Institution: | a CNRS-IREMER, CREMA L'Houmeau, B.P. 5, 17137 L'Houmeau, France b Faculté des Sciences de Sfax, Département de Biologie, B.P. 802, 3018, Sfax, Tunisia c CNRS, Centre d'Etudes Biologiques de Chizé, 79360 Villiers-en-Bois, France |
Abstract: | Under conditions of intensive culture, the acoustic signals produced by fish during feeding depend on their feeding mode. Exclusive suction, as used by turbot, is characterised by a maximum acoustic energy in the frequency range 7–9 kHz and a sound duration of about one minute depending of time duration of pellet distribution. Suction feeding in conjunction with forward swimming, as employed by brown trout and rainbow trout, had a maximum acoustic energy in the frequency range 4–6 kHz and feeding sounds were measurable only for short periods (less than 1 s) in between two pellet distributions by hand. The brevity of these feeding sounds (ca. 1000 ms) requires adapting the turbot acoustic-detection systems to actively feeding fish for developing automated feed distribution systems feasible in trout aquaculture. |