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Entraining in trout: a behavioural and hydrodynamic analysis.

Anja Przybilla1, Sebastian Kunze, Alexander Rudert

  • 1Institute of Zoology, University of Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany. przyb@uni-bonn.de

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Rheophilic fish, like rainbow trout, use entraining behavior to hold positions in turbulent water. They minimize energy by angling their bodies to cancel drag forces using lift and wake suction.

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Area of Science:

  • Ichthyology
  • Fluid Dynamics
  • Biomechanics

Background:

  • Rheophilic fish inhabit environments with unsteady flows and turbulence.
  • Instead of avoiding these zones, rheophilic fish actively seek them for station holding.
  • This station-holding behavior in running water is known as entraining.

Purpose of the Study:

  • To investigate the entraining behavior of rainbow trout in the wake of submerged objects.
  • To identify the hydrodynamic mechanisms enabling efficient station holding in turbulent flows.
  • To understand how fish minimize energy expenditure while maintaining position.

Main Methods:

  • Observing rainbow trout entraining behavior near a D-shaped cylinder and a flat plate.
  • Analyzing flow characteristics around an artificial trout model at preferred positions.
  • Performing 3-D unsteady computational fluid dynamics (CFD) simulations to calculate pressure forces.

Main Results:

  • Entraining trout positioned themselves near objects, maintaining position with minimal body or fin motion.
  • Hydrodynamic analysis revealed that fish tilt their bodies to balance drag with lift and wake suction forces.
  • Small fin movements were sufficient to maintain equilibrium in unsteady flow conditions.

Conclusions:

  • Entraining allows rheophilic fish to conserve energy by utilizing hydrodynamic forces for station holding.
  • The study elucidates the physical mechanisms behind this behavior, highlighting the role of lift and wake suction.
  • Understanding these adaptations can inform the design of fish-friendly hydraulic structures.