Nye registreringer

  • Data on European seafood biomass production by country, sectors, and species in 2004–2014 and on ecological characteristics of the main species produced 

    Blanchet, Marie-Anne; Primicerio, Raul; Smalås, Aslak; Arias-Hansen, Juliana; Aschan, Michaela (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-30)
    In this data article, we present the 2004–2014 average European seafood production volume by production sector, country, and species. The production data originates from the Food and Agriculture Organisation of the United Nations (FAO) and covers three production sectors: Marine fisheries, marine aquaculture, and freshwater production. We present the main ecological characteristics of each species ...
  • Effects of inconsistent reporting, regulation changes and market demand on abundance indices of sharks caught by pelagic longliners off southern Africa 

    Jordaan, Gareth L.; Santos, Jorge; Groeneveld, Johan C. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-24)
    The assumption of a proportional relationship between catch-per-unit-effort (CPUE) and the abundance of sharks caught by pelagic longliners is tenuous when based on fisher logbooks that report only retained specimens. Nevertheless, commercial logbooks and landings statistics are often the only data available for stock status assessments. Logbook data collected from local and foreign pelagic longline ...
  • Feeding ecology of piscivorous brown trout (Salmo trutta L.) in a subarctic watercourse 

    Jensen, Hallvard; Bøhn, Thomas; Amundsen, Per-Arne; Aspholm, Paul Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2004-02)
    Feeding ecology of piscivorous brown trout was studied in the Pasvik watercourse, Norway and Russia. The watercourse is heavily regulated for hydroelectric purposes, and 5000 brown trout > 25 cm are stocked annually to compensate the negative impacts of the impoundments. Stocked and wild trout had almost identical diets consisting mainly of vendace Coregonus albula and partly of whitefish Coregonus ...
  • Maximum Yield Fishing and Optimal Fleet Composition. A Stage Structured Model Analysis With an Example From the Norwegian North-East Arctic Cod Fishery 

    Helgesen, Irmelin Slettemoen; Skonhoft, Anders; Eide, Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-01)
    A stage structured fishery model with three stages; recruits, immature fish and mature fish is formulated and utilized to analyse maximum sustainable yield (MSY) and optimal harvesting composition in a fishery with two heterogeneous fleets. The stage structured model developed bundles the age classes found in age structured models into stage classes based on their level of maturity, but also the ...
  • Spatio-temporal patterns of genetic variation in Arbacia lixula, a thermophilous sea urchin in expansion in the Mediterranean 

    Pérez-Portela, Rocío; Wangensteen Fuentes, Owen Simon; García-Cisneros, Alex; Valero-Jiménez, Claudio; Palacín, Creu; Turon, Xavier (Journal article; Tidsskriftartikkel; Preprint; Manuskript, 2018-06-14)
    The genetic structure of 13 populations of the amphiatlantic sea urchin <i>Arbacia lixula</i>, as well as temporal genetic changes in three of these localities, were assessed using ten hypervariable microsatellite loci. This thermophilous sea urchin is an important engineer species triggering the formation of barren grounds through its grazing activity. Its abundance seems to be increasing in most ...
  • From PhD to job market: Transforming doctoral training with the SAF21 model 

    Borit, Melania; Weber, Charlotte Teresa; Risan Johnsen, Hanne (Journal article; Tidsskriftartikkel, 2017-03)
  • Under the canopy: Community-wide effects of invasive algae in Marine Protected Areas revealed by metabarcoding 

    Wangensteen Fuentes, Owen Simon; Cebrian, Emma; Palacín, Creu; Turon, Xavier (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-21)
    We analysed with multigene (18S and COI) metabarcoding the effects of the proliferation of invasive seaweeds on rocky littoral communities in two Spanish Marine Protected Areas. The invasive algae studied were <i>Caulerpa cylindracea</i>, <i>Lophocladia lallemandii</i> and <i>Asparagopsis armata</i>. They are canopy-forming, landscape-dominant seaweeds, and we were interested in their effects on the ...
  • Modelling gear and fishers size selection for escapees, discards, and landings: a case study in Mediterranean trawl fisheries 

