Title
Cortisol emphasizes the metabolic strategies employed by common carp, **Cyprinus carpio** at different feeding and swimming regimes Cortisol emphasizes the metabolic strategies employed by common carp, **Cyprinus carpio** at different feeding and swimming regimes
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
166(2013) :3 , p. 449-464
ISSN
1095-6433
ISI
000325121900007
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The objective of this study was to investigate the interaction between feeding, exercise and cortisol on metabolic strategies of common carp over a 168 h post-implant period. Feeding provided readily available energy and clearly increased muscle and liver protein and glycogen stores. Swimming, feeding and cortisol all induced aerobic metabolism by increasing oxygen consumption, and stimulated protein metabolism as demonstrated by the increased ammonia and urea excretion and ammonia quotient. Hypercortisol stimulated ammonia self-detoxifying mechanisms by enhancing ammonia and urea excretion, especially during severe exercise. At high swimming level, higher branchial clearance rates in cortisol treated fish succeeded in eliminating the elevation of endogenous ammonia, resulting in reduced plasma Tamm levels compared to control and sham implanted fish. Carp easily induced anaerobic metabolism, both during routine and active swimming, with elevated lactate levels as a consequence. Both feeding and cortisol treatment increased this dependence on anaerobic metabolism. Hypercortisol induced both glycogenesis and gluconeogenesis resulting in hyperglycemia and muscle and liver glycogen deposition, most likely as a protective mechanism for prolonged stress situations and primarily fuelled by protein mobilization.
E-info
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