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Related Experiment Videos

Studies on the fish gill microclimate.

K L Shephard1

  • 1Clore Laboratory for Life Sciences, University of Buckingham, England.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
|January 1, 1992
PubMed
Summary

A new fish gill preparation allows measurement of sodium concentration and water velocity. Findings suggest simple diffusion explains ion movement, refuting significant unstirred layers in fish gills.

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Area of Science:

  • Physiology
  • Environmental Science
  • Biochemistry

Background:

  • Investigating fish gill microclimate is crucial for understanding ion transport.
  • Previous models often assumed significant unstirred layers, potentially overestimating diffusion resistance.

Purpose of the Study:

  • To develop and validate an isolated, perfused fish gill filament preparation.
  • To measure sodium concentration and water velocity within the gill microenvironment.
  • To refine models of ion movement across fish gill surfaces.

Main Methods:

  • Isolated and perfused fish gill filament preparation.
  • Measurement of sodium concentration at lamellar surface and exit water.
  • Measurement of water velocity within secondary lamellae.

Main Results:

  • Gill surface sodium concentration (0.146 mmol.l-1) exceeded external levels (0.10 mmol.l-1).
  • Exit water sodium concentration (0.118 mmol.l-1) was lower than gill surface.
  • Interlamellar water velocity (1.5 cm.s-1) was significantly lower than external flow (18 cm.s-1).

Conclusions:

  • The developed preparation effectively simulates fish gill microclimate conditions.
  • Simple diffusion and parabolic velocity profiles adequately explain net sodium movement.
  • Substantial unstirred layers are unlikely to exist at the lamellar surfaces in this preparation.

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