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In the present study, the effect of air exposure on the antioxidant activities ofLitopenaeus vannamei was studied.The behavioral changes in shrimp and the levels of superoxide dismutase (SOD), malondialdehyde (MDA) and total antioxidant competence (T-AOC) in the muscles and the hepatopancreas of the shrimp were determined after they were exposed to air and then resubmersed in water.Results showed that the duration of air exposure significantly influenced the survival ofL.vannamei (P < 0.05).The maximum exposure time of shrimp in air was 30 min at which the shrimp could remain alive.After 10 min of air exposure, shrimp could survive when they were resubmersed in water.The T-AOC in the hepatopancreas and muscles of the shrimp exposed to air for 20 min was decreased significantly (P < 0.05).The MDA content in the hepatopancreas of shrimp exposed to air for 20, 30, and 40 min were significantly higher than that in the hepatopancreas of the control group(P < 0.05).During the resubmersion period,the MDA content in the hepatopancreas and the muscles of shrimp increased.The SOD activities in the hepatopancreas and muscles were restored when the shrimp were resubmersed in water for 3 h after these shrimp were exposed to air for 10 min.Our results indicated that air exposure could cause oxidative damage to L.vannamei, but this damage could be reversed when shrimp were resubmersed in water.