caa a22 4500 445894326 CHVBK 20180317145626.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-010-0549-4 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0549-4 Anisotropy and shift of search behavior in Malabar grouper ( Epinephelus malabaricus ) larvae in response to prey availability [Elektronische Daten] [Mohamed-Sofiane Mahjoub, Sami Souissi, François Schmitt, Fan-Hua Nan, Jiang-Shiou Hwang] In order to enhance encounters with prey, planktonic predators may display different swimming behavior with respect to food availability and distribution. In this study, we used 3D video techniques to record the swimming behavior of malabar grouper (Epinephelus malabaricus) larvae in both the absence and the presence of prey (Artemia sp. nauplii). Swimming properties were investigated in all of the 3D, the two vertical, and the horizontal projections using scale-dependent (mean speed and Net to Gross Displacement Ratio) and scale-independent (fractal dimension) metrics. When prey was added, larvae swam slower and in a less convoluted way as compared to what was observed in the absence of food. The results obtained with scale-dependant metrics were confirmed by those obtained with scale-independent analyses. Both unveiled the anisotropy of the swimming behavior of grouper larvae that tend to swim toward the vertical axis in order to maximize encounters with prey patches. This study shows that malabar grouper larvae can optimize their search volume by switching their behavior and further draws attention to the need to consider both vertical- and horizontal-projections components while addressing the plankter's swimming trajectories. Springer Science+Business Media B.V., 2010 Grouper nationallicence Fish larva nationallicence Search behavior nationallicence Trajectory analysis nationallicence Plankton behavior nationallicence Mahjoub Mohamed-Sofiane Institute of Marine Biology, National Taiwan Ocean University, 202, Keelung, Taiwan aut Souissi Sami Université Lille Nord de France, 59000, Lille, France aut Schmitt François Université Lille Nord de France, 59000, Lille, France aut Nan Fan-Hua Department of Aquaculture, National Taiwan Ocean University, 202, Keelung, Taiwan aut Hwang Jiang-Shiou Institute of Marine Biology, National Taiwan Ocean University, 202, Keelung, Taiwan aut Hydrobiologia Springer Netherlands 666/1(2011-05-01), 215-222 0018-8158 666:1<215 2011 666 10750 https://doi.org/10.1007/s10750-010-0549-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0549-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mahjoub Mohamed-Sofiane Institute of Marine Biology, National Taiwan Ocean University, 202, Keelung, Taiwan aut NATIONALLICENCE 700 1- Souissi Sami Université Lille Nord de France, 59000, Lille, France aut NATIONALLICENCE 700 1- Schmitt François Université Lille Nord de France, 59000, Lille, France aut NATIONALLICENCE 700 1- Nan Fan-Hua Department of Aquaculture, National Taiwan Ocean University, 202, Keelung, Taiwan aut NATIONALLICENCE 700 1- Hwang Jiang-Shiou Institute of Marine Biology, National Taiwan Ocean University, 202, Keelung, Taiwan aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 666/1(2011-05-01), 215-222 0018-8158 666:1<215 2011 666 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer