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Common carp, Cyprinus carpio, prefer branchial ionoregulation at high feeding rates and kidney ionoregulation when food supply is limited: additional effects of cortisol and exercise

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Abstract

This study aims to examine ionoregulatory parameters during exercise and cortisol elevation in common carp fed different food rations. Fish subjected to two different feeding regimes (0.5 or 3.0% body mass (BM) daily) received no implant or an intraperitoneal cortisol implant (250 mg/kg BM) or sham, and were monitored over a 168-h post-implant (PI) period under resting, low aerobic swimming or exhaustive swimming conditions. Plasma osmolality was maintained at relatively stable levels without much influence of feeding, swimming or cortisol, especially in low feeding groups. Nevertheless, a transient hyponatremia was observed in all low feeding fish implanted with cortisol. The hyponatremia was more pronounced in fish swum to exhaustion but even in this group, Na+ levels returned to control levels as cortisol levels recovered (168 h-PI). Cortisol-implanted fish also had lower plasma Cl levels, and this loss of plasma Cl was more prominent in fish fed a high ration during exhaustive swimming (recovered at 168 h-PI). Cortisol stimulated branchial NKA and H+ ATPase activities, especially in high ration fish. In contrast, low ration fish upregulated kidney NKA and H+ ATPase activities when experiencing elevated levels of cortisol. In conclusion, low feeding fish experience an ionoregulatory disturbance in response to cortisol implantation especially when swum to exhaustion in contrast to high feeding fish.

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Acknowledgements

The authors would like to thank Joosen S, Meas N and Van Den Bergh K for their technical assistance. The authors also would like to thank Wilson JM and Alsop D for their valuable comments and time in editing the final version of the manuscript.

Funding

This study was financially supported by Bijzonder Onderzoeksfonds (BOF-IWS) research grant to De Boeck G. Liew HJ’s scholarship was funded by the Malaysian Ministry of Higher Education and Universiti Malaysia Terengganu (UMT). Chiarella D was an Erasmus scholar funded by the Erasmus Placement Program.

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Correspondence to Hon Jung Liew.

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All experimental procedures were approved by the University of Antwerp Animal Care Committee according to the guidelines of the Federation of European Laboratory Animal Science Associations.

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Liew, H.J., Pelle, A., Chiarella, D. et al. Common carp, Cyprinus carpio, prefer branchial ionoregulation at high feeding rates and kidney ionoregulation when food supply is limited: additional effects of cortisol and exercise. Fish Physiol Biochem 46, 451–469 (2020). https://doi.org/10.1007/s10695-019-00736-0

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  • DOI: https://doi.org/10.1007/s10695-019-00736-0

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