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Suivi des peuplements ichtyologiques en milieu estuarien par approche acoustique : application à l’estuaire de la Gironde

Abstract : For many years, assessments of fish densities within the Gironde estuary have been based on a number of different fish monitoring techniques, as well as professional and scientific surveys. However, these approaches are often destructive. They require substantial sampling, and are limited from the points of view of both time and space. With this in mind, the benefits of non-invasive acoustic monitoring are clear. While such methods are often used in lakes and other marine environments, they have yet to be widely applied to shallow-water areas, in particular estuaries. Applying an acoustic approach to this kind of intrinsically changeable environment represents a real challenge. In this research project, an in-depth methodological study was carried out to determine the optimum way of applying acoustic sampling. Several acoustic monitoring strategies were then tested, keeping in mind the size and complexity of the ecosystem under investigation. The results of these tests were then checked for relevance against data from scientific fisheries. Finally, hydroacoustics was used to examine fish dynamics at finer spatial and temporal scales, notably in the study of diurnal and tidal influences. The results of this study show that it is possible to use acoustic monitoring to complement traditional methods of estimating fish populations in estuarine areas, and that the use of such a combination opens up a broad range of new possibilities.
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Submitted on : Wednesday, October 16, 2013 - 1:04:20 AM
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Valérie Samedy. Suivi des peuplements ichtyologiques en milieu estuarien par approche acoustique : application à l’estuaire de la Gironde. Sciences agricoles. Université Sciences et Technologies - Bordeaux I, 2013. Français. ⟨NNT : 2013BOR14815⟩. ⟨tel-00873569⟩

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