THE EFFECTS OF DISSOLVED OXYGEN LEVELS ON RESTING OXYGEN CONSUMPTION AND SWIMMING PERFORMANCE IN JUVENILE DARKBARBEL CATFISH PELTEBAGRUS VACHELLI

PANG Xu; YUAN Xing-Zhong; CAO Zhen-Dong; FU Shi-Jian

doi:10.3724/SP.J.1035.2012.00255

Volume 36 Issue 2

Mar. 2014

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ACTA HYDROBIOLOGICA SINICA > 2012 > 36(2): 255-261. > DOI: 10.3724/SP.J.1035.2012.00255

PANG Xu, YUAN Xing-Zhong, CAO Zhen-Dong, FU Shi-Jian. THE EFFECTS OF DISSOLVED OXYGEN LEVELS ON RESTING OXYGEN CONSUMPTION AND SWIMMING PERFORMANCE IN JUVENILE DARKBARBEL CATFISH PELTEBAGRUS VACHELLI[J]. ACTA HYDROBIOLOGICA SINICA, 2012, 36(2): 255-261. DOI: 10.3724/SP.J.1035.2012.00255

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THE EFFECTS OF DISSOLVED OXYGEN LEVELS ON RESTING OXYGEN CONSUMPTION AND SWIMMING PERFORMANCE IN JUVENILE DARKBARBEL CATFISH PELTEBAGRUS VACHELLI

Laboratory of Evolutionary Physiology and Behaviour, Chongqing Key Laboratory of Animal Biology, Chongqing Normal University, Chongqing 400047, China;
2. College of Resource and Environment Science, Chongqing University, Chongqing 400030, China

Received Date: October 24, 2010
Rev Recd Date: September 22, 2011
Published Date: March 24, 2012

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Abstract

To test the swimming performance, locomotive limiting factors and metabolic adaptive strategy of darkbarbel catfish Peltebagrus vachelli under different dissolved oxygen levels (DO), the effects of DO (125%, 100%, 75%, 50% and 25% air saturation) on resting oxygen consumption rate (MO2), critical swimming speed (Ucrit) and MO2 at different swimming speeds up to Ucrit were investigated in juvenile darkbarbel catfish at 25oC. Resting MO2 decreased significantly with DO (P2]crit) for resting MO2 was 14.52% air saturation (1.16 mg/L). The active MO2 decreased significantly with the decrease of DO from 100% to 25% air saturation (PUcrit decreased significantly when DO fell below 75% air saturation (PUcrit nor active MO2 showed any elevation under hyperoxic conditions (125% air saturation); and the cost of transport (COT) was significantly lower under 25% air saturation than that of other groups at corresponding swimming speeds (P<0.05). These results suggested that the swimming performance of darkbarbel catfish was limited by the cardio-respiratory system under hypoxia, while it was limited by the peripheral locomotory organs and musculature under normoxia.
- Dissolved oxygen level,
- Peltebagrus vachelli,
- Metabolic response,
- Swimming performance

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THE EFFECTS OF DISSOLVED OXYGEN LEVELS ON RESTING OXYGEN CONSUMPTION AND SWIMMING PERFORMANCE IN JUVENILE DARKBARBEL CATFISH PELTEBAGRUS VACHELLI

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