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Respiratory response of grass carp Ctenopharyngodon idellus to dissolved oxygen changes at three acclimation temperatures

文献类型： 外文期刊

作者： Zhao, Zhigang 1 ; Dong, Shuanglin 2 ; Xu, Qiyou 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, Harbin 150070, Heilongjiang, Peoples R China

2.Ocean Univ China, Key Lab Mariculture, Minist Educ, Qingdao 266003, Peoples R China

关键词： Grass carp;Ctenopharyngodon idellus;Dissolved oxygen levels;Hypoxia;Respiratory response

期刊名称：FISH PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：2.794； 五年影响因子：2.876 ）

ISSN： 0920-1742

年卷期： 2018 年 44 卷 1 期

页码：

收录情况： SCI

摘要： Respiratory parameters of grass carp were studied during dissolved oxygen (DO) changes from normal DO to hypoxia, then return to normal DO at 15, 25, and 30 A degrees C acclimation, respectively. The results showed that with increases of acclimation temperature at normoxia the respiratory frequency (f(R)), oxygen consumption rate (VO2), respiratory stroke volume (V-S.R), gill ventilation (V-G), and V-G/VO2 of grass carp increased significantly, but the oxygen extraction efficiency (EO2) of fish decreased significantly (P < 0.05). With declines of DO levels, the f(R), V-S.R, V-G, and V-G/VO2 of fish increased significantly at different acclimation temperatures (P < 0.05). A slight increase was found in VO2, and the EO2 of fish remained almost constant above DO levels of 3.09, 2.91, and 2.54 mg l(-1) at 15, 25, and 30 A degrees C, while the VO2 and EO2 began to decrease significantly with further reductions in DO levels (P < 0.05). After 0.5 h of recovery to normoxia from hypoxia at three acclimation, the f(R), V-S.R, V-G, and V-G/VO2 of the fish decreased sharply; meanwhile, the VO2 and EO2 increased sharply (P < 0.05). The respiratory parameters of fish gradually approached initial values with prolonged recovery time to normoxia, and reached their initial values in 2.5 h at 25 and 30 A degrees C acclimation. The critical oxygen concentrations (C-c) of fish for VO2 were 2.42 mg l(-1) at 15 A degrees C, 2.02 mg l(-1) at 25 A degrees C, and 1.84 mg l(-1) at 30 A degrees C, respectively. The results suggest that grass carp are highly adapted to varied DO and short-term hypoxia environments.

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