PMID: 753Nov 1, 1975

The effects of changes in pH and PCO2 in blood and water on breathing in rainbow trout, Salmo gairdneri

Respiration Physiology
R G Janssen, D J Randall

Abstract

The effect of sustained hypercapnia on the acid-base balance and gill ventilation in rainbow trout, Salmo gairdneri, was studied. The response to an increase in PICO2 from 0.3 to 5.2 mm Hg was a five-fold increase in gill ventilation volume and a slight increase in breathing frequency. There was a concomitant rise in PACO2 and an immediate fall in pHa. If PICO2 was maintained at 5.2 mm Hg for several days, ventilation volume gradually returned to the initial, prehypercapnic level within three days. Arterial pH also returned to the initial level within 2-3 days. These results are consistent with the hypothesis that under these conditions fish regulate pH via HCO3/C1 exchange across the gills rather than by changes in ventilation and subsequent adjustment of PACO2. A reduction in environmental pH causes a reduction in pHa but only a slow gradual increase in VG. Injections of HC1 or NaHCO3 into the blood have opposite effects on pHa but both cause a marked increase in VG. It is concluded that a rise in PACO2 results in a rise in VG and that changes in pH in blood or water have little direct effect on VG in rainbow trout. Possible location for receptors involved in this reflex response are discussed.

References

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Citations

Apr 1, 1993·Fish Physiology and Biochemistry·D J McKenzieS Aota
Feb 1, 1996·Fish Physiology and Biochemistry·Kathleen M Gilmour, S F Perry
May 1, 1987·Fish Physiology and Biochemistry·D J Randall, P A Wright
Jun 24, 2010·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Steve F PerryKathleen M Gilmour
Apr 1, 1978·Respiration Physiology·J N Cameron
May 1, 1987·Respiration Physiology·G A Dodd, William K Milsom
May 5, 2000·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·M L Burleson, N J Smatresk
Sep 7, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Kathleen M Gilmour
Jul 31, 2012·Respiratory Physiology & Neurobiology·William K Milsom
Jun 19, 2012·Respiratory Physiology & Neurobiology·Steve F Perry, Sara Abdallah
Oct 22, 2015·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Andrew J EsbaughAbbey S Johnson
Jul 3, 2010·Respiratory Physiology & Neurobiology·William K Milsom
Jul 22, 2009·Respiratory Physiology & Neurobiology·Li Zhang, Chris M Wood
May 12, 2009·Respiratory Physiology & Neurobiology·S F PerryKathleen M Gilmour
Oct 12, 2010·Respiratory Physiology & Neurobiology·Velislava TzanevaSteve F Perry
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Carbonic Acid Ions
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