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Regressions for conversion between target strength and fish length in horizontal acoustic surveys

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    0330234 - BC-A 2010 RIV GR eng C - Conference Paper (international conference)
    Kubečka, Jan - Frouzová, Jaroslava - Balk, H. - Čech, Martin - Draštík, Vladislav - Prchalová, Marie
    Regressions for conversion between target strength and fish length in horizontal acoustic surveys.
    Underwater acoustic measurements, Technologies & Results. Heraklion: Foundation for Research & Technology, 2009 - (Papadakis, J.; Bjorno, L.), s. 1039-1044. ISBN 978-960-98883-2-5.
    [Underwater acoustic measurements, Technologies & Results. Nafplion (GR), 21.06.2009-27.06.2009]
    R&D Projects: GA ČR(CZ) GA206/07/1392
    Grant - others:NFM(CZ) CZ 0091
    Institutional research plan: CEZ:AV0Z60170517
    Keywords : acoustic fish assessment * target strength * water framework directive
    Subject RIV: EH - Ecology, Behaviour

    Both ways conversions between fish target strength (TS) and length are extremely important for the accuracy of acoustic fisheries surveys. At present, no universal method is available for aspect corrections during mobile horizontal surveys. For random aspect situations, the deconvolution of fish aspect in the beam can be used converting all TS to side aspect whose relationship to length is well known. For converting catch data to TS, the regression of TS of average horizontal backscattering strength on length can be applied successfully. The average regressions for common European species are being suggested for routine acoustic surveys in combination with direct pelagic fishing for the assessment of ecological status of lakes and reservoirs for EU Water framework directive. This approach reduces the resolution towards local fish size variations but simplifies the processing and provides much better definition of fish abundance.
    Permanent Link: http://hdl.handle.net/11104/0176068