• Oil production structures in the North Sea as fish aggregating devices 

      Brønstad, Oddvar; Humborstad, Odd-Børre; Jørgensen, Terje; Løkkeborg, Svein; Svellingen, Ingvald; Soldal, Aud Vold (ICES CM documents, Working paper, 1998)
      The paper deals with a study aimed at investigating whether underwater structures from decommissioned oil platforms in the North Sea can be used as artificial fish reefs or protection habitats for fish. The experimental ...
    • Quantifying the amount of fish unavailable to a bottom trawl by use of an upward looking transducer 

      Michalsen, Kathrine; Aglen, Asgeir; Somerton, David; Svellingen, Ingvald; Øvredal, Jan Tore (ICES CM documents, Working paper, 1999)
      When surveying demersal fish with a wide and variable vertical distribution, it is desirable to combine information from a bottom trawl survey with the information from a hydroacoustic survey into an absolute abundance ...
    • Simple calibration of a split-beam echo-sounder 

      Svellingen, Ingvald; MacLennan, David N. (ICES CM Documents;1986/B:8, Working paper, 1986)
    • Some pitfalls of short-range standard-target calibration 

      Ona, Egil; Foote, Kenneth G.; Zhao, Xianyong; Svellingen, Ingvald (ICES CM Documents;1996/B:36, Working paper, 1996)
      Often it is necessary or desirable to perform a standard-target calibration at rather short range, for example, because of shallow water or interest in measuring animals at short range. A number of general range-dependent ...