Blar i forfatter Artikler, rapporter og annet (arktisk og marin biologi) "Aas-Hansen, Øyvind"

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    • Effects of exhaustive swimming and subsequent recuperation on flesh quality in unstressed Atlantic cod (Gadus morhua) 

      Svalheim, Ragnhild Aven; Karlsson-Drangsholt, Anders; Olsen, Stein Harris; Johnsen, Helge K.; Aas-Hansen, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-25)
      Wild Atlantic cod of commercial size (1.9 ± 0.5 kg) were swum to exhaustion in a large swim tunnel in an attempt to mimic the initial stage of trawling, when fish swim at the trawl mouth until they fatigue or lose interest and subsequently drop into the trawl. The objective of the study was to investigate if exhaustive swimming in unstressed cod had any negative effects on fillet quality, and if ...

    • Evoked potentials in the Atlantic cod following putatively innocuous and putatively noxious electrical stimulation: a minimally invasive approach 

      Ludvigsen, Stian; Stenklev, Niels Chr.; Johnsen, Helge K.; Laukli, Einar; Matre, Dagfinn; Aas-Hansen, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Aspects of peripheral and central nociception have previously been studied through recording of somatosensory evoked potentials (SEPs) to putative noxious stimuli in specific brain regions in a few freshwater fish species. In the present study, we describe a novel, minimally invasive method for recording SEPs from the central nervous system of the Atlantic cod (Gadus morhua). Cutaneous ...

    • Simulated trawling: Exhaustive swimming followed by extreme crowding as contributing reasons to variable fillet quality in trawl-caught Atlantic cod (Gadus morhua) 

      Svalheim, Ragnhild Aven; Aas-Hansen, Øyvind; Heia, Karsten; Karlsson-Drangsholt, Anders; Olsen, Stein Harris; Johnsen, Helge K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-18)
      Trawl-caught Atlantic cod (Gadus morhua) often yield highly variable fillet quality that may be related to capture stress. To investigate mechanisms involved in causing variable quality, commercial-sized (3.5±0.9 kg) Atlantic cod were swum to exhaustion in a large swim tunnel and subsequently exposed to extreme crowding (736±50 kg m<sup>-3</sup>) for 0, 1 or 3 hours in an experimental cod-end. The ...