Different Collective Behaviors in Different Small Schools of <i>Plecoglossus altivelis</i>

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  • NIIZATO Takayuki
    Faculty of Engineering, Information and Systems, Tsukuba University
  • MURAKAMI Hisashi
    School of Fundamental Science and Engineering, Waseda University
  • SANGU Kazuki
    Faculty of Engineering, Information and Systems, Tsukuba University
  • TOMARU Takenori
    School of Fundamental Science and Engineering, Waseda University
  • NISHIYAMA Yuta
    Science & Technology Entrepreneurship Laboratory (e-square), Osaka University
  • SONODA Kohei
    College of Information Science and Engineering, Ritsumeikan University
  • GUNJI Yukio-Pegio
    School of Fundamental Science and Engineering, Waseda University

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Other Title
  • 少数個体の鮎(<i>Plecoglossus altivelis</i>)が形成する群れとその個体数による振る舞いの変化
  • 少数個体の鮎(Plecoglossus altivelis)が形成する群れとその個体数による振る舞いの変化
  • ショウスウ コタイ ノ アユ(Plecoglossus altivelis)ガ ケイセイ スル ムレ ト ソノ コタイスウ ニ ヨル フルマイ ノ ヘンカ
  • Different Collective Behaviors in Different Small Schools of Plecoglossus altivelis (in Japanese)

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In this study, we examine the radical difference between a single and a few individuals behavior. To investigate this difference, we use a fish (Plecoglossus altivelis, ayu or sweetfish) in an unfamiliar environment. We allow the fish to swim freely in a large shallow tank in a controlled laboratory and we track the fish's trajectories. In our experiment, although all trajectories of individuals show Lévy walk behavior, which is known as the optimal strategy for resolving the trade-off between exploration and exploitation, those trajectories of individuals were markedly different depending on whether they were alone or in a group. Our result suggests that the concepts of “whole” for a single fish and a group may be different. Furthermore, we also find that a leader of a group frequently changes though a trial.

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