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Updated: Jun 10, 2025

The Three-Chamber Choice Behavioral Task using Zebrafish as a Model System
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Confinement-driven state transition and bistability in schooling fish.

Baptiste Lafoux1, Paul Bernard1, Benjamin Thiria1

  • 1<a href="https://ror.org/03kr50w79">Laboratoire de Physique et Mécanique des Milieux Hétérogènes (PMMH)</a>, <a href="https://ror.org/02feahw73">CNRS</a> UMR 7636, <a href="https://ror.org/03zx86w41">ESPCI Paris</a>-<a href="https://ror.org/013cjyk83">PSL Research University</a>, <a href="https://ror.org/02en5vm52">Sorbonne Université</a>, <a href="https://ror.org/05f82e368">Université Paris Cité</a>, 10 Rue Vauquelin, 75005 Paris, France.

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Summary
This summary is machine-generated.

Confinement density influences fish schooling behavior, causing transitions between polarized and milling states. This study reveals how space affects group dynamics and provides insights for active matter models.

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Area of Science:

  • Collective behavior in animal groups
  • Active matter physics
  • Animal collective motion

Background:

  • Animal schooling behavior involves complex dynamics.
  • Understanding state transitions in confined animal groups is crucial.
  • Previous models often simplify the role of environmental constraints.

Purpose of the Study:

  • To investigate how confinement density affects state transitions in rummy-nose tetra fish schools.
  • To analyze the bistable states observed during transitions.
  • To model the transition dynamics using a Markov process.

Main Methods:

  • Controlled experiments with rummy-nose tetra fish (Hemigrammus rhodostomus).
  • Manipulation of confinement density (individuals per unit area).
  • Observation and analysis of schooling states (polarization and milling).
  • Application of a two-state Markov process for modeling.

Main Results:

  • Confinement density drives a continuous transition between polarized and milling states.
  • A bistable state, with coexisting polarization and milling, was observed.
  • The transition dynamics were accurately described by a two-state Markov process.
  • Confinement density modulated the transition times between states.

Conclusions:

  • Confinement density is a critical factor in regulating state transitions in moving animal groups.
  • The findings offer an experimental benchmark for active matter theories involving confined self-propelled agents.
  • This research advances the understanding of collective behavior under spatial constraints.