Title
Feeding and swimming modulate iono-and-hormonal regulation differently in goldfish, **Carassius auratus** and common carp, **Cyprinus carpio** Feeding and swimming modulate iono-and-hormonal regulation differently in goldfish, **Carassius auratus** and common carp, **Cyprinus carpio**
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London ,
Subject
Chemistry
Biology
Human medicine
Source (journal)
Comparative biochemistry and physiology : A : molecular & integrative physiology. - London
Volume/pages
165(2013) :1 , p. 13-21
ISSN
1095-6433
ISI
000317638000003
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Feeding and swimming can influence ion balance in fish. Therefore we investigated their impact on ionoregulation and its hormonal control in goldfish and common carp. As expected due to the osmorespiratory compromise, exhaustive swimming induced increases in gill Na+/K+ ATPase (NKA) activity in both species, resulting in stable levels of plasma ions. In contrast to our expectations, this only occurred in fed fish and feeding itself increased NKA activity, especially in carp. Fasting fish were able to maintain ion balance without increasing NKA activity, we propose that the increase in NKA activity is related to ammonia excretion rather than ion uptake per se. In goldfish, this increase in NKA activity coincided with a cortisol elevation whilst no significant change was found in carp. In goldfish, high conversion of plasma T4 to T3 was found in both fed and fasted fish resulting in low T4/T3 ratios, which increased slightly due to exhaustive swimming. In starved carp the conversion seemed much less efficient, and high T4/T3 ratios were observed. We propose that thyroid hormone regulation in carp was more related to its role in energy metabolism rather than ionoregulation. The present research showed that both species, whether fed or fasted, are able to sufficiently adapt their osmorepiratory strategy to minimise ions losses whilst maintaining gas exchange under exhaustive swimming.
E-info
https://repository.uantwerpen.be/docman/iruaauth/89dc8c/6625b36dd47.pdf
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