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| Response of Oxidative Stress Indicators in Liver and Muscle of Mullet Liza haematocheila to Variation in Dissolved Oxygen Levels |
| LIU Xu-jia,HUANG Guo-qiang,LI Jie,TANG Xia |
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Abstract The changes in oxidative stress indicators were studied in liver and muscle of the juvenile mullet Liza haematocheila under four patterns of dissolved oxygen levels .The results showed that the variation in oxidative stress indicators was consistent and rhythmical in liver ,lower than in muscle in the pattern nearly constantly saturated with dissolved oxygen .Most of the oxidative stress indicators were found to be increased significantly in liver in the pattern from nearly saturated to the minimum value of dissolved oxy‐gen ,but the opposite case in the muscle .There was significantly difference in rhythm of the oxidative stress indicators in liver under the pattern from nearly saturated ,super‐saturated ,and nearly saturated to minimum value of dissolved oxygen compared with that in the pattern of saturated dissolved oxygen .How‐ever ,the level of the oxidative stress indicators was found to be increased on the next day when the content of the dissolved oxygen was reduced to 1 .0 mg/L .In the pattern from over‐saturation ,nearly saturation to recovery from nearly saturation ,the content of oxidative stress indicators in muscle was declined sharply compared to the pattern of nearly saturated dissolved oxygen ,with the consistent change in rhythm with the content of dissolved oxygen .The maximal value of T‐AOC was observed in the supersaturated period , and the maximal SOD and T‐SOD activities in liver were found in the 24 h recovery stage after the nearly saturated period .In the muscle ,however ,the maximum value of all the oxidative stress indicators was ob‐served in the recovery stage .The findings indicated that the oxidative stress indicators in different pattern showed different dissolved oxygen contents and rhythm compared to the normal dissolved oxygen condi‐tion .T he mullet had positive response to the variation in dissolved oxygen patterns and maintained antiox‐idant substance during the lower dissolved oxygen level period .
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Received: 25 June 2014
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