Document Detail

Ventilatory flow relative to intrabuccal and intraopercular volumes in the serrasalmid fish Piaractus mesopotamicus during normoxia and exposed to graded hypoxia.
MedLine Citation:
PMID:  10959108     Owner:  NLM     Status:  Publisher    
Ventilation volume Vg - mlH2O.min-1 ), respiratory frequency (fR - breaths.min-1) and tidal volume (VT - mlH2O.breath-1 ) were measured in a group of Piaractus mesopotamicus (650.4 +/- 204.7 g; n = 10) during normoxia and in response to graded hypoxia. The fR was maintained constant, around 100 breaths.min-1, from normoxia until the O2 tension of the inspired water (PiO2) of 53 mmHg, below which it increased progressively, reaching maximum values (157.6 +/- 6.3 breaths.min-1) at 10 mmHg. The VT rose from 1.8 +/- 0.1 to 6.0 +/- 0.5 and 5.7 +/- 0.4 mlH2O. breath-1 in the PiO2 of 16 and 10 mmHg, respectively. The Vg increased from 169.3 11.0 (normoxia) to 940.1 +/- 85.6 mlH2O. min-1 at the PiO2 of 16 mmHg, below which it also tended to decrease. A second group of fish (29 to 1510.0 g, n = 34) was used for the evaluation of allometric relationships concerning ventilation and dimensions of the buccal and opercular cavities. At maximum Vg, the VT corresponded to 93.2 +/- 2.4% of the buccal volume and 94.9 2.3% of the opercular volume, suggesting that the Vg of P. mesopotamicus is limited by the volumes of buccal and opercular cavities in severe hypoxia.
Kalinin; Severi; Guerra; Costa; Rantin
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Publication Detail:
Journal Detail:
Title:  Revista brasileira de biologia     Volume:  60     ISSN:  0034-7108     ISO Abbreviation:  Rev Bras Biol     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-08-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985055R     Medline TA:  Rev Bras Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  249-254     Citation Subset:  -    
Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, São Carlos, SP, 13565-905, Brazil.
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