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Related Experiment Videos

Serotonergic vasomotor control in fish gills

L Sundin1

  • 1Department of Zoophysiology, University of Göteborg, Sweden.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|November 1, 1995
PubMed
Summary

Serotonin impacts fish gill blood flow by constricting vessels in some areas and dilating others. This research clarifies serotonin

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Area of Science:

  • Ichthyology
  • Comparative Physiology
  • Aquatic Toxicology

Background:

  • Serotonin (5-hydroxytryptamine, 5-HT) is found in fish gill neuroepithelial cells (NECs).
  • Teleost fish possess serotonergic innervation in gill filaments, primarily affecting branchial vasoconstriction.
  • Previous studies suggested serotonin constricts the proximal efferent filamental artery (EFA) and efferent lamellar arterioles (ELA) in teleosts.

Purpose of the Study:

  • To investigate the precise vascular effects of serotonin in fish gills.
  • To differentiate the roles of serotonin in the respiratory and arterio-venous pathways.
  • To understand how serotonin influences blood flow regulation and gas exchange in fish.

Main Methods:

  • Administration of serotonin (5-hydroxytryptamine) to fish models (rainbow trout, Atlantic cod).
  • Pharmacological blockade of serotonin receptors using 5-HT-receptor antagonist methysergide.
  • Observation and analysis of vascular responses, including vasoconstriction and vasodilation, in gill vasculature.

Main Results:

  • Serotonin causes vasoconstriction in the distal filament vasculature of rainbow trout, potentially impairing gas exchange.
  • In Atlantic cod, serotonin dilates the arterio-venous pathway, redirecting blood flow.
  • The vasoconstrictory effects of serotonin are reversible with methysergide, while vasodilatory effects are not.

Conclusions:

  • Serotonin exhibits complex and differential effects on fish gill vasculature.
  • Serotonin's role in regulating blood flow is pathway-specific, impacting both respiratory and arterio-venous circuits.
  • Understanding these mechanisms is crucial for fish physiology and aquatic environmental health.

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