Now showing items 861-880 of 1055

    • Seafood from a changing Arctic 

      Troell, Max; Eide, Arne; Isaksen, John Roald; Hermansen, Øystein; Crépin, Anne-Sophie (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-27)
      We review current knowledge about climate change impacts on Arctic seafood production. Large-scale changes in the Arctic marine food web can be expected for the next 40–100 years. Possible future trajectories under climate change for Arctic capture fisheries anticipate the movement of aquatic species into new waters and changed the dynamics of existing species. Negative consequences are ...
    • Riparian plant litter quality increases with latitude 

      Boyero, Luz; Graca, Manuel A S; Tonin, Alan M; Perez, Javier; Swafford, Andrew J; Ferreira, Veronica; Landeira-Dabarca, Andrea; Alexandrou, Markos A; Gessner, Mark O.; McKie, Brendan G.; Albarino, Ricardo J; Barmuta, Leon A; Callisto, Marcos; Chara, Julian; Chauvet, Eric; Dudgeon, David; Encalada, Andrea C; Figueroa, Ricardo; Flecker, Aleksander, S.; Fleituch, Tadeusz; Frainer, André; Goncalves, Jose F; Helson, Julie E; Iwata, Tomoya; Mathooko, Jude; M'Erimba, Charles; Pringle, Catherine; Ramírez, Alonso; Swan, Christopher M; Yule, Catherine M; Pearson, Richard G (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-05)
      Plant litter represents a major basal resource in streams, where its decomposition is partly regulated by litter traits. Litter-trait variation may determine the latitudinal gradient in decomposition in streams, which is mainly microbial in the tropics and detritivore-mediated at high latitudes. However, this hypothesis remains untested, as we lack information on large-scale trait variation for ...
    • Anti-Infective Effect of Adhesive Probiotic Lactobacillus in Fish is Correlated with Their Spatial Distribution in the Intestinal Tissue 

      He, Suxu; Ran, Chao; Qin, Chubin; Li, Shuning; Zhang, Hongling; de Vos, Willem M.; Ringø, Einar; Zhou, Zhigang (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-16)
      In this study, we tested the distribution of 49 Lactobacillus strains in the mucus and mucosa of the intestine tissue of zebrafish. We observed a progressive change in the spatial distribution of Lactobacillus strains, and suggested a division of the strains into three classes: mucus type (>70% in mucus), mucosa type (>70% in mucosa) and hybrid type (others). The hybrid type strains were more efficient ...
    • Predicting the effect of seine rope layout pattern and haul-in procedure on the effectiveness of demersal seine fishing: a computer simulation-based approach 

      Madsen, Nina; Aarsæther, Karl Gunnar; Herrmann, Bent (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-03)
      Demersal Seining is an active fishing method applying two long seine ropes and a seine net. Demersal seining relies on fish responding to the seine rope as it moves during the fishing process. The seine ropes and net are deployed in a specific pattern encircling an area on the seabed. In some variants of demersal seining the haul-in procedure includes a towing phase where the fishing vessel moves ...
    • Marine reserve creation and interactions between fisheries and capture-based aquaculture: A bio-economic model analysis 

      Bui, Bich Xuan; Armstrong, Claire W. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-12)
      The rapid growth of aquaculture affects wild fisheries in several ways. We present a bioeconomic model of the interaction between a commercial wild fishery and capture-based aquaculture that depends on harvest of wild juveniles. We assume that aquaculture reduces the intrinsic growth rate of the wild fish stock due to wild caught juveniles used as seeds, influencing wild stock size and commercial ...
    • The geographic scope of the svalbard treaty and norwegian sovereignty: historic - or evolutionary - interpretation? 

