Acid–base regulation during hypercapnia, exercise and anoxia in the armoured catfish, Liposarcus pardalis

Brauner, C. J., Baker, D., Hanson, L., Kuchel, L., Jackson, D., Farrell, A. P. and Val, V. L. (2007). Acid–base regulation during hypercapnia, exercise and anoxia in the armoured catfish, Liposarcus pardalis. In: , Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology: Seventh International Congress of Comparative Physiology and Biochemistry, Salvador, Bahia, Brazil, August 12–16, 2007. Seventh International Congress of Comparative Physiology and Biochemistry, Salvador, Bahia, Brazil, (S40-S40). August 12–16, 2007.


Author Brauner, C. J.
Baker, D.
Hanson, L.
Kuchel, L.
Jackson, D.
Farrell, A. P.
Val, V. L.
Title of paper Acid–base regulation during hypercapnia, exercise and anoxia in the armoured catfish, Liposarcus pardalis
Conference Paper Type Published Abstract
Conference name Seventh International Congress of Comparative Physiology and Biochemistry
DOI 10.1016/j.cbpa.2007.06.102
Conference location Salvador, Bahia, Brazil
Conference dates August 12–16, 2007
Proceedings title Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology: Seventh International Congress of Comparative Physiology and Biochemistry, Salvador, Bahia, Brazil, August 12–16, 2007  (ERA 2012 Listed)    (ERA 2010 Rank B)   Check publisher's open access policy
Journal name Comparative Biochemistry and Physiology A-Molecular  (ERA 2012 Listed)    (ERA 2010 Rank B)   Check publisher's open access policy
Place published New York
Publisher Elsevier
Publication date 2007
Volume number 148
Issue number Supplement 1
ISSN 1095-6433
Start page S40
End page S40
Total pages 1
Language eng
Abstract/Summary During exposure to elevated water CO2 levels (hypercapnia), blood pH and tissue intracellular pH (pHi) in fish are initially reduced due to the rapid development of a respiratory acidosis. Blood pH recovery is associated with acid–base relevant ion transfer at the gills (i.e., Na+/H+ or Cl−/HCO3−), and generally occurs over 24–48 h during which time pHi recovery closely follows pH recovery of the blood. In the armoured catfish, Liposarcus pardalis, hypercapnia induces a large respiratory acidosis, but intracellular pH (pHi) of tissues such as the liver, heart and muscle is tightly regulated despite large reductions in plasma pH. Using an in situ perfused heart preparation, maximum cardiac performance (power output, cardiac output and stroke volume) was maintained at levels of up to 5% CO2 in L. pardalis. Maintenance of heart function under these conditions was associated with preferential pHi regulation. Following exhaustive exercise and 2 h of anoxia, there was little evidence for lactate incorporation into the skull or bony plates, but liver, heart and brain pHi were preferentially regulated despite a large uncompensated plasma acidosis, indicating that the type of acidosis does not alter the pattern of acid–base regulation in this species. This pattern of preferential pHi regulation differs markedly from that of most fish investigated to date; however, it has also been observed in two other facultative air-breathing fishes, Synbranchus marmoratus and Amia calva, and may be associated with the evolution of air-breathing.
Subjects 0606 Physiology
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Publication History: Formerly known as Comparative Biochemistry and Physiology Part A: Physiology

Document type: Conference Paper
Sub-type: Published Abstract
Collections: Excellence in Research Australia (ERA) - Collection
School of Biological Sciences Publications
 
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