Fakultet for biovitenskap, fiskeri og økonomi: Nye registreringer
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The distribution of Eubothrium crassum (Cestoda: Pseudophyllidea) in brown trout, Salmo trutta, in allopatric and sympatric populations
(Master thesis; Mastergradsoppgave, 2021-05-17)Sticklebacks in particular have been suspected to have a role in transmission of E. crassum to its final host, the brown trout. In this study, prevalence and mean abundance of E. crassum in trout have been examined in allopatric and sympatric populations to address the suspected role of sticklebacks in the life cycle of E. crassum. 1106 trout from 22 lakes in the northern parts of Norway were ... -
Ordningen med utviklingstillatelser Et bidrag til innovasjon i norsk oppdrettsnæring
(Master thesis; Mastergradsoppgave, 2017-05-15)Norsk oppdrettsnæring har opplevd eventyrlig vekst. I løpet av en et halvt århundre har næringen utviklet seg fra omtrent ingenting til å bli blant våre viktigste og største eksportnæringer. Veksten har i stor grad skyltes oppdretternes kontinuerlige produktivitetsforbedringer, basert på forbedring av utstyr, avl og utvikling av vaksiner og fôr. Skal eventyret få fortsette er næringen avhengig av å ... -
Robuste sjømatinntekter også under COVID-19 pandemien
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-09)Norge er verdens nest største eksportør av sjømat. Inntektene skaper arbeid og aktivitet i lokalsamfunn langs hele kysten. Denne studien undersøker hvor sårbare inntektene til sjømatnæringen har vært under Covid-19 pandemien som har preget mesteparten av 2020 og hele 2021. I tillegg til å analysere inntektsutviklingen på aggregert nivå for fiskeri og havbruk, presenterer studien sektorvise analyser ... -
Vi trenger flere sjømat-influensere!
(Chronicle; Kronikk, 2022-04-29)Til tross for at folk er blitt mer opptatt av å ha et sunt kosthold, har sjømatkonsumet vært dalende i flere år – spesielt blant den unge befolkningen. Kan sosiale medier og influensere være løsningen på problemet? -
The future of Arctic sea-ice biogeochemistry and ice-associated ecosystems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-27)The Arctic sea-ice-scape is rapidly transforming. Increasing light penetration will initiate earlier seasonal primary production. This earlier growing season may be accompanied by an increase in ice algae and phytoplankton biomass, augmenting the emission of dimethylsulfide and capture of carbon dioxide. Secondary production may also increase on the shelves, although the loss of sea ice exacerbates ... -
Antimikrobielle forbindelser i kongsnegl (Buccinum undatum) og neptunsnegl (Neptunea despecta)
(Master thesis; Mastergradsoppgave, 2017-05-15)Det økende antall patogene bakteriestammer som utvikler resistens mot dagens kommersielle antibiotika er en av de største truslene mot den globale helsen i vår tid. Infeksjonssykdommer som tidligere kunne behandles med antibiotika har nå nesten blitt umulige å behandle, det er derfor et umiddelbart behov for nye typer antibiotika med nye virkningsmekanismer enn det som allerede eksisterer på markedet. ... -
Securidine analogues from the marine bryozoan Securiflustra securifrons.
