Post-prandial metabolic alkalosis in the seawater-acclimated trout: The alkaline tide comes in

Carol Bucking, John L. Fitzpatrick, Sunita R. Nadella, Chris M. Wood

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The consequences of feeding and digestion on acid-base balance and regulation in a marine teleost (seawater-acclimated steelhead trout; Oncorhynchus mykiss) were investigated by tracking changes in blood pH and [HCO3-], as well as alterations in net acid or base excretion to the water following feeding. Additionally the role of the intestine in the regulation of acid-base balance during feeding was investigated with an in vitro gut sac technique. Feeding did not affect plasma glucose or urea concentrations, however, total plasma ammonia rose during feeding, peaking between 3 and 24 h following the ingestion of a meal, three-fold above resting control values (∼300μmol ml-1). This increase in plasma ammonia was accompanied by an increase in net ammonia flux to the water (-twofold higher in fed fish versus unfed fish). The arterial blood also became alkaline with increases in pH and plasma [HCO3-] between 3 and 12 h following feeding, representing the first measurement of an alkaline tide in a marine teleost. There was no evidence of respiratory compensation for the measured metabolic alkalosis, as PaC02 remained unchanged throughout the post-feeding period. However, in contrast to an earlier study on freshwater-acclimated trout, fed fish did not exhibit a compensating increase in net base excretion, but rather took in additional base from the external seawater, amounting to -8490μmolkg-1 over 48h. In vitro experiments suggest that at least a portion of the alkaline tide was eliminated through increased HCO3- secretion coupled to Cl - absorption in the intestinal tract. This did not occur in the intestine of freshwater-acclimated trout. The marked effects of the external salinity (seawater versus freshwater) on different post-feeding patterns of acid-base balance are discussed.

Original languageEnglish
Pages (from-to)2159-2166
Number of pages8
JournalJournal of Experimental Biology
Volume212
Issue number14
DOIs
StatePublished - Jul 15 2009

Fingerprint

Alkalosis
acid-base balance
Trout
Seawater
trout
tides
Meals
Acid-Base Equilibrium
tide
intestines
ammonia
seawater
Fresh Water
Ammonia
fish feeds
Fishes
Oncorhynchus mykiss
excretion
Intestines
blood pH

Keywords

  • Acid-base balance
  • Digestion
  • Fish
  • Gastric acid secretion
  • Gill
  • Intestine
  • Teleost

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Physiology
  • Insect Science
  • Aquatic Science

Cite this

Post-prandial metabolic alkalosis in the seawater-acclimated trout : The alkaline tide comes in. / Bucking, Carol; Fitzpatrick, John L.; Nadella, Sunita R.; Wood, Chris M.

In: Journal of Experimental Biology, Vol. 212, No. 14, 15.07.2009, p. 2159-2166.

Research output: Contribution to journalArticle

Bucking, Carol ; Fitzpatrick, John L. ; Nadella, Sunita R. ; Wood, Chris M. / Post-prandial metabolic alkalosis in the seawater-acclimated trout : The alkaline tide comes in. In: Journal of Experimental Biology. 2009 ; Vol. 212, No. 14. pp. 2159-2166.
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