Changes in the fatty acid composition and regulation of antioxidant enzymes and physiology of juvenile genetically improved farmed tilapia Oreochromis niloticus (L.), subjected to short-term low temperature stress

文献类型： 外文期刊

第一作者： He, J.

作者： He, J.;Xu, P.;Yang, R. Q.;He, J.;Qiang, J.;Yang, H.;Xu, P.;Zhu, Z. X.

作者机构：

关键词： GIFT tilapia;Fatty acid;Antioxidant enzymes;Serum parameters;Cold stress

期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：2.902； 五年影响因子：3.102 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： We evaluated the effect of cold shock on the fatty acid composition, antioxidant enzymes, and physiological responses of genetically improved farmed tilapia (GIFT). Experimental GIFT tilapia, a warm-water teleost, were initially acclimated at 28 degrees C and then transferred directly to 13 degrees C. Stress responses were monitored for 120 h. There was a significant change in all parameters in response to the cold stressor (P < 0.05). Serum cortisol levels increased from 336.93 ng/ml to a peak of 1165.31 ng/ml 24 h after the initial cold shock, and declined rapidly thereafter. Serum glucose and cholesterol levels were significantly lower in the low temperature group than the control group at 120 h (P < 0.05). Acute low temperature stress enhanced superoxide dismutase, glutathione peroxidase, catalase, and glutathione levels in the liver of GIFT tilapia. The GIFT tilapia were able to selectively metabolize fatty acids for energy needs during the early period of exposure to low-temperature stress. During this time, they primarily used saturated fatty acids for energy. However as the duration of the stressor and loss of muscle fat increased, the fish began to metabolize long-chain polyunsaturated fatty acids. Increased malondialdehyde was produced by oxidation of these fatty acids leading to oxidative damage. Our results provide insight into the changes in fatty acid metabolism physiology that allow GIFT tilapia juveniles to adapt to short-term cold stress. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： Q7

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