Video analysis of fish schooling behavior in finite space using a mathematical model

概要

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The schooling behavior of the fish Parapristipoma trilineatum (chicken grunt) was examined for a range of school sizesin a water tank containing a central columnar structure using a mathematical model of fish schooling behavior that wasmodified from that of Sannomiya and Matuda. The two-dimensional motion of individuals was captured on digital video overabout 10 min, and these time-series data were used to tune the model to the experimental conditions. The model parameterswere then used to evaluate schooling behavior quantitatively. Comparing force magnitudes between experimental conditionsrevealed that propulsive force was less in a tank without the central structure than in a tank with the central structure, under allconditions tested. These results indicate that the school was less active under unobstructed conditions. Propulsive force alsodecreased with increasing school size. Attractive and repulsive forces of the walls were dominant for smaller school sizes;the attractive and repulsive forces of the structure were significant only for the largest school tested (25 individuals). Thus,changes in behavioral patterns caused by the number of individuals or the presence of structures can be expressed using themathematical model.
Elsevierの論文
2003-01-30