      Ørebech, Peter Th (Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
      The Svalbard Treaty and its claimed ‘extended-reach’ jurisdiction incorporating both the continental shelf and exclusive economic zone (EEZ) – ie a fisheries protection zone (FPZ) – is an international law puzzle. Disputes regarding the Treaty’s jurisdictione ratione terrae results from interpretative differences. My findings are as follows: the Treaty’s concept of ‘full and absolute sovereignty’ ...
    • Climate-driven changes in functional biogeography of Arctic marine fish communities 

      Frainer, André; Primicerio, Raul; Kortsch, Susanne; Aune, Magnus; Dolgov, Andrey V.; Fossheim, Maria; Aschan, Michaela (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-14)
      Climate change triggers poleward shifts in species distribution leading to changes in biogeography. In the marine environment, fish respond quickly to warming, causing community-wide reorganizations, which result in profound changes in ecosystem functioning. Functional biogeography provides a framework to address how ecosystem functioning may be affected by climate change over large spatial ...
    • The effect of semi-pelagic trawling on american plaice (hippoglossoides platessoides) by-catch reduction in the northeast arctic shrimp fishery 

      Sistiaga, Manu Berrondo; Grimaldo, Eduardo; Herrmann, Bent; Larsen, Roger B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
      The present study reports results of a small-scale preliminary experiment to evaluate whether lifting trawl doors and sweeps from the seabed can lead to a reduction of by-catch in the Northeast Arctic shrimp trawl fishery. We carried out a catch comparison and catch ratio analysis between two gear configurations: one with trawl doors and sweeps on the seabed (traditional rigging) and the other with ...
    • Field sampling marine plankton for biodiscovery 

      Ingebrigtsen, Richard Andre; Hansen, Espen; Andersen, Jeanette Hammer; Eilertsen, Hans Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-20)
      Microalgae and plankton can be a rich source of bioactivity. However, induction of secondary metabolite production in lab conditions can be difficult. One simple way of bypassing this issue is to collect biomass in the field and screen for bioactivity. Therefore, bulk net samples from three areas along the coast of northern Norway and Spitsbergen were collected, extracted and fractionated. ...
    • Report from fact-finding mission to Ghana 8-21 August 2015 

      Hersoug, Bjørn; Johnsen, Jahn Petter (Research report; Forskningsrapport, 2015)
      Over the years, 19 students from Ghana have graduated from the International Fisheries Management Programme (IFM) at the Norwegian College of Fishery Science (NCFS) at the University of Tromsø, the Arctic University of Norway. In addition, three other students from Ghana are in their first and second year of the programme now. These students are trained and supervised by professors with broad ...
    • Exploring the user-producer interface of weather and sea ice information for Arctic marine mobilities: a dedicated session at the Ninth International Congress on Arctic Social Sciences (ICASS) 

      Lamers, Machiel; Knol, Maaike; Ljubicic, Gita (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-29)
      At the International Congress on Arctic Social Sciences (ICASS IX) in Umeå, 8–12 June 2017, we organised a session to raise awareness and to involve other Arctic social scientists in the PPP-SERA agenda. The session focused on the user-producer interface of weather and sea ice information for Arctic marine sectors. In particular, we intended to discuss the complexities of actors, ...
    • Transcriptome analysis of plasmid-induced genes sheds light on the role of type I IFN as adjuvant in DNA vaccine against infectious salmon anemia virus 

      Sobhkhez, Mehrdad; Krasnov, Aleksei; Chang, Chia Jung; Robertsen, Børre (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-21)
      A previous study showed that a plasmid expressing IFNa (pIFNa) strongly enhanced protection and antibody production of a DNA vaccine against infectious salmon anemia virus (ISAV) in Atlantic salmon. The vaccine consisted of a plasmid (pHE) expressing the virus hemagglutinin-esterase as an antigen. To increase the understanding of the adjuvant effect of pIFNa, we here compared transcriptome responses ...
    • Antioxidant and Anti-Inflammatory Activities in Extracts from Minke Whale (Balaenoptera acutorostrata) Blubber 

      Walquist, Mari; Stormo, Svein Kristian; Jensen, Ida-Johanne; Østerud, Bjarne; Eilertsen, Karl-Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-08)
      Intake of long-chain omega-3 polyunsaturated fatty acids (LC-n3-PUFA) is commonly recognized to reduce cardiovascular disease (CVD). In previous studies, cold-pressed whale oil (CWO) and cod liver oil (CLO) were given as a dietary supplement to healthy volunteers. Even though CWO contains less than half the amount of LC-n3-PUFA of CLO, CWO supplement resulted in beneficial effects on anti-inflammatory ...
    • Expression of antimicrobial peptides in coelomocytes and embryos of the green sea urchin (Strongylocentrotus droebachiensis) 

