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Browsing Havforskningsinstituttet by Subject "fangstpotensiale"

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Now showing items 1-15 of 15

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    • Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic 

      Heino, Mikko; Porteiro, Filipe M.; Sutton, Tracey T.; Falkenhaug, Tone; Godø, Olav Rune; Piatkowski, Uwe (Journal article; Peer reviewed, 2010-06-29)
      Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. ...
    • Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic 

      Heino, Mikko; Porteiro, Filipe M.; Sutton, Tracey T.; Falkenhaug, Tone; Godø, Olav Rune; Piatkowski, Uwe (Journal article; Peer reviewed, 2010-06-29)
      Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. ...
    • Density dependent catchability in bottom trawl surveys 

      Aglen, Asgeir; Engås, Arill; Godø, Olav Rune; McCallum, Barry R.; Stansbury, Don; Walsh, Stephen J. (ICES CM Documents;1997/W:16, Working paper, 1997)
      Fish form schools, layer or patches in which the individual fish's behaviour is not independent of its neighbours movements. On the other hand, at low densities fish may have the freedom to act as single individuals ...
    • Diurnal variation in bottom trawl survey catches: does it pay to adjust? 

      Hjellvik, Vidar; Godø, Olav Rune; Tjøstheim, Dag (ICES CM Documents;2001/Q:11, Working paper, 2001)
      We have studied the diurnal bias of bottom trawl survey catches with the purpose of adjusting for it and thereby improving the accuracy of abundance estimates. The correction term is estimated with uncertainty, and thus ...
    • Etterlatte oljeplattformer som kunstige fiskerev 

      Soldal, Aud Vold; Humborstad, Odd-Børre; Løkkeborg, Svein; Svellingen, Ingvald; Jørgensen, Terje (Fisken og havet, Research report, 1999)
      Prosjektet som beskrives i rapporten har til hensikt å belyse i hvilken utstrekning etterlatte plattformer i Nordsjøen samler fisk, og om de kan utnyttes til lønnsomt fiske. Hoveddelen ble utført ved Albuskjell 2/4 Fox ...
    • Fitting observed fish trajectories to cathcability models 

      Handegard, Nils Olav (Conference object, 2010-09-08)
    • Incorporating experimentally derived estimates of survey trawl catchability into the stock assessment process 

      Somerton, David; Ianelli, Jim; Walsh, Stephen J.; Smith, Stephen; Godø, Olav Rune; Ramm, David (ICES CM Documents;1997/W:5, Working paper, 1997)
      During the course of the April, 1996, meeting of the Fishing Technology and Fish Behavior Working Group it became clear to many that the methodology for experimentally estimating the catchability of survey trawls might ...
    • Leppefisk - tilgjengelighet og fangstmuligheter i perioden februar - juni. 

      Skog, Kjetil; Mikkelsen, Kent Olav; Bjordal, Åsmund (Fisken og havet, Research report, 1994)
      Anvendelse av leppefisk til biologisk avlusing av oppdrettslaks har vært sterkt økende de siste fem åra. 1 1992 ble det brukt nærmere 300.000 leppefisk til dette formålet, alt basert på fangst fra naturlige bestander. ...
    • Measuring the effect of changes in catchability on the variance of marine survey abundance indices 

      Pennington, Michael; Godø, Olav Rune (ICES CM Documents;1992/D:9, Working paper, 1992)
      The average catch per tow by a research vessel survey is often used as an index of abundance. An estimate of the variance of such indices that is based only on the between station variability in catch may underestimate ...
    • Natural fish behaviour and catchability of groundfish 

      Godø, Olav Rune (ICES CM Documents;1994/G:14, Working paper, 1994)
      Imprecision in estimates of abundance and population parameters obtained from trawl surveys could be reduced if the sources of variability were understood and properly described. Fish behaviour in relation to sampling ...
    • Observations on capelin (Mallotus villosus) in Newfoundland waters 

      Dragesund, Olav; Monstad, Terje (ICES CM Documents;1972/H:12, Working paper, 1972)
    • Rapport om forsøksfisket etter lodde i Barentshavet august-september 1962 

      Olsen, Steinar (Fisken og havet;1963 - Nr. 1, Journal article, 1963)
      The fishing experiments for capelin in August-September of 1962 are described and compared to the results from similar cruises in 1960 and 1961. The conclusion drawn is that a profitable high sea fishery for capelin in the ...
    • Report of the North Sea roundfish working group [Charlottenlund, 21 - 25 March 1977] 

      ICES (ICES CM Documents;1977/F:8, Working paper, 1977)
    • Studying the relationship between spatial fish distributions and trawl catches 

      Trenkel, Verena M.; Godø, Olav Rune; Handegard, Nils Olav; Patel, Ruben (ICES CM Documents;2004/R:26, Working paper, 2004)
      We propose an approach for studying the relationship between spatial fish distributions and the distribution of numbers in trawl catches. Individual spatial fish distributions are derived from acoustics data collected with ...
    • Vertical distribution of cod, haddock and redfish; Impact on bottom trawl and acoustic surveys in the Barents Sea 

      Aglen, Asgeir; Engås, Arill; Huse, Ingvar; Michalsen, Kathrine; Stensholt, Boonchai K. (ICES CM Documents;1997/Y:16, Working paper, 1997)
      At a selected location in the Barents Sea acoustic observations, bottom- and pelagic trawl catch data were collected over a 10 day period. A large proportion of the fish were in the acoustic dead zone during the sampling ...

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