Doktorgradsavhandlinger (BFE-fak): Recent submissions

Now showing items 241-260 of 277

    • Granularity and its importance for traceability in seafood supply chains 

      Karlsen, Kine Mari (Doctoral thesis; Doktorgradsavhandling, 2011-08-26)
      The purpose of this thesis was to study granularity and its importance for traceability in seafood supply chains. The following hypothesis was applied in this thesis: The implementation of traceability of seafood is affected by the granularity level of the traceable units. Three sub-tasks were carried out to test the hypothesis: 1) identify critical traceability points (CTPs) of seafood products, ...

    • Poverty in Small-Scale Fisheries : Governance Challenges in Lake Victoria Fishing Communities, Tanzania 

      Onyango, Paul Ochieng (Doctoral thesis; Doktorgradsavhandling, 2011-08-23)
      The pursuit of a world without poverty is without doubt among the leading global challenges not only for governments but also the poor themselves. This challenge is also in small-scale fishing communities where poverty is persistent and has become a thorny issue to the poor as well as governing actors. Strategies have been formulated and implemented but the results have not been up to the expectations. ...

    • Staying alive : the survival and importance of Atlantic salmon post-spawners 

      Halttunen, Elina (Doctoral thesis; Doktorgradsavhandling, 2011-08-19)
      Summary Atlantic salmon (Salmo salar L.) repeat-spawners might play an important role in population persistence by increasing both total recruitment and long-term stability of a population. This is because repeat spawners return at larger sizes and with greater fecundity than first time spawners, and the large majority of repeat-spawners are females. Nevertheless, little knowledge exists of this ...

    • Scavenging amphipods in the high Arctic : Studies of benthic and sympagic amphipods in the genera Onisimus and Anonyx 

      Nygård, Henrik (Doctoral thesis; Doktorgradsavhandling, 2011-05-02)
      The main objective of this study was to increase our knowledge about the ecology of scavenging amphipods, particularly amphipods within the genera Onisimus and Anonyx. Specifically, the emphasis was to increase the knowledge of ice-associated (sympagic) Onisimus-species, but as these species are rather inaccessible, an approach using benthic congeners as proxies was chosen. By studying the shallow-water ...

    • Industriell nyskapning : en undersøkelse av institusjonelle forutsetninger 

      Trondsen, Torbjørn (Doctoral thesis; Doktorgradsavhandling, 1985-05)

    • Some methodological issues in economic evaluation in health care 

      Olsen, Jan Abel (Doctoral thesis; Doktorgradsavhandling, 1993)

    • The immune system of Atlantic cod : with emphasis on intestinal immunology 

      Inami, Makoto (Doctoral thesis; Doktorgradsavhandling, 2011-04-08)
      Torskeoppdrett er en lovende industri i Norge, men problemer med blant annet bakteriesykdommer gjør at næringen fortsatt har problemer med å etablere seg. For å få kontroll med sykdomsproblemene i næringen, er grunnleggende kunnskap om hvordan torsken beskytter seg mot infeksjoner nødvendig. Hensikten med dette doktorgradsarbeidet har vært å studere forsvarssystemet hos torsk, med et spesielt fokus ...

    • Måling av produktivitet : en sammenligning av ulike metoder, med spesiell vekt på Data Envelopment Analysis 

      Vassdal, Terje (Doctoral thesis; Doktorgradsavhandling, 1988-09)

    • Post mortem proteolytic degradation of myosin heavy chain in skeletal muscle of Atlantic cod 

      Wang, Pål Anders (Doctoral thesis; Doktorgradsavhandling, 2011-01-28)
      One of the most important parameters of quality regarding meat both from mammals and fish is texture. The post mortem degradation of muscle and connective tissue proteins during tenderization of meat from warm-blooded animals is unwanted in fish due to a loss of product quality. Soft fillet and gaping are common problems both in wild and farmed cod and have huge impact on the quality and the consumers’ ...

    • Marine Ecosystem Governance in the Making : Planning for petroleum activity in the Barents Sea-Lofoten area 

      Knol, Maaike (Doctoral thesis; Doktorgradsavhandling, 2011-03-25)
      Expanding petroleum activity in the Barents Sea-Lofoten area has worked as a catalyst for the development and introduction of the first integrated, ecosystem-based management plan in Norway. This plan sets the framework, in particular, for further petroleum activities. Building on Science and Technology Studies (STS) this thesis provides an analysis of the practices and instrumentation of marine ...

    • Moderators in the relationship between satisfaction and loyalty of Vietnamese fish products consumers 

      Tuu, Huy Ho (Doctoral thesis; Doktorgradsavhandling, 2011-02-26)
      This study first discusses and tests the strength and possible different forms of the relationships between satisfaction and loyalty. Secondly, it focuses on if, and how, satisfaction strength properties (e.g. involvement, ambivalence, knowledge, and certainty) moderate the satisfaction–loyalty relationship. It also extends to discuss and test the role of perceived risk in the satisfaction–loyalty ...

