar; Reitan, Kjell Inge; Rustad, Turid; Sandquist, Judit; Solbakken, Roar; Steinhovden, Kristine; Wittgens, Bernd; Wolff, Robert; Handå, Aleksander (Research report, 2014) -
A study of the influence of nitrate supply on intracellular protein and nitrogen components in the kelp Saccharina latissima
Zhou, Renbin (Master thesis, 2014)Saccharina latissima were cultivated in tanks with three different levels of nitrate supply. The temperature was around 12 to 18 ℃ and salinity was around 24 to 29 during the experiment. Seaweeds cultivated at Medium N ... -
A Study of the Seasonal Variation in Biochemical Composition of Saccharina latissima
Tønder, Tine Solvoll (Master thesis, 2014)Increasing concerns for climatic changes and increasing fuel cost have encouraged a movement towards alternative fuels, and the global interest and demand for biofuel is increasing. Commercially available biofuels today ... -
A systemic study of lipid metabolism regulation in salmon fingerlings and early juveniles fed plant oil
Jin, Yang; Olsen, Rolf Erik; Gillard, Gareth B.; Østensen, Mari-Ann; Korsvoll, Sven A.; Santi, Nina; Vik, Jon Olav; Sandve, Simen Rød; Olsen, Yngvar (Journal article; Peer reviewed, 2018)In salmon farming, the scarcity of fish oil has driven a shift towards the use of plant-based oil from vegetable or seed, leading to fish feed low in long-chain PUFA (LC-PUFA) and cholesterol. Atlantic salmon has the ... -
Assimilation of salmon feed and salmon feces by the great scallop (Pecten maximus)
Stensås, Lene (Master thesis, 2014)The primary objective of this Master s thesis was to study if organic waste particles released from cage fish farms could be assimilated by the great scallop (P. maximus) through a laboratory trial and a field trial. In ... -
Atlantic salmon raised with diets low in long-chain polyunsaturated n-3 fatty acids in freshwater have a Mycoplasma-dominated gut microbiota at sea
Jin, Yang; Angell, Inga Leena; Sandve, Simen Rød; Snipen, Lars-Gustav; Olsen, Yngvar; Rudi, Knut (Journal article; Peer reviewed, 2019)Factors affecting the establishment of the gut microbiota in animals living in marine environments remain largely unknown. In terrestrial animals, however, it is well established that the juvenile environment has a major ... -
Bacterial community composition responds to changes in copepod abundance and alters ecosystem function in an Arctic mesocosm study
Tsagaraki, Tatiana Margo; Pree, Bernadette; Leiknes, Øystein; Larsen, Aud; Bratbak, Gunnar; Øvreås, Lise; Egge, Jorun Karin; Spanek, Roman; Paulsen, Maria Lund; Olsen, Yngvar; Vadstein, Olav; Thingstad, T. Frede (Journal article; Peer reviewed, 2018)Combining a minimum food web model with Arctic microbial community dynamics, we have suggested that top-down control by copepods can affect the food web down to bacterial consumption of organic carbon. Pursuing this ... -
Biochemical composition of Rhodomonas baltica as a function of the dilution rate during steady rate of growth
Le, Hoang Bao Chau (Master thesis, 2013)The algae Rhodomonas baltica, Karsten was cultured in Guillard f-medium with the phosphate concentration reduced to 5 µmol/L. The cultures were diluted at seven different dilution rates corresponding approximately to growth ... -
Biofouling on salmon pen nets and cleaner fish shelters does not harbor planktonic stages of sea lice
Jevne, Lone Sunniva; Øvrelid, Margrete Slåtsve; Hagemann, Andreas; Bloecher, Nina; Steinhovden, Kristine; Båtnes, Anna Solvang; Olsen, Yngvar; Reitan, Kjell Inge (Peer reviewed; Journal article, 2020)The objective of the current study was to determine the extent to which planktonic sea lice (Lepeophtheirus salmonis Krøyer, 1838 and Caligus elongatus Nordmann, 1832) were present in the biofouling on open-sea net pens ... -
Biogeochemistry of iron in Patagonian fjords and waters of the Antarctic Peninsula
Puerto, Nicolas Sanchez (Doctoral theses at NTNU;2017:191, Doctoral thesis, 2017)Iron constitute an essential nutrient for marine life. Several metabolic processes in marine phytoplankton, are dependent on the presence of this trace element. Due to the chemistry of seawater, in certain marine ... -
Carbon sequestration by microbial carbon pump with production of recalcitrant dissolved organic matter in different marine environments
Avarachen, Mathew Kuttivadakkethil (Doctoral theses at NTNU;2023:331, Doctoral thesis, 2023)The carbon dioxide in the atmosphere is causing global warming and other associated climate change events. The world countries have pledged to cut down the carbon dioxide emissions to counter act these climate change ... -
Characterisation of changes in dissolved organic matter (DOM) composition of recirculating aquaculture system (RAS) sludge at different redox stages.
