Document Detail

CO2 transport and excretion in rainbow trout (Oncorhynchus mykiss) during graded sustained exercise.
MedLine Citation:
PMID:  10701709     Owner:  NLM     Status:  MEDLINE    
A quantitative analysis of CO2 transport and excretion was conducted in seawater acclimated rainbow trout (Oncorhynchus mykiss) swimming at different sustained swimming velocities. CO2 excretion increased linearly with cardiac output during exercise but arterial P(CO2) (Pa(CO2)) and total CO2 levels also increased indicating a diffusion limitation to CO2 excretion. The elevated Pa(CO2) was not accompanied by a decrease in pH, indicating that the acid-base compensation was rapid. Mixed-venous P(CO2) increased to a greater extent than Pa(CO2) resulting in a large increase in the venous arterial difference in P(CO2) (Pv(CO2) - Pa(CO2)). The Pv(CO2) - Pa(CO2) difference was used to calculate the proportion of total CO2 excreted comprised of dissolved CO2 which accounted for less than 1% of total CO2 excreted in fish swimming at 11 cm sec(-1) but increased to about 9% at the greatest swimming velocity indicating that the pattern of CO2 excretion changes during exercise. There was no effect of exercise on the proportion of CO2 excreted which was dependent upon HCO3-/Cl- exchange (54%) or that which was dependent upon the dehydration of HCO3- that resided within the red cell prior to gill blood entry (42%). The large proportion of total CO2 excreted that was dependent upon HCO3-/Cl- exchange is significant because this is thought to be the rate limiting step in CO2 excretion.
C J Brauner; H Thorarensen; P Gallaugher; A P Farrell; D J Randall
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Respiration physiology     Volume:  119     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-03-16     Completed Date:  2000-03-16     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  69-82     Citation Subset:  IM    
Department of Zoology, University of British Columbia, Vancouver, Canada.
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MeSH Terms
Biological Transport / physiology
Carbon Dioxide / blood*
Erythrocytes / metabolism
Motor Activity / physiology*
Oncorhynchus mykiss / blood,  physiology*
Reg. No./Substance:
124-38-9/Carbon Dioxide

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