Title
Fasting goldfish, **Carassius auratus**, and common carp, **Cyprinus carpio**, use different metabolic strategies when swimming Fasting goldfish, **Carassius auratus**, and common carp, **Cyprinus carpio**, use different metabolic strategies when swimming
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
163(2012) :3/4 , p. 327-335
ISSN
1095-6433
ISI
000309784400013
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Fish need to balance their energy use between digestion and other activities, and different metabolic compromises can be pursued. We examined the effects of fasting (7 days) on metabolic strategies in goldfish and common carp at different swimming levels. Fasting had no significant effect on swimming performance (Ucrit) of either species. Feeding and swimming profoundly elevated total ammonia (Tamm) excretion in both species. In fed goldfish, this resulted in increased ammonia quotients (AQ), and additionally plasma and tissue ammonia levels increased with swimming reflecting the importance of protein contribution for aerobic metabolism. In carp, AQ did not change since oxygen consumption (MO2) and Tamm excretion followed the same trend. Plasma ammonia did not increase with swimming suggesting a balance between production and excretion rate except for fasted carp at Ucrit. While both species relied on anaerobic metabolism during exhaustive swimming, carp also showed increased lactate levels during routine swimming. Fasting almost completely depleted glycogen stores in carp, but not in goldfish. Both species used liver protein for basal metabolism during fasting and muscle lipid during swimming. In goldfish, feeding metabolism was sacrificed to support swimming metabolism with similar MO2 and Ucrit between fasted and fed fish, whereas in common carp feeding increased MO2 at Ucrit to sustain feeding and swimming independently.
E-info
https://repository.uantwerpen.be/docman/iruaauth/43ee79/2aaa6651829.pdf
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