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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2012, Vol. 13 Issue (10): 791-796    DOI: 10.1631/jzus.B1200022
Articles     
Effects of total dissolved gas supersaturated water on lethality and catalase activity of Chinese sucker (Myxocyprinus asiaticus Bleeker)
Shi-chao Chen, Xiao-qing Liu, Wen Jiang, Ke-feng Li, Jun Du, Dan-zhou Shen, Quan Gong
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China; School of Energy and Environment, Xihua University, Chengdu 610039, China; Fisheries Institute, Sichuan Academy of Agricultural Sciences, Chengdu 611731, China
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Abstract  Total dissolved gas (TDG) supersaturation caused by dam sluicing can result in gas bubble trauma (GBT) in fish and threaten their survival. In the present study, Chinese suckers (Myxocyprinus asiaticus Bleeker) were exposed to TDG supersaturated water at levels ranging from 120% to 145% for 48 h. The median lethal concentration (LC50) and the median lethal time (LT50) were determined to evaluate acute lethal effects on Chinese suckers. The results showed that the LC50 values of 4, 6, 8, and 10 h were 142%, 137%, 135%, and 130%, respectively. The LT50 values were 3.2, 4.7, 7.8, 9.2, and 43.4 h, respectively, when TDG supersaturated levels were 145%, 140%, 135%, 130%, and 125%. Furthermore, the biological responses in Chinese suckers were studied by assaying the catalase (CAT) activities in gills and muscles at the supersaturation level of 140% within LT50. The CAT activities in the gills and muscle tissues exhibited a regularity of a decrease after an increase. CAT activities in the muscles were increased significantly at 3/5LT50 (P<0.05) and then came back to the normal level. However, there were no significant differences between the treatment group (TDG level of 140%) and the control group (TDG level of 100%) on CAT activities in the gills before 3/5LT50 (P>0.05), but the activities were significantly lower than the normal level at 4/5LT50 and LT50 (P<0.05).

Key words： Total dissolved gas supersaturation      Median lethal time (LT50)      Median lethal concentration (LC50)      Chinese sucker      Catalase     
Received: 16 January 2012      Published: 29 June 2012
CLC:  Q17  
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Shi-chao Chen
Xiao-qing Liu
Wen Jiang
Ke-feng Li
Jun Du
Dan-zhou Shen
Quan Gong
Cite this article:

Shi-chao Chen, Xiao-qing Liu, Wen Jiang, Ke-feng Li, Jun Du, Dan-zhou Shen, Quan Gong. Effects of total dissolved gas supersaturated water on lethality and catalase activity of Chinese sucker (Myxocyprinus asiaticus Bleeker). Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2012, 13(10): 791-796.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B1200022     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2012/V13/I10/791

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