1. Comparing hydroacoustic fish stock estimates in the pelagic zone of temperate deep lakes using three sound frequencies (70, 120, 200 kHz)
- Author
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Adam Jóźwik, Helge Balk, Małgorzata Godlewska, Michel Colon, Anne Lebourges-Daussy, Jean Guillard, Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD), University of Oslo (UiO), Polish Academy of Sciences (PAN), United Nations Educational, Scientific and Cultural Organization (UNESCO), and Polonium program (EGIDE in France) Polonium program (statutory funds of IRS in Poland)
- Subjects
0106 biological sciences ,WFD ,standardisation ,target strength ,Aquatic Science ,Fish stock ,01 natural sciences ,Echo sounding ,Abundance (ecology) ,Hydroacoustics ,Temperate climate ,14. Life underwater ,Target strength ,Population dynamics of fisheries ,Water Science and Technology ,hydroacoustics ,multifrequency ,010604 marine biology & hydrobiology ,ACL ,Pelagic zone ,04 agricultural and veterinary sciences ,Oceanography ,[SDE]Environmental Sciences ,040102 fisheries ,0401 agriculture, forestry, and fisheries ,Environmental science ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology - Abstract
Several decades of research have led to the acceptance of hydroacoustics as a reliable measurement method to monitor fish population in lakes, but full standardisation and intercalibration are still lacking. The aim of this study was to investigate the effect of sound frequency on acoustic parameters, such as volume backscattering strength, target strength, and the estimation of fish abundance. Data were recorded in situ using 3 frequencies (70, 120, 200 kHz) simultaneously in 2 different lakes. The results among the frequencies were compared and statistically tested. Data from the 70 and 120 kHz frequencies yielded similar results, but the 200 kHz echosounder estimates in temperate lakes seemed different, especially in cases of high fish abundance, which is typical of eutrophic ecosystems. This work indicates that the abundance estimates of fish populations in temperate lakes based on 200 kHz frequency may differ from results obtained using lower frequencies, and that further study is needed.
- Published
- 2014
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