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Fish Physiology and Biochemistry

, Volume 36, Issue 4, pp 1243–1252 | Cite as

Effect of temperature on excess post-exercise oxygen consumption in juvenile southern catfish (Silurus meridionalis Chen) following exhaustive exercise

  • Ling-Qing Zeng
  • Yao-Guang Zhang
  • Zhen-Dong CaoEmail author
  • Shi-Jian Fu
Article

Abstract

The effects of temperature on resting oxygen consumption rate (MO2rest) and excess post-exercise oxygen consumption (EPOC) after exhaustive exercise (chasing) were measured in juvenile southern catfish (Silurus meridionalis) (8.40 ± 0.30 g, n = 40) to test whether temperature has a significant influence on MO2rest, maximum post-exercise oxygen consumption rate (MO2peak) and EPOC and to investigate how metabolic scope (MS: MO2peak − MO2rest) varies with acclimation temperature. The MO2rest increased from 64.7 (10°C) to 160.3 mg O2 h−1 kg−1 (25°C) (P < 0.05) and reached a plateau between 25 and 30°C. The post-exercise MO2 in all temperature groups increased immediately to the peak values and then decreased slowly to a steady state that was higher than the pre-exercise MO2. The MO2peak did not significantly differ among the 20, 25 and 30°C groups, though these values were much higher than those of the lower temperature groups (10 and 15°C) (P < 0.05). The duration of EPOC varied from 32.9 min at 10°C to 345 min at 20°C, depending on the acclimation temperatures. The MS values of the lower temperature groups (10 and 15°C) were significantly smaller than those of the higher temperature groups (20, 25 and 30°C) (P < 0.05). The magnitude of EPOC varied ninefold among all of the temperature groups and was the largest for the 20°C temperature group (about 422.4 mg O2 kg−1). These results suggested that (1) the acclimation temperature had a significant effect on maintenance metabolism (as indicated by MO2rest) and the post-exercise metabolic recovery process (as indicated by MO2peak, duration and magnitude of EPOC), and (2) the change of the MS as a function of acclimation temperature in juvenile southern catfish might be related to their high degree of physiological flexibility, which allows them to adapt to changes in environmental conditions in their habitat in the Yangtze River and the Jialing River.

Keywords

Temperature Exhaustive exercise Excess post-exercise oxygen consumption (EPOC) Metabolic scope Recovery Silurus meridionalis 

Abbreviations

MO2

Oxygen consumption rate

MO2rest

Resting oxygen consumption rate

MO2peak

Peak post-exercise oxygen consumption rate

EPOC

Excess post-exercise oxygen consumption

MS

Metabolic scope

ATP

Adenosine triphosphate

PCr

Phosphocreatine

Ucrit

Critical swimming speed

ANOVA

One-way analysis of variance

LSD

Least significant difference

Notes

Acknowledgments

We are very grateful to post-graduates X. M. Li, K. G. Li, Y. P. Chen, and X. Pang for their assistance in conducting experiments and fish husbandry. We also thank Mrs. J. L. Peng for her kind help in the present study. This study was funded by the National Science Foundation of China (NSFC 30700087) grant to S.J.F. and the Research Project of Chongqing Education Committee (KJ080823) granted to Z.D.C.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Ling-Qing Zeng
    • 1
    • 2
  • Yao-Guang Zhang
    • 2
  • Zhen-Dong Cao
    • 1
    Email author
  • Shi-Jian Fu
    • 1
  1. 1.Laboratory of Evolutionary Physiology and BehaviorChongqing Normal UniversityChongqingChina
  2. 2.Key Laboratory of Freshwater Fish Reproduction and Development, Education of MinistrySouthwest UniversityChongqingChina

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