Blar i Lectures på forfatter "Ona, Egil"
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Fish reaction to trawling noise: The significance for trawl sampling
Ona, Egil; Godø, Olav Rune (Conference object, 1990)The reactions of fish during trawling were observed with a stationary echo sounder as a trawling vessel passed close to the transducer. Several strong, downward avoidance reactions of haddock (Melanogrammus aeglefinus ) ... -
Target tracking with a split-beam echo sounder
Brede, Raymond; Kristensen, Finn Hogne; Solli, Haakon; Ona, Egil (Conference object, 1990)The split-beam technique makes it possible to determine the precise location of a fish in the acoustic beam. This is a very useful feature, as it permits behavioural observations to be conducted without disturbing the fish. ...