Comparison of fatty acid composition in cell membrane of Scylla Paramamosain between different waters in winter

Gas chromatograph method was used to measure fatty acid composition in cell membrane of mud crab Scylla paramamosain from the different waters in winter in order to understand the impact of low temperature on fatty acid composition in membrane and the adaptation in winter.The results showed that the different changes of fatty acid composition appeared in cell membranes of different organs and tissues in S.paramamosain C16∶0 and C16∶1 relative content in cell membranes of gills and hepatopancreas in Ninghai waters were significant lower than these in Xiamen waters respectively(P0.01 or P0.05);C18∶0 relative content in cell membrane of hepatopancreas in Ninghai waters was significantly lower than that in Xiamen waters(P0.01);C20∶4 in cell membranes of gill,hepatopancreas and muscle in Ninghai waters increased in contrast with Xiamen waters(P0.01 or P0.05);C20∶5 in hepatopancreas cell membrane was also significantly higher than that in Xiamen waters(P0.01).Saturation index of ∑SFA/∑UFA in cell membranes of gill and hepatopancreas in Ninghai waters significantly decreased compared with the Xiamen waters(P0.01 or P0.05).For saturation index in cell membrane of muscle,there was no significant difference between Ninghai and Xiamen waters(P0.05).In conclusion,in Ninghai waters with the lower temperature in winter,the increase of relative contents of non-saturation fatty acids in cell membrane results in the decrease of saturation index to be used to keep the fluidity of cell membrane and ensure its ability to perform biological function.