Fish Physiology and Biochemistry

, Volume 15, Issue 1, pp 65–69

Drinking rate in juvenile Atlantic salmon,Salmo salar L fry in response to a nitric oxide donor, sodium nitroprusside and an inhibitor of angiotensin converting enzyme, enalapril

  • Juan Fuentes
  • J. C. McGeer
  • F. B. Eddy
Article

DOI: 10.1007/BF01874839

Cite this article as:
Fuentes, J., McGeer, J.C. & Eddy, F.B. Fish Physiol Biochem (1996) 15: 65. doi:10.1007/BF01874839

Abstract

Drinking in freshwater juvenile salmon was investigated in response to vasodilation by sodium nitroprusside (SNP), a nitric oxide donor, which significantly increased blood vessel diameter in Atlantic salmon alevins. Atlantic salmon fry (1–3 g), as previously shown, drank at a significant rate in fresh water which doubled to about 1.2 ml kg−1 h−1 following injection of SNP (100 μmol kg−1), through dilation of body vasculature and activation of a vasoconstrictive mechanism, the endogenous renin angiotensin system (RAS). This response was 50% inhibited by injection of about 100 mg kg−1 enalapril. Fry increased drinking in response to SNP administered in the water, though the concentration required for maximal response, 1.6 mmol l−1, was much greater than for injected SNP; this response was also inhibited by enalapril injection. Possible involvement of the gill vasculature and branchial osmoreceptors or baroreceptors in control of the drinking response is discussed.

Keywords

salmon frydrinkingnitric oxiderenin angiotensin system

Copyright information

© Kugler Publication bv 1996

Authors and Affiliations

  • Juan Fuentes
    • 1
  • J. C. McGeer
    • 2
  • F. B. Eddy
    • 2
  1. 1.Department of Physiology, Faculty of Biological SciencesUniversity of SantiagoSantiago de CompostelaSpain
  2. 2.Department of Biological SciencesUniversity of DundeeDundeeScotland, UK