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Now showing items 695-714 of 1576
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Governing the welfare of Norwegian farmed salmon: three conflict cases
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-10)To obtain insight into perceptions of how fish welfare and health is governed in Norwegian aquaculture, this study investigates three conflict cases: salmon lice, pancreas disease and farm siting. Using surveys and in-depth interviews, it highlights challenges and solutions as perceived from different professional groups. The results show that the current inflexible limit of the number of salmon ... -
Green movements below the surface
(Master thesis; Mastergradsoppgave, 2021-05-18)Macroalgae can benefit society in a variety of ways, and there is a lot of potential for cultivation of macroalgae in Norway. A sustainable development of this industry is needed to make use of these benefits, today and in the future. Hence, it is asked which opportunities and barriers exist in developing the industry and how the barriers are affecting this development. Inspired by a Grounded Theory ... -
The greening of Norwegian salmon production
(Journal article; Peer reviewed; Tidsskriftartikkel, 2015-11-16)The Norwegian salmon industry has, in terms of production and economic results, been a great success. However, due to environmental problems such as sea lice and escapes, the industry encounters increasing resistance from many quarters, headed by the wild salmon sport fishers. In order to improve the image of the industry, the fisheries authorities have suggested four new reforms that all ... -
A growth comparison of allopatric and sympatric whitefish
(Master thesis; Mastergradsoppgave, 2021-05-27)The purpose of this study was to see if growth and size at maturity were different between a LSR-whitefish morph living in allopatry and one living in sympatry with the DR-morph. Here, I hypothesized that somatic growth in monomorphic LSR-whitefish would be greater. Further, that the age at maturation would be lower for the monomorphic LSR-whitefish than that of the polymorphic LSR-whitefish. As a ... -
Growth performance, hepatic enzymes, and gut health status of common carp (Cyprinus carpio) in response to dietary Cetobacterium somerae fermentation product
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-15)Intensive aquaculture practices compromise the health of fish. Probiotics especially those isolated from aquatic animals play important roles in improving fish health. The aim of the study was to evaluate the effects of stabilized fermentation product of Cetobacterium somerae (XMX-1) on the growth performance, gut and liver health of common carp. A total of 300 carps (initial weight of 2.32 ± 0.02 ... -
Growth strategies of Chlorella vulgaris in seawater for a high production of biomass and lipids suitable for biodiesel
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-09)Chlorella vulgaris is a freshwater microalga that synthesises large amounts of saturated lipids, which makes it suitable for production of bioenergy and biofuels. Since its cultivation usually requires freshwater, it competes with agriculture, economic development and ecological conservation for this limited natural resource. This study investigated the possibility of the partial replacement of ... -
Grønlandsselens (Pagophilus groenlandicus) beiting om sommeren i åpent farvann i svalbardområdet
(Master thesis; Mastergradsoppgave, 2007-06-19)Målet med dette studiet var å analysere grønlandsselens (Pagophilus groenlandicus) beiting om sommeren i svalbardområdet for 2004, 2005 og 2006. Totalt ble 150 grønlandsseler samt 125 fecesprøver innsamlet i to underområder (øst og vest) i det sørlige svalbardområdet i mai-juni 2004-2006. I 2006 ble det gjennomført ressurskartlegging ved bruk av akustikk og tråling, hvor tråldataene ble benyttet til ... -
Grønne konsesjoner. Et spill for galleriet, eller løsningen på havbruksnæringens utfordringer?
