Now showing items 39-58 of 372

    • Can a large-mesh sieve panel replace or supplement the Nordmøre grid for bycatch mitigation in the northeast Atlantic deep-water shrimp fishery? 

      Jacques, Nadine; Herrmann, Bent; Larsen, Roger B.; Sistiaga, Manu Berrondo; Brčić, Jure; Gökçe, Gökhan; Brinkhof, Jesse (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-26)
      The Nordmøre grid is the principle bycatch mitigation device in many shrimp trawl fisheries. However, in several of these fisheries, bycatch is a problem because small sized fish can pass through the grid and enter the codend together with the targeted shrimp. One such fishery is the Northeast Atlantic deep-water shrimp (<i>Pandalus borealis</i>) fishery, where the use of a Nordmøre grid is mandatory. ...
    • Carbon, Nitrogen and Sulphur isotopic fractionation in captive juvenile hooded seal (Cystophora cristata): application for diet analysis 

      Pinzone, Marianna; Acquarone, Mario; Huyghebaert, Loreen; Sturaro, Nicolas; Michel, Loïc N.; Siebert, Ursula; Das, Krishna (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-15)
      <p><i>Rationale</i>: Intrinsic biogeochemical markers, such as stable isotope ratios of carbon, nitrogen and sulphur, are increasingly used to trace the trophic ecology of marine top predators. However, insufficient knowledge of fractionation processes in tissues continues to hamper the use of these markers.</p> <p><i>Methods</i>: We performed a controlled feeding experiment with eight juvenile ...
    • 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.
    • Catch and release patterns for target and bycatch species in the Northeast Atlantic deep-water shrimp fishery: Effect of using a sieve panel and a Nordmøre grid 

      Larsen, Roger B.; Herrmann, Bent; Sistiaga, Manu Berrondo; Brinkhof, Jesse; Santos, Juan (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-21)
      The Nordmøre grid and the sieve panel are two of the main devices used to reduce fish bycatch in trawl fisheries targeting shrimp species. However, even when using such devices, some small-sized fish enter the codend of the trawl together with the targeted shrimp. Therefore, bycatch reduction remains a problem in some shrimp fisheries. One such fishery is the Northeast Atlantic deep-water shrimp ...
    • Catch Efficiency of Groundgears in a Bottom Trawl Fishery: A Case Study of the Barents Sea Haddock 

      Larsen, Roger B.; Herrmann, Bent; Brinkhof, Jesse; Grimaldo, Eduardo; Sistiaga, Manu Berrondo; Tatone, Ivan (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-10)
      The catch efficiency of two types of groundgear—a conventional rockhopper and a new type of groundgear called the semicircular spreading gear (SCSG)—was investigated through experimental fishing for Haddock Melanogrammus aeglefinus conducted in the Barents Sea. A retainer bag was attached behind the footrope of the trawl, and the number of fish that were overrun by the trawl was compared with the ...
    • Causes and consequences of fleet diversity in fisheries: The case of the Norwegian Barents Sea cod fishery 

      Eide, Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-25)
      Fisheries operate under fluctuating environmental conditions, targeting fish stocks that appear in varying densities in different areas, often with abrupt and unexpected local changes. Physical conditions, markets and management regulations constrain vessels in different and varying ways. These factors all contribute to forming the fleet diversity we find in most fisheries. Here, a simulation model ...
    • Cellular Antioxidant Effect of Four Bromophenols from the Red Algae, Vertebrata lanosa 

      Olsen, Elisabeth Klungerbo; Hansen, Espen; Isaksson, Johan; Andersen, Jeanette hammer (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Three known bromophenols, 2,3-dibromo-4,5-dihydroxybenzylaldehyde (1), 2,2′,3-tribromo-3′,4,4′,5-tetrahydroxy 6′-hydroxymethyldiphenylmethane (2) and bis(2, 3-dibromo-4,5-dihydroxylbenzyl) ether (3), and one new one, 5,5″-oxybis(methylene)bis (3-bromo-4-(2′,3′-dibromo-4′,5′-dihydroxylbenzyl)benzene-1,2-diol) (4), were isolated from an extract of the red alga, Vertebrata lanosa. The antioxidant ...
    • Change in Fish Community Structure in the Barents Sea 

      Aschan, Michaela; Fossheim, Maria; Greenacre, Michael; Primicerio, Raul (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Change in oceanographic conditions causes structural alterations in marine fish communities, but this effect may go undetected as most monitoring programs until recently mainly have focused on oceanography and commercial species rather than on whole ecosystems. In this paper, the objective is to describe the spatial and temporal changes in the Barents Sea fish community in the period 1992–2004 while ...
    • Changes in softbottom macrofauna communities along environmental gradients 

      Aschan, Michaela (Journal article; Tidsskriftartikkel; Peer reviewed, 1990-12-21)
    • Characterization of Rhamnolipids Produced by an Arctic Marine Bacterium from the Pseudomonas fluorescence Group 