Gansert, Clara (Master thesis, 2021)The dissolved organic carbon (DOC) pool is a highly diverse and important part of the marine carbon cycle and can be altered by microorganisms. This study was conducted to gain further knowledge about changes in DOC ... -
Chemical composition and release rate of waste discharge from an Atlantic salmon farm with an evaluation of IMTA feasibility
Wang, Xinxin; Andresen, Kjersti; Handå, Aleksander; Jensen, Bjørn; Reitan, Kjell Inge; Olsen, Yngvar (Journal article; Peer reviewed, 2013)The carbon (C), nitrogen (N) and phosphorus (P) compositions of salmon feed, fish and faeces were studied at a salmon farm in Badstuvika (63°31’N, 9°9’E) in central Norway. These data were used to estimate the release rates ... -
Cold storage of eggs of Acartia tonsa Dana: effects of light, salinity and short-term temperature elevation on 48-h egg hatching success
Hagemann, Andreas (Master thesis, 2011)Copepods play a key role in the marine ecosystem where they form a vital trophodynamic link between primary and tertiary producers, and are the dominant prey of many marine fishes during their larval stage. Because of their ... -
Commensal and opportunistic bacteria present in the microbiota in atlantic cod (Gadus morhua) larvae differentially alter the hosts’ innate immune responses
Vestrum, Ragnhild Inderberg; Forberg, Torunn; Luef, Birgit; Bakke, Ingrid; Winge, Per; Olsen, Yngvar; Vadstein, Olav (Journal article; Peer reviewed, 2022)The roles of host-associated bacteria have gained attention lately, and we now recognise that the microbiota is essential in processes such as digestion, development of the immune system and gut function. In this study, ... -
Comparative transcriptomics reveals domestication‐associated features of Atlantic salmon lipid metabolism
Jin, Yang; Olsen, Rolf Erik; Harvey, Thomas Nelson; Østensen, Mari-Ann; Li, Keshuai; Santi, Nina; Vadstein, Olav; Bones, Atle M.; Vik, Jon Olav; Sandve, Simen Rød; Olsen, Yngvar (Peer reviewed; Journal article, 2020)Domestication of animals imposes strong targeted selection for desired traits but can also result in unintended selection due to new domestic environments. Atlantic salmon was domesticated in the 1970s and has subsequently ... -
Correlation between microbiota and growth in Mangrove Killifish (Kryptolebias marmoratus) and Atlantic cod (Gadus morhua)
Forberg, Torunn; Sjulstad, Eli Bjørnø; Bakke, Ingrid; Olsen, Yngvar; Hagiwara, Atsushi; Sakakura, Yoshitaka; Vadstein, Olav (Journal article; Peer reviewed, 2016)The vertebrate gut is host to large communities of bacteria, and one of the beneficial contributions of this commensal gut microbiota is the increased nutritional gain from feed components that the host cannot degrade on ... -
Cultivation of Saccharina latissima (Phaeophyceae) in temperate marine waters: Nitrogen uptake kinetics, Growth characteristics and Chemical composition
Forbord, Silje (Doctoral theses at NTNU;2020:333, Doctoral thesis, 2020)Det er en økende interesse for dyrking av tang og tare i Norge og resten av Europa, og sukkertare (Saccharina latissima) er en av de mest aktuelle artene som på sikt kan dekke behovene for mat, fôr, materialer og energi ... -
Detachment and re-attachment of Salmon lice during full-scale delousing operations on Salmon farms
Guttu, Ane Maria; Båtnes, Anna Solvang; Aunsmo, Arnfinn; Bjørnland, Thea; Olsen, Yngvar (Peer reviewed; Journal article, 2024)This study examined salmon lice (Lepeophtheirus salmonis) numbers during different full-scale lice treatments of salmon, with focus on detachment during crowding and re-attachment post-treatment. Data was collected from ... -
Development of biofouling on salmon cage nets and the effects of anti-fouling treatments on the survival of the hydroid (Ectopleura larynx) (Ellis & Solander, 1786)
Kassah, Jemimah Etornam (Master thesis, 2012)Biofouling has become a serious problem for farmers in the Norwegian finfish aquaculture industry in recent years; with the hydroid Ectopleura larynx dominating the fouling community in southwestern and mid-Norwegian waters. ...