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| KALININ,A. L.; SEVERI,W.; GUERRA,C. D. R.; COSTA,M. J.; RANTIN,F. T.. |
| Ventilation volume (<img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif" alt="a08vg.gif (265 bytes)" align="absmiddle"> mlH2O.min1 ), respiratory frequency (fR breaths.min1) and tidal volume (V T mlH2O.breath1 ) 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.min1, 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.min1) at 10 mmHg. The V T rose from 1.8 ± 0.1 to 6.0 ± 0.5 and 5.7 ± 0.4 mlH2O. breath1 in the PiO2 of 16 and 10 mmHg, respectively. The <img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif"... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoxia; Normoxia; Ventilatory parameters; Buccal and opercular volumes; Piaractus mesopotamicus. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200008 |
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| SEVERI,W.; RANTIN,F. T.; FERNANDES,M. N.. |
| The pacu Piaractus mesopotamicus (Holmberg, 1887), is a commercially important serrasalmid fish endemic to the Paraná-Paraguay River basin, and one of the most widely cultivated native fish species in the Neotropics. As a migratory species, also inhabiting temporary pools subjected to hypoxic conditions, the species presents a high plasticity concerning respiratory adaptations. In order to supplement basic knowledge on the respiratory physiology and morphology of this species, some structural features of pacu gills, such as filament and lamellae structure, and circulatory pattern are described in this paper. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gill structure; Gill morphology; Pacu; Piaractus mesopotamicus. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300014 |
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