    Mytilineou, Chryssi; Herrmann, Bent; Mantopoulou-Palouka, Danai; Sala, Antonello; Megalofonou, Persefoni (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-19)
    Gear selectivity and discards are important issues related to fisheries management but separately modelled. This work examines for the first time the overall size-selection pattern on the total amount of individuals of a species entering the trawl codend. An innovative approach was used based on modelling the escapement through the codend in the sea and the subsequently selection process by the ...
  • Bycatch reduction in the Norwegian deep-water shrimp (Pandalus borealis) fishery with a double grid selection system 

    Larsen, Roger B.; Herrmann, Bent; Sistiaga, Manu Berrondo; Brinkhof, Jesse; Grimaldo, Eduardo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-25)
    Trawlers targeting Deep-water Shrimp (<i>Pandalus borealis</i>) in the North Atlantic use a Nordmøre sorting grid ahead of a small-meshed codend. Based on experimental fishing, the effect of adding a 9 mm spaced release grid behind the mandatory 19 mm spaced Nordmøre sorting grid, was determined. The performance in terms of size selection of the release grid and the two grids combined were assessed ...
  • Assessing the impact of buffer towing on the quality of Northeast Atlantic cod (Gadus morhua) caught with a bottom trawl 

    Brinkhof, Jesse; Larsen, Roger B.; Herrmann, Bent; Olsen, Stein Harris (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-28)
    The dense aggregations of Northeast Atlantic cod (Gadus morhua) in the Barents Sea have led to a new fishing practice termed “buffer towing.” In this fishery, many trawlers redeploy the trawl directly after taking the catch onboard in an attempt to secure a continuous supply of fish and avoid any unnecessary stops during processing. If the approximate desired amount of fish is caught or exceeded ...
  • Size selection of Nephrops norvegicus (L.) in commercial creel fishery in the Mediterranean Sea 

    Brčić, Jure; Herrmann, Bent; Mašanović, Marina; Baranović, Mateja; Šifner, Svjetlana Krstulović; Škeljo, Frane (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-12-23)
    In the Mediterranean Sea <i>Nephrops</i> (<i>Nephrops norvegicus</i>) is predominantly caught with bottom trawls, but it is also harvested with creels. While the size selection of <i>Nephrops</i> in bottom trawls is well documented, there is no previous information on creel size selection for this species. Therefore, sea trials were carried out to assess the selective properties of commercial creels ...
  • Comparison of fishing efficiency between biodegradable PBSAT gillnets and conventional nylon (PA) gillnets 

    Grimaldo, Eduardo; Herrmann, Bent; Su, Biao; Føre, Heidi Moe; Vollstad, Jørgen; Olsen, Leonore; Larsen, Roger B.; Tatone, Ivan (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-19)
    Gillnets made of a new biodegradable resin (polybutylene succinate co-adipate-co-terephthalate (PBSAT) were tested under commercial fishing conditions to compare their fishing performance with that of conventional nylon (PA) nets. The relative catch efficiency between the two gillnet 15 types was evaluated over the entire winter fishing season for cod (<i>Gadus morhua</i>) in northern Norway. The ...
  • Size selectivity and length-dependent escape behaviour of haddock in a sorting device combining a grid and a square mesh panel 

    Herrmann, Bent; Sistiaga, Manu Berrondo; Grimaldo, Eduardo; Larsen, Roger B.; Olsen, Leonore; Brinkhof, Jesse; Tatone, Ivan (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-04)
    Size selectivity of a new sorting section combining a sorting grid and a square mesh panel was tested for haddock (Melanogrammus aeglefinus) in the Barents Sea demersal trawl fishery. Sampling data for a wide size range enabled investigating the selection process for this species in detail, both for the grid and the square mesh panel. Contrary to earlier studies modelling size selectivity for grids ...
  • A case of vertebral coalescence and lateral line deformity in Hypophthalamichthys nobilis (Richardson, 1844) obtained from aquaculture activity in Iran 

