Blar i Research Programmes på emneord "VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924"

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    • Behavioral responses of herring (Clupea harengus) to 1–2 and 6–7 kHz sonar signals and killer whale feeding sounds 

      Doksæter, Lise; Godø, Olav Rune; Handegard, Nils Olav; Kvadsheim, Petter H.; Lam, Frans-Peter A.; Donovan, Carl; Miller, Patrick J. O. (Journal article; Peer reviewed, 2009-01)
      Military antisubmarine sonars produce intense sounds within the hearing range of most clupeid fish. The behavioral reactions of overwintering herring (Clupea harengus) to sonar signals of two different frequency ranges ...

    • 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. ...

    • The combined impact of plant-derived dietary ingredients and acute stress on the intestinal arachidonic acid cascade in Atlantic salmon (Salmo salar) 

      Oxley, Anthony; Jolly, Cecile; Eide, Torunn; Jordal, Ann-Elise O.; Svardal, Asbjørn Martin; Olsen, Rolf Erik (Journal article; Peer reviewed, 2010-03)
      A study was conducted to assess the effect of substituting high levels of dietary fish oil (FO) and fishmeal (FM) for vegetable oil (VO) and plant protein (PP) on the intestinal arachidonic acid (AA) cascade in the carnivorous ...

    • Estimating tail-beat frequency using split-beam echosounders 

      Handegard, Nils Olav; Pedersen, Geir; Brix, Ole (Journal article; Peer reviewed, 2009-02-04)
      Data from a standard split-beam echosounder are used to estimate tail-beat frequency within a dense herring (Clupea harengus L.) layer. The data were collected by lowering a horizontally projecting 38 kHz split-beam ...

    • Lateral-aspect target strength measurements of in situ herring (Clupea harengus) 

      Pedersen, Geir; Handegard, Nils Olav; Ona, Egil (Journal article; Peer reviewed, 2009-07)
      Surveys of schooling herring with the new multi-beam sonar (Simrad MS70) pose new challenges when converting the echo energy to estimates of biomass. Since the sonar projects horizontally, data and models of lateral-aspect ...

    • Mareano 

      Buhl-Mortensen, Pål; Sunnset, Beate Hoddevik; Thorsnes, Terje; Skyseth, Trond (Havforskningstema;Nr.2-2008, Working paper, 2008)

    • NEA saithe XSA runs with different survey tuning series 

      Mehl, Sigbjørn; Fotland, Åge (Working paper, 2010-02)
      New tuning series from a combined and improved survey gives lower and more stable S. E. Log q residuals than the tuning series presently used. However, the retrospective trend is still poor and the estimates of F and SSB ...

    • Observing the behavioral response of herring exposed to mid-frequency sonar signals. (A) 

      Handegard, Nils Olav; Doksæter, Lise; Godø, Olav Rune; Kvadsheim, Petter H. (Conference object, 2010-03)
      There is general concern on how mid-frequency military sonars might affect aquatic animals. Approaches used to investigate possible effects on Norwegian spring spawning herring (Clupea harengus) are presented. Experiments ...

    • Retrieving the times series of input data for assessment of NEA saithe 

      Fotland, Åge; Mehl, Sigbjørn (Working paper, 2010-04)
      This WD is meant as an explanation to how the times series input files for the assessment of NEA saithe is expanded to age 15+ at the 2010 AFWG. Table 3 and 4 includes age group 2. This age group is not used in the current ...

    • Some information about CPUE in the Norwegian NEA-saithe trawl fishery 

      Fotland, Åge; Huse, Irene; Mehl, Sigbjørn (Working paper, 2010-02)

    • Stereological calibration of the profile method to quickly estimate atresia levels in fish 

      Kjesbu, Olav Sigurd; Fonn, Merete; Gonzáles, Barbara Dunia; Nilsen, Trygve (Journal article; Peer reviewed, 2010-05)
      The (physical) ‘disector method’, a frequently cited stereological technique, has so far received little attention within fish fecundity studies, although it can be used to provide unbiased, assumption-free data on levels ...

    • Thermal niche of Atlantic cod Gadus morhua: limits, tolerance and optima 

      Righton, David; Andersen, Ken Haste; Neat, Francis; Thorsteinsson, Vilhjalmur; Steingrund, P.; Svedäng, Henrik; Michalsen, Kathrine; Hinrichsen, Hans-Harald; Bendall, Victoria; Neuenfeldt, Stefan; Wright, Peter; Jonsson, Patrik; Huse, Geir; Kooij, Jeroen van der; Mosegaard, Henrik; Hüssy, Karin; Metcalfe, Julian D. (Journal article; Peer reviewed, 2010)
      Recent studies in the marine environment have suggested that the limited phenotypic plasticity of cold-adapted species such as Atlantic cod Gadus morhua L. will cause distributions to shift toward the poles in response to ...