      Li, Chun; Blencke, Hans-Matti; Haug, Tor; Jørgensen, Øyvind; Stensvåg, Klara (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-11-12)
      Antimicrobial peptides (AMPs) play a crucial role in innate immunity. We have previously reported the isolation and characterization of the AMPs, strongylocins 1 and 2, and centrocin 1, from coelomocyte extracts of Strongylocentrotus droebachiensis. Here we show that these AMPs were expressed in phagocytes. In addition, transcripts of strongylocin 1 were detected in vibratile cells and/or colorless ...
    • Introduction to the themed issue - Poststructural approaches to fisheries 

      Mather, Charles; Johnsen, Jahn Petter; Sønvisen, Signe Annie; Sridhar, Aarthi; Stephen, Johny (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-15)
      This themed issue of papers for Maritime Studies emerges out of a special session of the MARE 2015 conference held in Amsterdam. The aim of this Introduction is to provide a brief background to poststructural scholarship drawing on examples and cases from research on fisheries. We argue that a poststructural sensibility has made an important impact on scholars interested in fisheries issues even ...
    • Two Isomeric C16 Oxo-Fatty Acids from the Diatom Chaetoceros karianus Show Dual Agonist Activity towards Human Peroxisome Proliferator-Activated Receptors (PPARs) α/γ 

      Moldes-Anaya, Angel; Sæther, Thomas; Uhlig, Silvio; Nebb, Hilde Irene; Larsen, Terje; Eilertsen, Hans Christian; Paulsen, Steinar Martin (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-25)
      The peroxisome proliferator-activated receptors (PPARs) function as ligand-activated transcription factors that convert signals in the form of lipids to physiological responses through the activation of metabolic target genes. Due to their key roles in lipid and carbohydrate metabolism, the PPARs are important drug targets. However, for several of the PPAR drugs currently in use, adverse side effects ...
    • Climate change, fisheries management and fishing aptitude affecting spatial and temporal distributions of the Barents Sea cod fishery 

      Eide, Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-26)
      Climate change is expected to influence spatial and temporal distributions of fish stocks. The aim of this paper is to compare climate change impact on a fishery with other factors impacting the performance of fishing fleets. The fishery in question is the Northeast Arctic cod fishery, a well-documented fishery where data on spatial and temporal distributions are available. A cellular automata ...
    • Effect of lifting the sweeps on bottom trawling catch efficiency on the Northeast arctic cod trawl fishery 

      Sistiaga, Manu Berrondo; Grimaldo, Eduardo; Herrmann, Bent; Larsen, Roger B.; Tatone, Ivan (Research report; Forskningsrapport, 2014)
      Fuel consumption and environmental concerns have led bottom trawlers fishing for cod (Gadus morhua) in the Barents Sea to use semi-pelagic doors. However, this change may affect fish herding and consequently the catch efficiency of the gear. In this study we compared the catch efficiency of two different setups where the sweep length with bottom contact was different. This setup also enabled us to ...
    • Hvordan planlegges kystsonen? Kartlegging av gjeldende planpraksis etter plan- og bygningsloven i sjøområdene 

      Sørdahl, Patrick Berg; Solås, Ann-Magnhild; Kvalvik, Ingrid; Hersoug, Bjørn (Research report; Forskningsrapport, 2017-06)
      Planlegging i kystsonen har de senere år blitt bedre, og det gjøres mye godt planarbeid ute i kommunene. Flere og flere kommuner har vedtatte planer som dekker sjøarealet, antall interessenter som involveres øker, og omfanget og kvaliteten av datagrunnlaget blir stadig bedre. Flere kommuner tar også initiativ til interkommunale samarbeid hvor større sjøarealer planlegges på tvers av kommunegrensene. ...
    • Use of semi-pelagic trawling for reducing bycatch in shrimp trawls. Trials onboard R/V Johan Ruud 02-06 February 2015 

      Sistiaga, Manu Berrondo; Grimaldo, Eduardo; Larsen, Roger B.; Tatone, Ivan; Vollstad, Jørgen; Herrmann, Bent (Research report; Forskningsrapport, 2015)
      The present study evaluates whether lifting the trawl doors and sweeps from the seabed can reduce bycatch in shrimp trawl fisheries. We carried out a catch comparison and catch ratio analysis between two gear setups, one with the trawl doors and sweeps at the seabed (the traditional way) and the other with the doors and sweeps lifted. The study was carried out on American plaice. The results ...