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Excess post-hypoxic oxygen consumption is independent from lactate accumulation in two cyprinid fishes

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Authors:
  • Genz, J. ;
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    University of Manitoba
  • Jyde, M.B. ;
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    Roskilde University
  • Svendsen, Jon Christian ;
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    Orcid logo0000-0002-0273-0985
    National Institute of Aquatic Resources, Technical University of Denmark
  • Steffensen, J.F. ;
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    University of Copenhagen
  • Ramløv, H.
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    Roskilde University
DOI:
10.1016/j.cbpa.2013.02.002
Abstract:
Carassius carassius responds to hypoxic conditions by conversion of lactate into ethanol, which is excreted over the gills. However, a closely related species, Cyprinus carpio, does not possess the ability to produce ethanol and would be expected to accumulate lactate during hypoxic exposure. While the increase in oxygen consumption in fish required following strenuous exercise or low environmental oxygen availability has been frequently considered, the primary contributing mechanism remains unknown. This study utilized the close relationship but strongly divergent physiology between C. carpio and C. carassius to examine the possible correlation between excess post-hypoxic oxygen consumption (EPHOC) and lactate accumulation. No difference in the EPHOC:O2 deficit ratio was observed between the two species after 2.5 h anoxia, with ratios of 2.0 ± 0.6 (C. carpio) and 1.3 ± 0.3 (C. carassius). As predicted, lactate accumulation dynamics did significantly differ between the species in both plasma and white muscle following anoxic exposure. Significant lactate accumulation was seen in both plasma and muscle in C. carpio, but there was no accumulation of lactate in white muscle tissue of C. carassius. These findings indicate that lactate accumulated as a consequence of 2.5 h anoxic exposure is not a major determinant of the resulting EPHOC
Type:
Journal article
Language:
English
Published in:
Comparative Biochemistry and Physiology. Part A: Molecular and Integrative Physiology, 2013, Vol 165, Issue 1, p. 54-60
Keywords:
Common carp; Crucian carp; Anoxia; Anaerobic metabolism; lactate cyprinid fish
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2013
Scientific Level:
Scientific
ID:
239871408

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