    • Food safety of salt-cured cod products : effects of salt-curing, rehydration and thermal treatmenton survival, growth and invasiveness of Listeria spp. 

      Lorentzen, Grete (Doctoral thesis; Doktorgradsavhandling, 2010-11-26)
      Salt-cured and dried salt-cured (klipfish) cod (Gadus morhua L.) are highly appreciated. Salt fish and klipfish are mainly prepared by rehydration to lower the level of salt. The rehydrated cod can be used in several dishes and consumption of these products has been considered safe due to the high level of salt. The overall aim of the thesis was to study the food safety of salt-cured fish products ...

    • Factors affecting implementation of the information exchange for traceability in food supply chains 

      Donnelly, Kathryn Anne-Marie (Doctoral thesis; Doktorgradsavhandling, 2010-11-04)
      The globalisation and intensification of food production has led to food related health incidents. These incidents range from BSE in cattle to illegally high levels of dioxins in chicken feed (Carriquiry and Babcock, 2007, Caswell, 2000, Elbers et al., 2001, Fallon, 2001, Hobbs, 2004, Madec et al., 2001, Ozawa et al., 2001, Sporleder and Goldsmith, 2001). The modern consumer is increasingly ...

    • Risk sensitive reproductive strategies : the effect of environmental unpredictability 

      Bårdsen, Bård-Jørgen (Doctoral thesis; Doktorgradsavhandling, 2009-02-13)
      A crucial task in ecology is to quantify trade offs between competing demographic processes for experienced by individuals that inhabit unpredictable environments. Perhaps the most widely studied trade off is that between current reproduction and future survival (‘the cost of reproduction’). While experimental studies have been widely used to quantify life history strategies in birds, virtually ...

    • Neuronal hypoxia tolerance in diving endotherms 

      Ludvigsen, Stian (Doctoral thesis; Doktorgradsavhandling, 2010-08-20)
      The thesis “Neuronal hypoxia tolerance in diving endotherms” sheds light on mechanisms giving diving animals, such as the hooded seal, impressive dive capabilities of 1 hr duration down to 1000 m depth. In spite of enhanced capacity to store oxygen in their body and an ability to reduce their oxygen-consumption, these animals can resurface with blood oxygen values so low that a human being in the ...

    • Antimicrobial natural products from Arctic and sub-Arcticmarine invertebrates 

      Tadesse, Margey (Doctoral thesis; Doktorgradsavhandling, 2010-09-17)
      Infectious diseases are a leading cause of death world-wide and there is a growing need for new anti-infective agents to combat multi-resistant strains of bacteria and fungi. Marine natural products are promising sources of novel antimicrobial compounds. In the present thesis, an investigation into the antimicrobial metabolites of Arctic and sub-Arctic marine invertebrate species is presented. ...

    • Consideration set size and choice in fish consumption : the influence of attitude, knowledge, convenience, and category presentation 

      Rørtveit, Asbjørn Warvik (Doctoral thesis; Doktorgradsavhandling, 2010-06-11)
      <i>Purpose</i> – Three main objectives are defined in this thesis: 1) To determine the extent to which the nature of a consideration set affects consumer choice; 2) To investigate how consumer attitudes, knowledge, and convenience motivations affect the formation of a consideration set; and 3) To investigate how category presentation moderates the relationship between convenience motivations and ...

    • Reproductive behaviour and sex trait allocations in an external fertilizer – the Charr (Salvelinus alpinus) 

      Figenschou, Lars (Doctoral thesis; Doktorgradsavhandling, 2010-05-12)
      This thesis illuminates several aspects of mate choice and sexual selection in a species with external fertilization and no parental care. At a general level we have contributed to the basic framework within evolutionary biology and ecology and at a more specific level, as the proximate mechanisms controlling the associations between immune response, parasite intensities and traits indicative of ...

    • Essays on the economics of marine protected areas and fisheries management 

      Quach, Thi Khanh Ngoc (Doctoral thesis; Doktorgradsavhandling, 2009-11-20)
      Even though the oceans occupy more than 70% of the earth’s surface and 95% of the biosphere (National Research Council, 2001), marine habitats have undergone a substantial decline over the last few decades, and most of which is attributable to fishing. In this regard, marine reserves or marine protected areas (MPAs) are proposed as tools to relieve stresses on marine resources and ecosystems. Despite ...

    • Studies of infectious pancreatic necrosis virus (IPNV) and immune evasion strategies 

      Skjesol, Astrid (Doctoral thesis; Doktorgradsavhandling, 2009-10-23)
      Infectious pancreatic necrosis (IPN) is a highly contagious disease which causes huge economic loss to the salmon farming industry world wide. The causative agent, the IPN virus (IPNV), is a dsRNA, non-enveloped virus with two genomic segments encoding five viral proteins, VP1-VP5. <br>Available vaccines against this disease give only partial protection. In order to optimize vaccine efficacies, ...