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Olfactory flow in the sturgeon is externally driven.

Russell J Garwood1, Julia Behnsen2, Harriet K Haysom3

  • 1School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK.

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|June 24, 2019
PubMed
Summary
This summary is machine-generated.

Swimming alone drives olfactory flow in sturgeon (Huso dauricus). Fluid dynamics and computational fluid dynamics (CFD) reveal how swimming induces nasal and sensory channel flow, aiding odorant transport to sensory surfaces.

Keywords:
3D printingAphanopus carboChimaeridaeHexanchidaeMicro-computed tomographyPressure coefficientStatic pressureStreamline

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Area of Science:

  • Ichthyology
  • Fluid Dynamics
  • Sensory Biology

Background:

  • Olfaction is crucial for fish survival.
  • Fluid dynamics significantly influences olfactory processes in aquatic environments.
  • The sturgeon Huso dauricus possesses a unique olfactory rosette structure.

Purpose of the Study:

  • To investigate the hydrodynamics of the Huso dauricus nasal region.
  • To understand how swimming influences olfactory flow in this species.
  • To validate computational fluid dynamics (CFD) models with experimental data.

Main Methods:

  • Utilized dye visualization and computational fluid dynamics (CFD).
  • Created an anatomically accurate model from X-ray scans of a sturgeon specimen.
  • Simulated flow at a physiologically relevant Reynolds number.

Main Results:

  • Swimming-induced external flow drives flow through the nasal chamber and olfactory sensory channels.
  • Flow enters via incurrent nostrils and is dispersed through the sensory channels.
  • Vortices within the olfactory flow may enhance odorant transport.

Conclusions:

  • Swimming is sufficient to generate olfactory flow in H. dauricus.
  • Findings have implications for other sturgeon species and fishes with olfactory rosettes.
  • Hydrodynamics are critical for effective olfaction in fishes.