Blar i The Ecosystems and Population Dynamics Programme på forfatter "Pedersen, Geir"
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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 ...