    Jawad, Laith A.; Kousha, Armin (Journal article; Tidsskriftartikkel, 2011-10-31)
    Vertebral coalescence and malformation in the lateral line are reported in a specimen of cultured cyprinid fish <i>Hypophthalamichthys nobilis </i>. Severe vertebral fusion was observed and described. Lateral line showed unusual undulation in the trunk region. Genetic and epigenetic causes may be implicated in these anomalies.
  • Hundreds of species observations and four ascomycetes new to Norway during a mycology field course 

    Rämä, Teppo (Journal article; Tidsskriftartikkel; Peer reviewed, 2018)
    During a mycology field course in Drøbak 29th August – 2nd September 2011 several interesting and some new taxa to Norway were found. Species not previously recorded in Norway include <i>Tatraea dumbirensis, Corollospora maritima, Nectriopsis candicans</i> and <i>Ombrophila juniperinella</i>. A list of 413 taxa, including records of three threatened species, is given and the ecology and distribution ...
  • Fishing efficiency of biodegradable PBSAT gillnets and conventional nylon gillnets used in Norwegian cod (Gadus morhua) and saithe (Pollachius virens) fisheries 

    Grimaldo, Eduardo; Herrmann, Bent; Vollstad, Jørgen; Su, Biao; Føre, Heidi Moe; Larsen, Roger B.; Tatone, Ivan (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-10)
    Fishing trials were carried out to compare the relative fishing efficiency of gillnets made of a new biodegradable resin (polybutylene succinate co-adipate-co-terephthalate, PBSAT) with conventional (nylon) nets. The fishing trials covered two consecutive fishing seasons (2016 and 2017) for cod (<i>Gadus morhua</i>) and saithe (<i>Pollachius virens</i>) in northern Norway. Results generally showed ...
  • Policy context as a factor of bias in the valuation of environmental goods – a dual-process theories perspective 

    Nikitina, Ekaterina (Journal article; Tidsskriftartikkel; Preprint; Manuskript, 2018-03-13)
    When ecosystem services value estimates are applied in the economic assessment of environmental policies, high accuracy of these estimates is required. One of the directions in the scientific discussion on biases in stated preference (SP) valuation surveys builds on dual-process theories of judgment. The paper contributes to this literature by presenting an experiment where two types of judgment ...
  • Opportunity Cost of Environmental Conservation in the Presence of Externalities: Application to the Farmed and Wild Salmon Trade-Off in Norway 

    Nikitina, Ekaterina (Journal article; Tidsskriftartikkel; Preprint; Manuskript, 2018-08-17)
    Estimation of the opportunity cost is necessary for the economic assessment of environmental conservation policies. This paper considers the case where an environmental good is negatively affected in the process of the production of marketable goods. In the presence of externalities, conservation implies the undertaking of abatement measures by polluters. A relevant measure of opportunity cost in ...
  • The demands they are a-changin' 

    Brækkan, Eivind Hestvik; Thyholdt, Sverre Braathen; Asche, Frank; Myrland, Øystein (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-15)
    Smooth operators such as time trends are often applied to deal with unidentified demand shifters. However, if unknown factors affect demand irregularly, a time trend fails to capture the variation. We present an index approach for estimating irregular demand shifts, decomposing total demand shifts into predicted and unexplained effects. This allows separating demand shifts caused by known factors ...
  • Paralithocins, Antimicrobial Peptides with Unusual Disulfide Connectivity from the Red King Crab, Paralithodes camtschaticus 

    Moe, Morten Kaare; Haug, Tor; Sydnes, Magne Olav; Sperstad, Sigmund; Li, Chun; Vaagsfjord, Lena Christine; de la Vega, Enrique; Stensvåg, Klara (Journal article; Tidsskriftartikkel; Preprint; Manuskript, 2018-01-17)
    As part of an ongoing exploration of marine invertebrates as a source of new antimicrobial peptides, hemocyte extracts from the red king crab, <i>Paralithodes camtschaticus</i>, were studied. Three cationic cysteine (Cys)-rich peptides, named paralithocins 1–3, were isolated by bioassay-guided purification, and their amino acid sequences determined by Edman degradation and expressed sequences tag ...

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