(Master thesis; Mastergradsoppgave, 2021-05-12)Har isolert analoger av Securidine A, samt andre forbindelser fra arten Securiflustra securifrons, utført strukturoppklaring og testet for bioaktivitet. -
First documentation of plastic ingestion in the arctic glaucous gull (Larus hyperboreus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-20)Arctic wildlife is facing multiple stressors, including increasing plastic pollution. Seabirds are intrinsic to marine ecosystems, but most seabird populations are declining. We lack knowledge on plastic ingestion in many arctic seabird species, and there is an urgent need for more information to enable risk assessment and monitoring. Our study aimed to investigate the occurrence of plastics in ... -
Oceanic plastic pollution caused by Danish seine fishing in Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-06)Wear and tear on fishing gear is a sparsely investigated source of microplastic pollution in the sea. In Norway, Danish seine ropes and trawls are the fishing gears that contribute most to this pollution. The main reason for this pollution is that the seine ropes are dragged along the seabed over a considerable distance, creating a friction force that results in high ropes wear. This note reports ... -
Arctic marine fishes and their fisheries in light of global change
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013-09-17)In light of ocean warming and loss of Arctic sea ice, harvested marine fishes of boreal origin (and their fisheries) move poleward into yet unexploited parts of the Arctic seas. Industrial fisheries, already in place on many Arctic shelves, will radically affect the local fish species as they turn up as unprecedented bycatch. Arctic marine fishes are indispensable to ecosystem structuring and ... -
Ultrastructural evidence for the participation of muscle cells in the formation of extracellular matrices in aporocotylid blood flukes (Digenea)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-05)The muscle cells and extracellular matrices (ECMs) of two teleost-infecting blood flukes belonging to distinct evolutionary lineages of the Aporocotylidae (Digenea) were examined using Transmission Electron Microscopy. Four morphotypes of muscle cells were found in the freshwater species Sanguinicola sp., but were considered to be various developmental stages of a single cisternic type. In the marine ... -
Assessment of the risks to honey bees and biodiversity in Norway posed by the predatory wasp species Vespa velutina and V. mandarinia - Scientific Opinion of the Panel on Alien Organisms and Trade in Endangered species of the Norwegian Scientific Committee for Food and Enviroment
(Research report; Forskningsrapport, 2022-02-21)Med varmere klima er det mulig at asiatisk geithams (Vespa velutina) kan spre seg til Norge. Det er usannsynlig at japansk geithams (Vespa mandarina) vil spre seg til Norge. -
Economic valuation of climate change impacts on ecotourism in Rekawa coastal wetland in Sri Lanka: Application of stated preference techniques
(Doctoral thesis; Doktorgradsavhandling, 2022-06-02)<p>The research presented in this thesis has focused on the economic valuation of climate change impacts on ecotourism in a coastal wetland using three different methods of stated-preference techniques to provide answers to different research questions related to coastal tourism and climate change. Rekawa coastal wetland in Southern Sri Lanka was taken as the empirical context to examine the identified ... -
Niches of marine mammals in the European Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-11)The Arctic is warming rapidly, with concomitant sea ice losses and ecosystem changes. The animals most vulnerable to Arctic food web changes are long-lived and slow-growing such as marine mammals, which may not be able to adapt rapidly enough to respond to changes in their resource bases. To determine the current extent and sources of these resource bases, we examined isotopic and trophic niches ... -
Intra-season variations in distribution and abundance of humpback whales in the West Antarctic Peninsula using cruise vessels as opportunistic platforms
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-09)Fine-scale knowledge of spatiotemporal dynamics in cetacean distribution and abundance throughout the Western Antarctic Peninsula (WAP) is sparse yet essential for effective ecosystem-based management (EBM). Cruise vessels were used as platforms of opportunity to collect data on the distribution and abundance of humpback whales (Megaptera novaeangliae) during the austral summer of 2019/2020 in a ... -
Dietary effects on biomarkers of growth, stress, and welfare of diploid and triploid Atlantic salmon (Salmo salar) during parr-smolt transformation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-12)Triploidy is induced in Atlantic salmon (Salmo salar) to produce sterile fish for genetic containment and to hinder early sexual maturation in farmed fish, but it can have unwanted negative effects on growth, health, and welfare. However, the growth and welfare of triploid fish may be improved by adjusting the rearing environment, feeding conditions and diets. This study evaluated physiological ... -
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 ... -
Driving through dense fog: a study of the effects and control of sustainable public procurement of electric cars
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-21)Governments are large buyers of vehicles, thus contributing to pollution. To promote sustainability, policies have been shaped to replace government-owned fossil fuel cars with electric cars. Public procurement is seen as a strategic tool for the government to transition. This study identifies a research gap due to a lack of studies on how stakeholders at different levels identify and calculate the ... -
Overview of the MOSAiC expedition: Snow and sea ice
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-07)Year-round observations of the physical snow and ice properties and processes that govern the ice pack evolution and its interaction with the atmosphere and the ocean were conducted during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition of the research vessel Polarstern in the Arctic Ocean from October 2019 to September 2020. This work was embedded ... -
Disrupted seasonal biology impacts health, food security and ecosystems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-22)The rhythm of life on earth is shaped by seasonal changes in the environment. Plants and animals show profound annual cycles in physiology, health, morphology, behaviour and demography in response to environmental cues. Seasonal biology impacts ecosystems and agriculture, with consequences for humans and biodiversity. Human populations show robust annual rhythms in health and well-being, and the ...