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Metabolic adjustments in the common carp during prolonged hypoxia
Author(s) -
Zhou B. S.,
Wu R. S. S.,
Randall D. J.,
Lam P. K. S.,
Ip Y. K.,
Chew S. F.
Publication year - 2000
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2000.tb00478.x
Subject(s) - biology , carp , phosphofructokinase , medicine , glycogen , hypoxia (environmental) , endocrinology , cytochrome c oxidase , cyprinus , citrate synthase , lactate dehydrogenase , glycolysis , common carp , pyruvate kinase , oxygen , biochemistry , metabolism , enzyme , fish <actinopterygii> , fishery , chemistry , organic chemistry
Biochemical and respiratory changes in the common carp Cyprinus carpio , were studied 6, 24, 96 and 168 h upon exposure to hypoxia (0·5 mgO 2 l −1 ). Modification of kinetic properties of phosphofructokinase (PFK‐1), coupled with a decreased in PFK‐1 activities, were evident in muscle. No changes in kinetics and activities could be observed in muscle pyruvate kinase (PK) and lactate dehydrogenase (LDH). A decrease in muscle citrate synthase (CS) and an increase in muscle cytochrome c oxidase (CCO) were found. The common carp was able to maintain a constant level of muscle glycogen, muscle ATP, and liver CS throughout the 168‐h experimental period. Changes in activities of liver LDH and muscle CCO were observed only at 168 h, which indicates that common carp may switch to alternative metabolic pathway to deal with prolonged hypoxia. A severe decrease in liver glycogen was accompanied by increases in lactate levels in both the muscle and liver. Oxygen consumption rate was reduced under hypoxia, but resumed to normoxic levels within 2 h upon return to normoxic condition. Overall, these results indicate that carp adopt different strategies in an attempt to deal with short term and long term hypoxia in the natural environment.