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Stress-induced changes of plasma antioxidants in aquacultured sea bass, Dicentrarchus labrax

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, ISSN: 1095-6433, Vol: 132, Issue: 1, Page: 205-211
2002
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Article Description

Antioxidant plasma activities of ascorbate, α-tocopherol and glutathione peroxidase were analysed in adult male sea bass, Dicentrarchus labrax, in normal conditions and after hypoxia-recovery. In addition, tank measurements of temperature, pH, salinity and chlorine changes were carried out. Ascorbate and α-tocopherol were measured using a high-pressure liquid chromatography method and glutathione peroxidase activity enzymatically. Ascorbate and α-tocopherol showed a relationship with the velocity of body growing in normal and hypoxia-recovery conditions. In sea bass exposed to hypoxia, only ascorbate and α-tocopherol levels were significantly lower compared with the control group. Slope study and expression percent of antioxidants reduction after stress conditions revealed a predominant role of plasma α-tocopherol. Sea bass subjected to variations of salinity and chlorine showed a significant decrease in plasma α-tocopherol. A relationship could be suggested between antioxidant defence and fish response in aquaculture.

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