      Kristoffersen, Venke; Rämä, Teppo; Isaksson, Johan; Andersen, Jeanette H.; Gerwick, William H.; Hansen, Espen (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-14)
      The marine environment is a rich source of biodiversity, including microorganisms that have proven to be prolific producers of bioactive secondary metabolites. Arctic seas are less explored than warmer, more accessible areas, providing a promising starting point to search for novel bioactive compounds. In the present work, an Arctic marine Pseudomonas sp. belonging to the Pseudomonas (P.) fluorescence ...
    • Characterization of the gut microbiome of hooded seals (Cystophora cristata) 

      Acquarone, Mario; Salgado, Alejandro Flores; Sundset, Monica Alterskjær (Conference object; Konferansebidrag, 2016-03-14)
    • Climate change alters the structure of arctic marine food webs due to poleward shifts of boreal generalists 

      Kortsch, Susanne; Primicerio, Raul; Fossheim, Maria; Dolgov, Andrey V.; Aschan, Michaela (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09-02)
      Climate-driven poleward shifts, leading to changes in species composition and relative abundances, have been recently documented in the Arctic. Among the fastest moving species are boreal generalist fish which are expected to affect arctic marine food web structure and ecosystem functioning substantially. Here, we address structural changes at the food web level induced by poleward shifts via ...
    • 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 ...
    • 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 ...
    • Coincident mass occurrence of gelatinous zooplankton in Northern Norway 

      Knutsen, Tor; Hosia, Aino; Falkenhaug, Tone; Skern-Mauritzen, Rasmus; Wiebe, Peter H.; Larsen, Roger B.; Aglen, Asgeir (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-23)
      In autumn 2015, several sources reported observations of large amounts of gelatinous material in a large north Norwegian fjord system, either caught when trawling for other organisms or fouling fishing gear. The responsible organism was identified as a physonect siphonophore, Nanomia cara, while a ctenophore, Beroe cucumis, and a hydromedusa, Modeeria rotunda, were also registered in high abundances ...
    • Cold seawater induces early sexual developmental stages in the BPG axis of European eel males 

      Rozenfeld, Christoffer; García-Carpintero, Victor; Pérez, Luz; Gallego, Victor; Herranz-Jusdado, Juan Germán; Tveiten, Helge; Johnsen, Helge K.; Fontaine, Romain David; Weltzien, Finn-Arne; Cañizares, Joaquín; Asturiano, Juan F.; Penaranda, David Sanchez (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-22)
      <i>Background</i>: The impossibility of closing the life cycle of the European eel (<i>Anguilla anguilla</i>) in captivity troubles the future of this critically endangered species. In addition, the European eel is a highly valued and demanded resource, thus the successful closing of its life cycle would have a substantial economic and ecological impact. With the aim of obtaining the highest ...
    • Cold-pressed minke whale oil reduces circulating LDL/VLDL-cholesterol, lipid oxidation and atherogenesis in apolipoprotein E-deficient mice fed a Western-type diet for 13 weeks 

      Walquist, Mari; Stormo, Svein Kristian; Østerud, Bjarne; Elvevoll, Edel Oddny; Eilertsen, Karl-Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-04)
      Background<br> Long-chain n3-polyunsaturated fatty acids (LC n3-PUFA) are well known for their anti-inflammatory activity and their impact on cardiovascular disease. Cold-pressed whale oil (CWO) has half the amount of LC n3-PUFA compared to cod liver oil (CLO). Still, there has been observed more pronounced beneficial effects on cardiovascular disease markers from intake of CWO compared to intake ...
    • Combination of a sorting grid and a square mesh panel to optimize size selection in the North-East Arctic cod (Gadus morhua) and redfish (Sebastes spp.) trawl fisheries 

      Sistiaga, Manu Berrondo; Herrmann, Bent; Grimaldo, Eduardo; Larsen, Roger B.; Olsen, Leonore; Brinkhof, Jesse; Tatone, Ivan (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-12-27)
      Sorting grids and square mesh panels are the two most-applied technical devices to supplement codend size- and species-selection in demer- sal trawls. In the Barents Sea gadoid fishery, the compulsory size-selectivity system comprises a mesh section with a sorting grid followed by a diamond mesh codend. We tested the size-selective performance of a new sorting section that comprised a sorting grid ...
    • Comparing size selectivity of traditional and knotless diamond-mesh codends in the Iceland redfish (Sebastes spp.) fishery 

      Cheng, Zhaohai; Einarsson, Haraldur Arnar; Bayse, Shannon; Herrmann, Bent; Winger, Paul (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-30)
      The size selectivity and usability of two diamond mesh codends, a traditional two-panel codend versus an experimental four-panel ultra-cross knotless mesh codend, were compared using the covered codend method in the Iceland redfish (<i>Sebastes norvegicus and S. viviparous</i>) fishery. Results showed that there was no significant difference in size selectivity between the codends at lengths greater ...
    • 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 ...