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[Objective] The aim of this study was to determine the effects of dietary phospholipids on Na+-K+-ATPase activity and cell membrane fatty acid composition in the gill of catfish (Pangasius sutchi). [Method] 900 healthy catfish (1.4±0.08 g of average weight) were randomly divided into five groups. Dietary phospholipids level of group PL0 was 0%, and 1%, 2%, 3%, 4% for group PL1, PL2, PL3, PL4, respectively. The experiment lasted for 56 days. [Result] The results showed that the Na+-K+-ATPase activity in gill decreased gradually with the increase of the dietary phospholipids level (P<0.05). Cell membrane fatty acid composition was affected significantly by dietary phospholipids. The content of saturated fatty acids and monounsaturated fatty acids of group PL0 was the highest (P<0.05), however, it had the lowest content of highlyunsaturated fatty acids (P<0.05). The content of polyunsaturated fatty acids of group 3 was higher than group 0 and group 1 (P<0.05). [Conclusion] The results indicated that there is obvious compensation effects on Na+-K+-ATPase activity with phospholipids content changes in gills of catfish (Pangasius sutchi) to maintain stable physiological level and normal basal metabolism and the increase of ΣHUFA and ΣPUFA is necessary for gill cell membrane to better maintain and perform normal physiological function.
[Objective] The aim of this study was to determine the effects of dietary phospholipids on Na + -K + -ATPase activity and cell membrane fatty acid composition in the gill of catfish (Pangasius sutchi). [Method] 900 healthy catfish (1.4 ± 0.08 g of average weight were randomly divided into five groups. Dietary phospholipids level of group PL0 was 0%, and 1%, 2%, 3%, 4% for group PL1, PL2, PL3, PL4, respectively. The experiment lasted for 56 days. [Result] The results showed that the Na + -K + -ATPase activity in gill decreased gradually with the increase of the dietary phospholipids level (P <0.05). Cell content of saturated fatty acid was significantly increased by dietary phospholipids. The content of saturated fatty acids and monounsaturated fatty acids of group PL0 was the highest (P <0.05), however, it had the the lowest content of highly unsaturated fatty acids (P <0.05). The content of polyunsaturated fatty acids of group 3 was higher than group 0 and group 1 (P <0.05). [Conclusion] The results in dicated that there is obvious compensation effects on Na + -K + -ATPase activity with phospholipids content changes in gills of catfish (Pangasius sutchi) to maintain stable physiological level and normal basal metabolism and the increase of ΣHUFA and ΣPUFA is necessary for gill cell membrane to better maintain and perform normal physiological function