Document Detail

Tribute to R. G. Boutilier: acid-base transfer across fish gills.
MedLine Citation:
PMID:  16547290     Owner:  NLM     Status:  MEDLINE    
The gills are the major site of acid-base regulation in most fish. Acid-base transfer across fish gills is dominated by carbon dioxide and ammonia excretion, especially the former. Bicarbonate buffering in the blood is less than that found in mammals; regulation of ventilation has little effect on CO(2) levels in the blood and control of ventilation is not used to regulate body pH in fish. Proton ATPase (freshwater fish), Na(+)/H(+) exchangers (marine fish) and anion exchangers (marine and freshwater fish) are located in the gills. These transporters contribute to the regulation of internal pH, but little is known about how this is done in fish. Fish kept in confined water volumes acidify their environment, largely due to CO(2). This acidification augments ammonia excretion and reduces ammonia toxicity. The possible involvement of ammonia recycling in acid excretion is also discussed.
D J Randall; T K N Tsui
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  209     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-03-20     Completed Date:  2006-06-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1179-84     Citation Subset:  IM    
Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, SAR China.
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MeSH Terms
Acid-Base Equilibrium*
Ammonia / metabolism
Antiporters / metabolism
Bicarbonates / metabolism
Biological Transport
Carbon Dioxide / blood
Cypriniformes / metabolism*
Gills / metabolism*
Goldfish / metabolism*
Hydrogen-Ion Concentration
Proton-Translocating ATPases / metabolism
Sodium-Hydrogen Antiporter / metabolism
Vacuolar Proton-Translocating ATPases / metabolism
Reg. No./Substance:
0/Antiporters; 0/Bicarbonates; 0/Sodium-Hydrogen Antiporter; 124-38-9/Carbon Dioxide; 7664-41-7/Ammonia; EC 3.6.1.-/Vacuolar Proton-Translocating ATPases; EC ATPases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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