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Understanding and predicting size selection in diamond-mesh cod ends for Danish seining: a study based on sea trials and computer simulations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-06-28)
Danish seining is an important fishing method used to harvest demersal species. Knowledge about the size selectivity of different demersal species with this type of fishing gear is therefore of importance for managing the exploitation of marine resources. However, there are only limited data on size selection in cod ends in this fishery. Sea trials were therefore carried out to collect size selectivity ...
The marine biodiscovery pipeline and ocean medicines of tomorrow
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-01-01)
Marine organisms possess the capacity to produce a variety of unique and biologically potent natural products for treating human diseases, many of which are currently commercially available or are in advanced clinical trials. Here we provide a short review on progress in the field and discuss a case study of an EU-funded project, PharmaSea, which aims to discover novel products for the treatment of ...
Temporal changes and between-host variation in the intestinal parasite community of Arctic charr in a subarctic lake
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-16)
The occurrence of trophically transmitted intestinal parasites in Arctic charr was analyzed from data material collected over two decades from Lake Takvatn, northern Norway. The main objectives were to investigate (i) between-year variation in parasite infracommunity composition, (ii) between-host variation in infracommunity composition, and (iii) possible interspecific interaction between parasites. ...
Community structure affects trophic ontogeny in a predatory fish
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-20)
While most studies have focused on the timing and nature of ontogenetic niche shifts, information is scarce about the effects of community structure on trophic ontogeny of top predators. We investigated how community structure affects ontogenetic niche shifts (i.e., relationships between body length, trophic position, and individual dietary specialization) of a predatory fish, brown trout (Salmo ...
Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout - is three-spined stickleback a key species?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-04-25)
Subarctic populations of brown trout (Salmo trutta) are often heavily infected with cestodes of the genus Diphyllobothrium, assumedly because of their piscivorous behavior. This study explores possible associations between availability of fish prey and Diphyllobothrium spp. infections in lacustrine trout populations. Trout in i) allopatry (group T); ii) sympatry with Arctic charr (Salvelinus alpinus) ...
Variation in functional trait composition of benthic invertebrates across depths and seasons in a subarctic lake
(Journal article; Tidsskriftartikkel, 2016-07-01)
Benthic invertebrate communities play a fundamental role in lake ecosystems, and the understanding of how those benthic communities are structured, particularly in terms of the identity and spatiotemporal distribution of their functional traits, is key to our understanding of how lake ecosystems work. In Takvatn, a subarctic lake in northern Norway, we identified the taxonomic and functional identity ...
A simplified method to estimate Diphyllobothrium spp. infection in salmonids
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-10-13)
Some fish parasites constitute severe management
problems as they may cause mortality of their fish
host or are important zoonoses of humans. Parasite
assessments are therefore critical to keep track
of infections. If conventional sampling techniques
can be simplified, parasite assessments might be
easier to obtain, less time-consuming and more
extensive. In this study, we compare the ...
Comparison of individual transferable quota in New Zealand and individual vessel quota in Norway
(Master thesis; Mastergradsoppgave, 2016-11-21)
Since the introduction of licenses and quotas as important management instruments, Norway has established a system of non-transferable IVQs. The “cod-crisis” was a reason for the Nor- wegian Parliament to reject an ITQ system with a high degree of transactions. However, since the late 80s the IVQ regime have forced towards a market-oriented regime for the expansion of the transferability.
The overall ...
Oljevernberedskap som inngangsbillett til nye leteområder i Arktis
(Lecture; Forelesning, 2016-02-13)
Recovery and properties of oil from the copepod Calanus finmarchicus
(Doctoral thesis; Doktorgradsavhandling, 2016-01-29)
The limited amount of fish oils available has led to extensive search for alternative sources of oils rich in health beneficial long-chain polyunsaturated ω-3 fatty acids. The zooplankton Calanus finmarchicus, also known as redfeed, is present in large amounts in the North Atlantic and has lipid-rich stages, which can be harvested. One of the main objectives of this study was to investigate if the ...