Blar i Published in cooperation with others på forfatter "Isaksen, Bjørnar"

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    • Codend selectivity of the Danish seine investigated by the trouser trawl method 

      Isaksen, Bjørnar; Larsen, Roger B. (ICES CM Documents;1988/B:28, Working paper, 1988)
      During June 1986 codend selectivity of the Danish seine was measured using both diamond mesh codends and square mesh codends. Comparisons between different codends were made by the trouser trawl method, having two ...

    • Estimates of capelin trawl efficiency by comparing the available fish with the actual catch. 

      Isaksen, Bjørnar (ICES CM Documents;1979/B:23, Working paper, 1979)
      Swept volume trawl efficiency for two different trawls were determined to be 28 and 60%, respectively by comparing the volume densities of capelin determined by echointegrator, with catch size and swept volume of the ...

    • Fangstbasert havbruk - mellomlagringsløsninger for den mindre kystflåten 

      Midling, Kjell Øyvind; Aas, Kåre; Tobiassen, Torbjørn; Akse, Leif; Isaksen, Bjørnar; Løkkeborg, Svein; Humborstad, Odd Børre (Nofima rapportserie, Research report, 2005)
      Prosjektet har evaluert hvilke muligheter den minste kystflåten (< 15 meter) har for å lagre deler av fangsten sin levende (Fangstbasert havbruk). Tre linefartøy og to snurrevadfartøy har deltatt aktivt, men også redskapet ...

    • Further experiments with radial escape section (RES) as fish-shrimp separator in trawl 

      Valdemarsen, John Willy; Isaksen, Bjørnar (ICES CM Documents;1986/B:29, Working paper, 1986)
      A new approach to the bycatch problem when trawling for shrimp was initiated in Norway in 1984 utilizing the difference in swimming behaviour of fish and shrimp. A radial escape section (RES) in the aft belly of the ...

    • Height and spread of the Danish seine 

      Isaksen, Bjørnar; Larsen, Roger B. (ICES CM Documents;1988/B:29, Working paper, 1988)
      Height and spread of trawls is successfully measured by the wireless "Scanmar" system. Several experiments made by fishermen have shown that this system will not work on the Danish seine. A modified version of the ...

    • A new design in transportation and net cage technology for live seafood and aquacultural purposes 

      Midling, Kjell; Aas, K.; Isaksen, Bjørnar; Pettersen, J.; Jørgensen, S.H. (ICES CM documents, Working paper, 1998)

    • Preliminary Tests of a Shrimp-fish Separator Section for Use in Shrimp Trawls 

      West, Charles W.; Valdemarsen, John Willy; Isaksen, Bjørnar (ICES CM Documents;1984/B:12, Working paper, 1984)
      A prototype shrimp-fish separator to be installed between the body and codend of a shrimp trawl was designed and constructed. The separator uses large square meshes to provide an escape path for fish, while funnels ...

    • Recent developments on blue whiting trawls in Norway. 

      Isaksen, Bjørnar; Jensen, Hans; Olsen, Steinar (ICES CM Documents;1979/B:24, Working paper, 1979)
      Two new blue whiting trawls with very large meshes in the front part have been tested with regard to towing resistance, operational qualities and catching efficiency. The results confirm that the large mesh design is quite ...

    • Reduction of fish bycatch in shrimp trawl using a solid separator grid in the aft belly 

      Isaksen, Bjørnar; Valdemarsen, John Willy; Larsen, Roger B. (ICES CM documents;1990/B:47, Working paper, 1990)
      During 1989-90 a new concept to avoid bycatch of fish in shrimp trawl has been developed in Norway. The system consists of an aluminium grid, 0.6 - 1.0 m wide and 1.3 - l.5 m long, with bars spaced 19 mm. The grid is ...

    • Scale damage and survival of cod and haddock escaping from a demersal trawl 

      Soldal, Aud Vold; Isaksen, Bjørnar; Marteinsson, Jon Einar; Engås, Arill (ICES CM Documents;1991/B:44, Working paper, 1991)
      Cod (Gadus morhua L.) and haddock (Melanogrammus aeglefinus L.) escaping through the meshes of a cod-end (135 mm diamond meshes) or through a metal grid sorting device mounted in the foremost part of the cod-end, were ...

    • Selection and survival in the Norwegian shrimp trawl fisheries 

      Isaksen, Bjørnar; Soldal, Aud Vold (PINRO-IMR Symposium, Conference object, 1997)
      Shrimp trawling has aiways been associated with large bycatches. The problems are solely due to the small mesh sizes generally used in shrimp trawl compared to mesh size in trawls used for various groundfish. During the ...

    • Selectivity experiments with square mesh codends in bottom trawl 

      Isaksen, Bjørnar; Valdemarsen, John Willy (ICES CM Documents;1986/B:28, Working paper, 1986)
      During selectivity experiments with square and diamond mesh codends, an evaluation of the covered codend method and a modified trouser trawl method went in favour of the last one. Both twisted knotless- and braided ...

    • Size- and species selection in Danish seine 

      Isaksen, Bjørnar (IMR/PINRO Joint Report Series, Conference object, 2001)
      The Norwegian seine fishery has traditionally been performed in relative shallow water close to the coast, and this as inevitable led to a high proportion of small fish in the catches. A work on size selectivity was therefore ...

    • Size- and species selection in Danish seine 

      Isaksen, Bjørnar (IMR/PINRO Joint Report Series, Conference object, 2001)
      The Norwegian seine fishery has traditionally been performed in relative shallow water close to the coast, and this as inevitable led to a high proportion of small fish in the catches. A work on size selectivity was therefore ...

    • Survival experiments with cod trawls: summer 2000 

      Soldal, Aud Vold; Isaksen, Bjørnar; Gamst, Kjell Arne (IMR/PINRO Joint Report Series, Conference object, 2001)
      Survival trials with gadoid fish sorted out from a demersal trawl by sorting grids and mesh selection, were carried out in August 2000 off the coast of East Finnmark. The experiments offered no evidences that the sorting ...

    • Survival experiments with cod trawls: summer 2000 

      Soldal, Aud Vold; Isaksen, Bjørnar; Gamst, Kjell Arne (IMR/PINRO Joint Report Series, Conference object, 2001)
      Survival trials with gadoid fish sorted out from a demersal trawl by sorting grids and mesh selection, were carried out in August 2000 off the coast of East Finnmark. The experiments offered no evidences that the sorting ...

    • Survival of saithe (Pollachius virens L.) escaping through trawl meshes 

      Jacobsen, Jan Arge; Thomsen, Bjarti; Isaksen, Bjørnar (ICES CM Documents;1992/B:29, Working paper, 1992)
      A pilot study to estimate the survival of saithe escaping from a cod-end with 145 mm diamond meshes was done in April-May 1992 north of the Faroes. Escaped fish were collected in fine meshed net cages (2x2x5m aluminium ...

    • Vertical entrance into a trawl of Barents Sea gadoids as studied with a two level fish trawl 

      Valdemarsen, John Willy; Engås, Arill; Isaksen, Bjørnar (ICES CM Documents;1985/B:46, Working paper, 1985)
      Catch figures of different demersal species(cod, haddock, saithe etc.) in the cod-ends of a two level trawl were examined using variable height of the separating panel (0.5, 0.75, 1.0 and 1.5 m). Cod enters the trawl ...