Brehmer Patrice auteur aut IRD Guillard J. auteur aut IRD Pinzon P. I. C. auteur aut IRD Bach Pascal auteur aut IRD text journalArticle eng text/pdf born digital access 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. specialized Gregarious fish Direct approach Indicator Schooling Horizontal beaming Sonar 034 34 4 739-744 2011 1559-2723 https://www.documentation.ird.fr/hor/fdi:010053592 10.1007/s12237-011-9409-3 1559-2723 [F B010053592] https://www.documentation.ird.fr/hor/fdi:010053592 https://www.documentation.ird.fr/intranet/publi/2011/06/010053592.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-07-01 2017-08-23 fdi:010053592 fre