Exploratory and Instantaneous Swimming Speeds of Amphidromous Fish School in Shallow-Water Coastal Lagoon Channels |
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| Authors: | Patrice Brehmer Jean Guillard Pablo I Caballero Pinzon Pascal Bach |
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| Institution: | 1.IRD, UMR 196 LEMAR (CNRS, IRD, UBO), Marine Environmental Sciences Laboratory,Plouzané,France;2.INRA, UMR CARRTEL, Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques,Thonon-les-Bains,France;3.CRH (IRD, Ifremer, Université de Montpellier 2),Sète,France;4.IRD, UMR 212 EME (IRD, Ifremer, Université de Montpellier 2),Marine Exploited Ecosystems, SEMIR,Le Port,France |
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| Abstract: | Fish school swimming speeds is essential for ecological and management studies. The multibeam sonar in horizontal beaming
provided dynamic echo traces of mobile fish schools. We used two school swimming speed indicators: the average of a series
of instantaneous speed values, and the exploratory speed. These swimming speeds were estimated for each fish school observed
on the basis of their Euclidian position within the sonar beams. The average ISS values per school ranged from 0.15 m s−1 to 4.46 m s−1, while the ESS values per school were lower, ranging from 0.04 m s−1 to 3.77 m s−1. Multibeam sonar technology makes it possible to measure fish school swimming speeds in their natural habitat at small spatio-temporal
scales. This methodology can therefore be used to analyse in situ their movements, and has a wide range of applications in
behavioural studies and management purposes. |
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