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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50165

Title: Anisotropy and shift of search behavior in Malabar grouper (Epinephelus malabaricus) larvae in response to prey availability
Authors: Mahjoub, M. S
Schmitt, F. G
Souissi, S
Nan, F. H
Hwang, J. S
Contributors: 國立臺灣海洋大學:水產養殖學系
Keywords: Grouper
Fish larva
Search behavior
Trajectory analysis
Plankton behavior
Date: 2011-07
Issue Date: 2018-09-17T08:33:52Z
Publisher: Hydrobiologia
Abstract: Abstract: 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.
Relation: 666(1) pp.215–222
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50165
Appears in Collections:[水產養殖學系] 期刊論文

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