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ICES Journal of Marine Science: Journal du Conseil 2004 61(2):267-273; doi:10.1016/j.icesjms.2003.11.007
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Simultaneous Sv and TS measurements on Young-of-the-Year (YOY) freshwater fish using three frequencies

J Guillarda,*, A Lebourges-Dhaussyb and P Brehmera

a Institut de Recherches pour le Développement US004 - UR061, BP 171, 34203 Sète, France
b Institut de Recherches pour le Développement US004, BP 70, 29280 Plouzané, France

*Correspondence to J. Guillard: Institut National de Recherche Agronomique, CARRTEL, BP 511, 74203 Thonon les Bains, France; tel: +33 4 50 26 78 51; fax: +33 4 50 26 07 60. e-mail: guillard{at}thonon.inra.fr.

In autumn, the fish population above the thermocline in Lake Annecy mainly comprises young perch (Perca fluviatilis) of the year. The fish are distributed in schools during the day and as scattered individual fish targets at night. Measurements of volume-backscattering strength and target strengths (TS) were carried out in a synchronous way using three echosounders operating at three frequencies (70, 120, and 129 kHz), with different characteristics (split beam, dual beam, beam shape, pulse length, etc.). Target-strength values show variability from one elementary sampling unit to another and from one device to another, but the mean global TS values are similar, independently of the frequency. The volume-backscattering strengths measured on precise schools by the three acoustic devices give significantly similar results. Acoustic measurements on YOY perch are completely independent of the frequency and the characteristics of the echosounders.

Keywords: dual beam, freshwater, lake, multi-frequency, Perca fluviatilis, split beam, target strength

Received 21 July 2003; accepted 19 November 2003.


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