A comparison of constant acceleration swimming speeds when acceleration rates are different with critical swimming speeds in Chinese bream under two oxygen tensions

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• 作者：Jian-Wei Wang ; Zhen-Dong Cao ; Shi-Jian Fu
• 关键词：Swimming speed ; Biochemical indicators ; Oxygen tension ; Chinese bream ; Swimming protocol
• 刊名：Fish Physiology and Biochemistry
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：42
• 期：5
• 页码：1453-1461
• 全文大小：483 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  Animal Physiology
  Animal Anatomy, Morphology and Histology
  Animal Biochemistry
  Zoology
  
• 出版者：Springer Netherlands
• ISSN：1573-5168
• 卷排序：42

文摘

To investigate the effect of acceleration rates on the constant acceleration test speed (U_cat) and to compare U_cat with the critical swimming speed (U_crit) in Chinese bream (Parabramis pekinensis), the U_cat test at acceleration rates of 0.05, 0.1, 0.2, 0.4 and 0.8 cm s−2 and the U_crit test in juvenile fish at 20 °C in either normoxia (>90 % saturation oxygen tension) or hypoxia (30 % saturation) were compared. The lactate concentration ([lactate]) of white muscle, liver and plasma and the glycogen concentration ([glycogen]) of white muscle and liver were also measured to identify whether tissue substrate depletion or tissue lactate accumulation correlated with exhaustion. The U_cat decreased with the acceleration rate, and there was no significant difference between U_crit and U_cat at lower acceleration rates. Hypoxia resulted in lower U_cat and U_crit, and the difference increased with decreased acceleration rates of the U_cat test, possibly due to the increased contribution of aerobic components in U_crit or U_cat at low acceleration rates. Hypoxia elicited a significant decrease in muscle [glycogen] and an increase in muscle and liver [lactate] in resting fish. All post-exercise fish had similar muscle [lactate], suggesting that tissue lactate accumulation may correlate with exercise exhaustion. Unlike hypoxia, exercise induced an increase in muscle [lactate] and a significant increase in plasma [lactate], which were worthy of further investigation. The similar swimming speed and biochemical indicators after exercise in the U_crit and U_cat groups at low acceleration rates suggested that U_cat can be an alternative for the more frequently adopted protocols in U_crit in Chinese bream and possibly in other cyprinid fish species.