Now showing items 61-80 of 284

    • Consumers’ Value Perceptions of Seafood 

      Hoque, Mohammed Ziaul (Doctoral thesis; Doktorgradsavhandling, 2022-04-08)
      Consumers’ perception of seafood products plays a critical role in determining their consumption behaviour. As a great quantity of seafood is produced by aquaculture, specifically farmed fish, consumers’ perception of farmed fish is crucial. In recent years, consumers in developing and emerging countries have increased their concern about seafood safety. This thesis investigates consumers’ ...
    • Climate warming impact on the deep demersal fish community East of Greenland 

      Emblemsvåg, Margrete (Doctoral thesis; Doktorgradsavhandling, 2022-04-06)
      This thesis presents a study of the impact of climate warming on deep demersal fish communities East of Greenland, in a transition zone between Atlantic and Arctic waters. Climate change was expected to affect fish community composition and functional characterization via poleward distributional shifts and changes in abundance. To assess the climate driven effects on fish communities, I used long ...
    • Bioprospecting of Arctic marine microorganisms. Exploring microbial secondary metabolite production using the one strain-many compounds approach: isolation and characterization of secondary metabolites 

      Kristoffersen, Venke (Doctoral thesis; Doktorgradsavhandling, 2021-12-20)
      <p>Natural products have been used by humans since ancient times as benefactors for improved health. Prior to modern medicine and chemistry, these compounds remained hidden in the plants, animals and other organisms used to heal inflammation, wounds, headache and stomachache among other conditions. Since the start of modern drug discovery with isolation of morphine in 1805, numerous natural products ...
    • Bycatch reduction and alternative exploitation patterns in demersal trawl fisheries of the Baltic Sea and the North Sea 

      Santos, Juan (Doctoral thesis; Doktorgradsavhandling, 2021-12-17)
      <p>In the Baltic Sea and North Sea, the sustainability of bottom-trawl fisheries is threatened by many issues, such as the impact of climate change on exploited demersal stocks, long-term overfishing, and the European Landing Obligation for quoted species. This thesis identifies challenges to bycatch and harvesting patterns of targeted species in four relevant Baltic Sea and North Sea bottom-trawl ...
    • Antecedents of consumer evaluation and consumption of functional food 

      Nystrand, Bjørn Tore (Doctoral thesis; Doktorgradsavhandling, 2021-12-15)
      The overall aim of this dissertation is to improve the theoretical and empirical understanding of consumers’ behavioral tendencies toward functional food consumption. The main purpose is to provide a deeper understanding of antecedents that are relevant for explaining consumer evaluation of functional food and consumption behavior. Functional foods are food products that have been enriched to make ...
    • Effect of light quality on the biosynthesis of flavonoids and sugars in bilberry (Vaccinium myrtillus L.) 

      Samkumar, Amos (Doctoral thesis; Doktorgradsavhandling, 2021-12-09)
      Berries are abundant in bioactive compounds. Bilberry or European blueberry (<i>Vaccinium myrtillus</i> L.) is in particular gaining worldwide attention being one of the best natural sources of antioxidant rich phenolics that accumulate in both skin and flesh during fruit ripening. Alongside, the ubiquitous presence of anthocyanins and related flavonoids, it also contains other compounds such as ...
    • Microbial community structure associated to Arctic cold seeps 

      Carrier, Vincent (Doctoral thesis; Doktorgradsavhandling, 2021-11-29)
      Cold seeps are locations on the seafloor where CH<sub>4</sub> migrates from reservoirs below sediments towards the atmosphere, sustaining thereby a high microbial and macrofaunal biomass and a diversity contrasting from the surrounding seafloor. The oxidation of methane and sulphide are typically the main sources of primary productivity of these ecosystems and have therefore gained a particular ...
    • Economic incentives in outpatient care and patient demand for pharmaceuticals. A study of antibiotics and addictive drugs prescriptions 

      Zykova, Yana (Doctoral thesis; Doktorgradsavhandling, 2021-12-07)
      The questions asked in this thesis relate to the economic incentives and characteristics of the health care market, which may result in suboptimal drug prescription. We consider two types of pharmaceuticals, such as antibiotics and addictive drugs. These pharmaceuticals are interesting because their use/misuse is associated with costs both at the individual and societal levels. The decision about ...
    • Climate change impact on high latitude freshwater fish populations 

      Smalås, Aslak (Doctoral thesis; Doktorgradsavhandling, 2021-11-12)
      <p>Climate change is one of the greatest threats to animal wildlife in high latitude freshwater ecosystems. Climate warming is rapidly increasing water temperatures in these areas, affecting biological processes of ectotherms such as growth, maturation and reproduction, which in turn trigger population responses. The magnitude of the effects of climate warming will vary depending on the thermal niche ...
    • Long-term dynamics of metazoan parasites in an age- and size-structured host population 

      Henriksen, Eirik Haugstvedt (Doctoral thesis; Doktorgradsavhandling, 2021-10-29)
      <p>Parasites negatively affect hosts and may constitute serious management problems. At the same time, parasites are integral components of ecosystems and represent a substantial part of the biodiversity on earth. Understanding the ecological factors that influence the abundance and distribution of parasite populations is therefore important from a management perspective, but also to understand the ...
    • Game-based learning for marine resource management: Reflections on using games in the Bachelor of Science in Fisheries and Aquaculture 

