Počet záznamů: 1

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

  1. 1.
    0330234 - BC-A 2010 RIV GR eng C - Konferenční příspěvek (zahraniční konf.)
    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]
    Grant CEP: GA ČR(CZ) GA206/07/1392
    Grant ostatní:NFM(CZ) CZ 0091
    Výzkumný záměr: CEZ:AV0Z60170517
    Klíčová slova: acoustic fish assessment * target strength * water framework directive
    Kód oboru RIV: EH - Ekologie - společenstva

    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.
    Trvalý link: http://hdl.handle.net/11104/0176068