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Postprandial cardiorespiratory responses and the regulation of digestion-associated tachycardia in Nile tilapia (Oreochromis niloticus)

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Abstract

Cardiorespiratory adjustments that occur after feeding are essential to supply the demands of digestion in vertebrates. The well-documented postprandial tachycardia is triggered by an increase in adrenergic activity and by non-adrenergic non-cholinergic (NANC) factors in mammals and crocodilians, while it is linked to a withdrawal of vagal drive and NANC factors in non-crocodilian ectotherms—except for fish, in which the sole investigation available indicated no participation of NANC factors. On the other hand, postprandial ventilatory adjustments vary widely among air-breathing vertebrates, with different species exhibiting hyperventilation, hypoventilation, or even no changes at all. Regarding fish, which live in an environment with low oxygen capacitance that requires great ventilatory effort for oxygen uptake, data on the ventilatory consequences of feeding are also scarce. Thus, the present study sought to investigate the postprandial cardiorespiratory adjustments and the mediation of digestion-associated tachycardia in the unimodal water-breathing teleost Oreochromis niloticus. Heart rate (fH), cardiac autonomic tones, ventilation rate (fV), ventilation amplitude, total ventilation and fH/fV variability were assessed both in fasting and digesting animals under untreated condition, as well as after muscarinic cholinergic blockade with atropine and double autonomic blockade with atropine and propranolol. The results revealed that digestion was associated with marked tachycardia in O. niloticus, determined by a reduction in cardiac parasympathetic activity and by circulating NANC factors—the first time such positive chronotropes were detected in digesting fish. Unexpectedly, postprandial ventilatory alterations were not observed, although digestion triggered mechanisms that were presumed to increase oxygen uptake, such as cardiorespiratory synchrony.

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All data are available at https://doi.org/10.17605/OSF.IO/W685M.

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Acknowledgements

The authors would like to thank the INCT—FISC professors for their comments and suggestions on the present study, as well as the members of Florindo’s Laboratory for the assistance with animal care.

Funding

This study was supported by the Brazilian National Council for Scientific and Technological Development (CNPq) and the São Paulo Research Foundation (FAPESP), through the Brazilian National Institute of Science and Technology in Comparative Physiology (INCT—FISC; Proc. Number 2008/57712-4). ING also received an undergraduate research fellowship from FAPESP (Proc. Number 2017/01616-6).

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Authors and Affiliations

  1. Department of Zoology and Botany, Institute of Biosciences, Languages and Exact Sciences, São Paulo State University (UNESP), Rua Cristóvão Colombo, 2265, São José do Rio Preto, SP, 15054-000, Brazil

    Igor Noll Guagnoni, Vinicius Araújo Armelin, Victor Hugo da Silva Braga & Luiz Henrique Florindo

  2. Department of Physiology, Institute of Biosciences, University of São Paulo (USP), Rua do Matão, Travessa 14, 321, São Paulo, SP, 05508-090, Brazil

    Vinicius Araújo Armelin

  3. Department of Physiological Sciences, Federal University of São Carlos (UFSCar), Rodovia Washington Luiz, km 235, São Carlos, SP, 13565‑905, Brazil

    Francisco Tadeu Rantin

  4. Aquaculture Center (CAUNESP), São Paulo State University (UNESP), Rodovia Prof. Paulo Donato Castellane, n/n, Jaboticabal, SP, 14884-900, Brazil

    Luiz Henrique Florindo

  5. National Institute of Science and Technology in Comparative Physiology (INCT, FAPESP/CNPq), São Paulo, Brazil

    Igor Noll Guagnoni, Vinicius Araújo Armelin, Victor Hugo da Silva Braga, Francisco Tadeu Rantin & Luiz Henrique Florindo

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  1. Igor Noll Guagnoni
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Correspondence to Luiz Henrique Florindo.

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The experiments conducted in the present study were approved by the UNESP/IBILCE Ethics Committee for Animal Research (Proc. 166/2017 CEUA), being in accordance with all the regulations and ethical guidelines in Brazil.

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Guagnoni, I.N., Armelin, V.A., da Silva Braga, V.H. et al. Postprandial cardiorespiratory responses and the regulation of digestion-associated tachycardia in Nile tilapia (Oreochromis niloticus). J Comp Physiol B 191, 55–67 (2021). https://doi.org/10.1007/s00360-020-01317-x

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