Measurement of fish target strength with a split‐beam echo sounder Foote, Kenneth G. Aglen, Asgeir Nakken, Odd 2014-05-01T17:16:42Z 2014-05-01T17:16:42Z 1986-08
dc.description Author Posting. © Acoustical Society of America, 1986. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 80 (1986): 612-621, doi:10.1121/1.394056. en_US
dc.description.abstract Data derived with a 38‐kHz split‐beam echo sounder have been analyzed to yield target strengths suitable for use with echo integrators. This has required compensation for both thresholding and saturation, since these operations can significantly bias data intended for use with systems, such as echo integrators, whose dynamic ranges are much larger. A nonparametric statistical method is introduced for this purpose. Pure‐species acoustic data are extracted in several two‐species cases by a method for separating superimposed frequency distributions. Mean i n s i t u target strengths are presented for cod, saithe, Norway pout, herring, redfish, and greater silver smelt. For com‐ parison with other data, these are expressed through the standard equation ∼(TS) =20 log l +b, where ∼(TS) is the mean target strength in decibels, and l is the fish length in centimeters. For gadoids of lengths from 10 to over 105 cm, b=−67.5 dB. For herring of lengths from 24 to 34 cm, b=−72.1 dB. The often‐ignored problem of obtaining unambiguous biological data by trawl sampling is discussed. en_US
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dc.identifier.citation Journal of the Acoustical Society of America 80 (1986): 612-621 en_US
dc.identifier.doi 10.1121/1.394056
dc.language.iso en_US en_US
dc.publisher Acoustical Society of America en_US
dc.title Measurement of fish target strength with a split‐beam echo sounder en_US
dc.type Article en_US
dspace.entity.type Publication
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relation.isAuthorOfPublication.latestForDiscovery 7409acce-91d2-41b3-9b6c-5e29bd508703
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