The role of branchial and orobranchial O2 chemoreceptors in the control of aquatic surface respiration in the neotropical fish tambaqui (Colossoma macropomum): progressive responses to prolonged hypoxia

The Journal of Experimental Biology
L H FlorindoF T Rantin

Abstract

The present study examined the role of branchial and orobranchial O(2) chemoreceptors in the cardiorespiratory responses, aquatic surface respiration (ASR), and the development of inferior lip swelling in tambaqui during prolonged (6 h) exposure to hypoxia. Intact fish (control) and three groups of denervated fish (bilateral denervation of cranial nerves IX+X (to the gills), of cranial nerves V+VII (to the orobranchial cavity) or of cranial nerves V alone), were exposed to severe hypoxia (Pw(O)2=10 mmHg) for 360 min. Respiratory frequency (fr) and heart rate (fh) were recorded simultaneously with ASR. Intact (control) fish increased fr, ventilation amplitude (V(AMP)) and developed hypoxic bradycardia in the first 60 min of hypoxia. The bradycardia, however, abated progressively and had returned to normoxic levels by the last hour of exposure to hypoxia. The changes in respiratory frequency and the hypoxic bradycardia were eliminated by denervation of cranial nerves IX and X but were not affected by denervation of cranial nerves V or V+VII. The V(AMP) was not abolished by the various denervation protocols. The fh in fish with denervation of cranial nerves V or V+VII, however, did not recover to control values as in intact fish. ...Continue Reading

References

Mar 27, 2004·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·S F PerryF T Rantin
Jan 1, 1990·Fish Physiology and Biochemistry·R Fritsche

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Citations

Aug 8, 2007·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·C A C LeiteF T Rantin
Feb 12, 2011·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Cosima PorteusWilliam K Milsom
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Jun 30, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Mariana A Micheli-CampbellFrancisco T Rantin
Sep 15, 2014·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Michael G JonzAnna S Mierzwa
May 9, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Vivian M ZeraikF Tadeu Rantin
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