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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Branchial O-2 chemoreceptors in Nile tilapia Oreochromis niloticus: Control of cardiorespiratory function in response to hypoxia

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Author(s):
Zeraik, Vivian M. [1] ; Belao, Thiago C. [1] ; Florindo, Luiz Henrique [2] ; Kalinin, Ana L. [1] ; Tadeu Rantin, F. [1]
Total Authors: 5
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, Dept Physiol Sci, Lab Zoophysiol & Comparat Biochem, BR-13565905 Sao Carlos, SP - Brazil
[2] Sao Paulo State Univ UNESP IBILCE, Dept Bot & Zool, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY; v. 166, n. 1, p. 17-25, SEP 2013.
Web of Science Citations: 5
Abstract

This study examined the distribution and orientation of gill O-2 chemoreceptors in Oreochromis niloticus and their role in cardiorespiratory responses to graded hypoxia. Intact fish, and a group with the first gill arch excised (operated), were submitted to graded hypoxia and their cardiorespiratory responses (oxygen uptake - (V) over dotO(2), breathing frequency - f(R), ventilatory stroke volume - V-T, gill ventilation - (V) over dot(G), O-2 extraction from the ventilatory current - EO2, and heart rate - f(H)) were compared. Their responses to bolus injections of NaCN into the bloodstream (internal) or ventilatory water stream (external) were also determined. The (V) over dotO(2) of operated fish was significantly lower at the deepest levels of hypoxia. Neither reflex bradycardia nor ventilatory responses were completely abolished by bilateral excision of the first gill arch. EO2 of the operated group was consistently lower than the intact group. The responses to internal and external NaCN included transient decreases in f(H) and increases in f(R) and V-amp (ventilation amplitude). These cardiorespiratory responses were attenuated but not abolished in the operated group, indicating that chemoreceptors are not restricted to the first gill arch, and are sensitive to oxygen levels in both blood and water. (c) 2013 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 10/03599-2 - Location, distribution and orientation of the branchial O2 chemoreceptors in tilapia from Nilo (Oreochromis niloticus): Control of cardiorespiratory responses to hypoxia
Grantee:Vivian Maria Zeraik
Support Opportunities: Scholarships in Brazil - Master