In-situ determination of target strength of herring and sprat at 38 and 120 kHz

In-situ determination of target strength of herring and sprat at 38 and 120 kHz

Target strength of herring is estimated as 20 log Length -72.6 dB at 38 kHz and for herring (Clupea harengus ) and sprat (Sprattus sprattus ) combined as 20 log Length -73.1 dB at 120 kHz. An indirect in-situ technique based on a single beam transducer is used. Deconvolution for finding the target s...

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Bibliographische Detailangaben
Veröffentlicht in:Dana. Charlottenlund 1985-01, Vol.5, p.45-54
Hauptverfasser: Degnbol, P, Lassen, H, Staehr, K-J
Format: Artikel
Sprache:eng
Schlagworte:
Clupea harengus
Marine
Sprattus sprattus
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Beschreibung
Zusammenfassung:Target strength of herring is estimated as 20 log Length -72.6 dB at 38 kHz and for herring (Clupea harengus ) and sprat (Sprattus sprattus ) combined as 20 log Length -73.1 dB at 120 kHz. An indirect in-situ technique based on a single beam transducer is used. Deconvolution for finding the target strength distribution is done through a least square fit to the observed echolevel distribution. The herring/sprat peak is identified using cross-correlation between the target strength distribution and the logarithmic length composition.
ISSN:0106-553X