| Observing Atlantic herring by parametric sonar. | |
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MedLine Citation:
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PMID: 19355430 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Atlantic herring (Clupea harengus) has been observed in situ by the Kongsberg TOPAS PS18 parametric sub-bottom profiling sonar, with nearly horizontal transmit and receive transducer arrays mounted flush on the hull of RV G. O. Sars, at N71.4 E16.3. The primary frequencies are in the band 15-21 kHz, with nonlinearly generated difference frequencies in the band 0.5-6 kHz. The beamwidths are 6-10 deg depending on frequency and range, but with exceedingly low sidelobes. The observation of herring in schools and layers was accomplished with the vessel both at rest and sailing at its ordinary survey speed of 10 knots. The observations with the parametric sonar were confirmed by concurrent, synchronized observations with the Simrad EK6038-kHz scientific echo sounder and by trawling with a pelagic net. The herring length varied from 28.0-36.5 cm. Present work suggests that parametric sonar will become a powerful new tool in marine ecosystem studies, enabling the numerical density of schooling and shoaling fish to be determined, and the size of swimbladder-bearing fish to be estimated by detection of swimbladder resonance. [Work partly supported by Norwegian Research Council Grant no. 184705.]. |
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Authors:
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Olav Rune Godo; Kenneth G Foote; Johnny Dybedal; Eirik Tenningen |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 125 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2009 Apr |
Date Detail:
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Created Date: 2009-04-09 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 2719 Citation Subset: IM |
Affiliation:
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Inst. of Marine Res., PO Box 1870, N-5817 Bergen, Norway, olav.rune.godoe@imr.noWoods Hole Oceanograph. Inst., Woods Hole, MA 02543Kongsberg Defence & Aerosp. AS, Stjoerdal, NorwayInst. of Marine Res., Bergen, Norway. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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