Preliminary results from tests using a high-frequency sonar as trawl-sonde
Working paper
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http://hdl.handle.net/11250/104123Utgivelsesdato
1986Metadata
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This report is not to be cited without prior reference to the authorsSammendrag
A high-frequency, short-range sonar is tested for trawl-geometry
measurements on pelagic and bottom trawls. The sonar was
operated on a standard, coaxial trawl sonde cable, and produced
excellent images of the trawl opening and panels. Data showing
non-ideal performance of the pelagic sampling-trawl at several
depths and speeds, together with corrected geometry are presented.
At short range, the position of fish entering the
bottom trawl could be measured.