Dynamical properties of fish schooling behavior

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Dynamical properties of fish schooling behavior

• Masaaki ISHIKAWA
• Hydraulics and Environmental River eng. Lab.
• Dept. of Civil and Environmental Eng.
• Kisarazu National College of Technology
• KNCT - HERL

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INTRODUCTION

• HYPOTHESES
• Basic system of ecosystem is interaction
• Rules and Randomness ? 1/f fluctuation
• Evolution process is very hard.
• Complicated and delicate system is broken.
• ECOSYSTEM RULES RANDOMNESS
• ECOSYSTEM
• COMPLEX ADAPTIVE SYSTEM

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PURPOSE

• Perception of dynamical properties of fish
  schooling behavior
• Modeling of fish schooling behavior
• Development of software for simulation
• FUTURE PREDICTION
• We are able to design optimum fish pass location
  and effective escape zone for fish in flood.

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Observation Experiment

• Experimental channel

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Basic Behavior Rules of IBM

• Individual Based Model

Fish swim against the current
Interaction to nearest other fish
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Definition of Fish School Radius Rfs

• Fish school radius that indicate expanse of fish
  school.

Rfs fish school radius N the number of fish in
school ri the distance from center of school to
each fish
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Power spectrum diagram Static Water

• Fish School Radius

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Power spectrum diagram Dynamic Water

• Fish School Radius

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RESULTS

• By fish observation experiments,a minimum
  distance between individual fish is equal to
  about 0.03 m (fish body length 0.10m)
• A changes of expanse fish school is1/f or 1/f2
  fluctuation.
• Complex fish schooling behavior was expressed by
  simple basic behavior ruleswith randomness.

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Software Development

• Virtual HabitatSimulation model VHS
• EnvironmentMicrosoft Windows98Borland
  DelphiVersion.4(PASCAL)
• For more Info.http//chaos.kisarazu.ac.jp/ishika
  wa/English/VHS-Fish/ishikawa_at_wangan.c.kisarazu.ac
  .jp