      Weines, Jørn (Doctoral thesis; Doktorgradsavhandling, 2021-09-03)
      This dissertation is a case-study of the development and introduction of game-based learning in the Bachelor of Science in Fisheries and Aquaculture at the Norwegian College of Fishery Science. The use of games for learning has long traditions, but is currently receiving increased attention from scholars in light of the increased focus on active learning in higher education institutions. The ...
    • Bioprospecting of marine phytoplankton from large scale cultivation - Effect of culture conditions on bioactivity and biochemistry of the diatom Porosira glacialis 

      Osvik, Renate Døving (Doctoral thesis; Doktorgradsavhandling, 2021-06-23)
      The diatoms make up the largest and most important group of marine microalgae. They are responsible for a quarter of all inorganic carbon fixation in the ocean and are thus of immense importance for global CO2 sequestration. This makes them good candidates for biological carbon capture and utilization (CCU) by mass cultivation using CO2 emissions from industrial point sources. Large scale cultivation ...
    • Bioprospecting of marine fungi from the High Arctic: A study of high latitude marine fungi from understudied taxa; bioactivity potential, taxonomy and genomics 

      Hagestad, Ole Christian (Doctoral thesis; Doktorgradsavhandling, 2021-06-17)
      Marine fungi comprise a group of organisms that have been overlooked for a long time. Research interest has increased with the realization of the important ecological role and rich chemistry of marine fungi. Marine fungi have yielded thousands of new natural products the last decade, but many taxa remain unstudied. Marine fungi from the Arctic have not been reported in literature in regard to ...
    • Fisher's effort allocation behavior and decision-making process in the Norwegian trawl fishery 

      Alizadeh Ashrafi, Tannaz (Doctoral thesis; Doktorgradsavhandling, 2021-06-09)
      The empirical investigation of fishers’ harvest behavior is an important but neglected strand of fishery science. In this thesis, we fill some of this gap by developing empirical models to investigate trawlers’ harvest behavior over time and space in codfish fisheries, managed using individual vessel quotas (IVQs). Fishers’ harvest behavior is reflected in the decision-making processes underlying ...
    • Porosira glacialis as a possible source of lipids for human consumption and aquaculture feed 

      Dalheim, Lars (Doctoral thesis; Doktorgradsavhandling, 2021-05-20)
      Det er et stort behov for marine langkjedede omega-3 fettsyrer både til humant konsum og til fiskefôr. De langkjedede omega-3 fettsyrene EPA og DHA har gunstige helseeffekter for både mennesker og fisk. Mengden villfanget fisk har de siste 40 årene nådd maksimal utnyttelse mens volumet av oppdrettsfisk har økt betraktelig. Mangelen på marint råstoff har ført til en økt andel terrestrisk råstoff i ...
    • Towards mass cultivation of diatoms as a source of marine lipids 

      Svenning, Jon Brage (Doctoral thesis; Doktorgradsavhandling, 2021-04-23)
      The global demand for the long-chain omega-3 fatty acids EPA and DHA is increasing, and the traditional sources of these fatty acids, fish oils, are no longer able to sustain the demand. This shortage is mainly a result of the surging requirement of EPA and DHA as ingredients in fish feed for aquaculture, and as dietary supplements for human consumption. As a result, there is an increased interest ...
    • Photoperiodic history-dependent preadaptation of the smolting gill. Novel players and SW immediate response as markers of growth and welfare 

      Iversen, Marianne (Doctoral thesis; Doktorgradsavhandling, 2021-04-16)
      This thesis presents a rich introduction to the evolution, life history and physiology of Atlantic salmon, with a special emphasis on the developmental transitions (termed smolting) juvenile salmon pass through has they prepare to migrate from their native freshwater habitat to the sea. The introduction provides a comprehensive background on chronobiology and osmoregulation in fishes and links this ...
    • Circadian-based processes in the High Arctic: activity, thermoregulation and photoperiodism in the Svalbard ptarmigan (Lagopus muta hyperborea) 

      Appenroth, Daniel (Doctoral thesis; Doktorgradsavhandling, 2021-04-15)
      <p>This thesis addresses aspects of the circadian and photoperiodic system in a High Arctic bird: the Svalbard ptarmigan (<i>Lagopus muta hyperborea</i>, Sundevall 1845). The most northern resident bird inhabits a unique photic environment; 2/3 of its year it spends either under a night without sunrise (polar night) or under a never setting Sun (polar day). Studies so far suggest a temporal loss of ...
    • Microbial diversity and ecology in the coastal Arctic seasonal ice zone 

      Vonnahme, Tobias (Doctoral thesis; Doktorgradsavhandling, 2021-03-11)
      Marine microbes are crucial for the marine food web and carbon cycle. Algae are the main source of organic matter in the oceans with algae blooms triggering reoccurring bacterial succession patterns. Bacteria can recycle nutrients from organic matter coming from land or algae, fueling regenerated primary production. Terrestrial freshwater inputs can have substantial impacts on Arctic marine microbes ...
    • Present and future time perspectives and health behavior 

      Pozolotina, Tatiana (Doctoral thesis; Doktorgradsavhandling, 2021-03-12)
      <p><i>Background and purpose: </i>Lifestyle diseases are the leading cause of life-time disability and death in modern society. Knowledge of the underlying causes and mechanisms of health behavior choices is crucially important when developing health-promoting campaigns and planning health behavior interventions. This dissertation aimed to advance our understanding of the relationship between time ...