(Master thesis; Mastergradsoppgave, 2016-05-18)Norsk oppdrettsnæring opplever i dag et globalt marked som etterspør stadig mer atlantisk laks (Salmo salar L.), men etterspørselen har de siste årene ikke blitt møtt med en tilsvarende økning i produksjonen. I en tid preget av et stort fokus på miljø og bærekraft, har det for oppdrettere og politikere vært vanskelig å snakke om en produksjonsøkning, hovedsakelig grunnet lakseparasitten lakselus ... -
Guidelines for co-creating climate adaptation plans for fisheries and aquaculture
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-27)Climate change is having a significant impact on the biology and ecology of fish stocks and aquaculture species and will affect the productivity within seafood supply chains in the future. The challenges are further amplified when actors within the fisheries and aquaculture sectors have very different ideas and assumptions about climate change and what risks and opportunities they entail. In order ... -
Habitat choice of juvenile coastal cod : the role of macroalgae habitats for juvenile coastal cod (Gadus morhua L.) in Porsangerfjorden and Ullsfjorden in Northern Norway
(Master thesis; Mastergradsoppgave, 2012-11-15)Habitat choice of small juvenile coastal cod (Gadus morhua L. 1758) was investigated in a field study in Porsangerfjorden and Ullsfjorden in Northern Norway. A towed video rig was used to record video along depth transects in the subtidal zone. Depth, algae cover and occurrence of 0- group, 1-group and 2+ group cod was registered. Beach seine and angling was used to estimate relative abundances of ... -
Haematology and clinical blood chemistry in harbour porpoises (Phocoena phocoena) from the inner Danish waters
(Journal article; Tidsskriftartikkel, 2020-07-13)Harbour porpoises (<i>Phocoena phocoena</i>) in the Baltic Sea are under increasing pressure from anthropogenic activities, which affect the overall health of populations. Individuals’ haematologic and biochemistry parameters are known to be linked to a population’s health status and are therefore useful tools for cross-population comparisons and to assess health patterns of a population through ... -
Haemolymfeprotein som indikasjon på muskelmasse hos oppfôrede og villfangede kongekrabber (Paralithodes camtchaticus Tilesius 1815)
(Master thesis; Mastergradsoppgave, 2007-11-12)Haemolymfeprotein som indikasjon på muskelmasse hos oppfôrede og villfangede kongekrabber -
Harvest control rules in modern fisheries management
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-20)Harvest control rules have become an important tool in modern fisheries management, and are increasingly adopted to provide continuity in management practices, to deal with uncertainty and ecosystem considerations, and to relieve management decisions from short-term political pressure. We provide the conceptual and institutional background for harvest control rules, a discussion of the structure of ... -
Harvest production and economic efficiency of Bangladeshi industrial trawlers in the bay of Bengal
(Master thesis; Mastergradsoppgave, 2011-06-09)Since the 1990’s development of industrial trawl fisheries of Bay of Bengal, Bangladesh has attracted due to its high demand and abundance of fish and shrimp resources. This paper investigates Bangladeshi industrial trawl fishery by employing a bioeconomic model and an input-oriented Data Envelopment Analysis. The fundamental objective of this paper is to provide the technique through which long run ... -
Hav, fisk og ressursforvaltning i nordområdene
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-08)Mesteparten av norske havområder ligger nord for polarsirkelen og er åsted for noen av verdens rikeste fiskerier. De største fiskebestandene er delt med andre land, og internasjonalt samarbeid om ressursforvaltningen er derfor en viktig dimensjon ved nordområdepolitikken. Slikt samarbeid er basert på globale normer om hvordan levende marine ressurser skal forvaltes og deles og foregår på en rekke ... -
Havbruksnæringen og koronapandemien
(Master thesis; Mastergradsoppgave, 2022-05-16)Norsk havbruksnæring har siden starten på 1970-tallet hatt en kontinuerlig vekst og utvikling. Norsk atlantisk laks har en stor etterspørsel i det globale markedet. I dag er næringen Norges nest største eksportnæring. Det aller meste som havbruksnæringen produserer blir eksportert ut av landet. Bransjen er derfor avhengig av sine utenlandske kunder. Det store spørsmålet er hvordan havbruksnæringen ... -
Have environmental preferences and willingness to pay remained stable before and during the global Covid-19 shock?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-07)This study tests the stability of environmental preferences and willingness to pay (WTP) values using a discrete choice experiment (DCE) across three countries pre and post the peak of the first wave of the Covid-19 pandemic. A DCE eamining the public’s preferences for alternative environmental management plans on the high seas, in the area of the Flemish Cap, was carried out in Canada, Scotland ... -
Havfarm 3: Governmentally driven innovations in Norwegian aquaculture. A challenge for the governing system?
(Master thesis; Mastergradsoppgave, 2019-05-15)The Norwegian aquaculture industry is today experiencing increasing demands of Atlantic salmon (Salmo salar L.) from global markets. However, past years has not seen the same rise in production as in value. In a time where several area and environmental-related challenges are hindering further growth of the Norwegian aquaculture industry, the development licenses have become the latest licensing ... -
A head start for an invasive species in a strongly seasonal environment? Growth of Elodea canadensis in boreal lakes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-20)Many invasive species are expanding northwards into boreal and subarctic habitats, but research on the factors favoring their establishment in these regions remains limited. In three Swedish lakes we investigated the growth of Elodea canadensis Michx, a highly invasive macrophyte that is spreading northwards in Europe and Alaska. We conducted an in situ growth experiment, maintained for ten months, ... -
Heat treatment increases the protein bioaccessibility in the red seaweed dulse (Palmaria palmata), but not in the brown seaweed winged kelp (Alaria esculenta)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-04-25)Bioaccessibility of plant proteins has been shown to be inferior to that of proteins of animal origin. Heat treatment has been shown to positively affect this in some plants. The aim of this study was to investigate the effect of heat treatment on bioaccessibility of seaweed proteins. An in vitro gastrointestinal digestion model was used for evaluation of potential effects on the brown seaweed Alaria ...
