Abstract
A significant variation in the membrane fluidity (as assessed by DPH–fluorescence polarisation) and membrane lipid bilayer composition is noticed in the subcellular membranes of the gill epithelial cells of Oreochromis niloticus due to exposure of the fish to 1% saline water for 1 month. Also, a 70% enhanced activity of Na +–K +-ATPase in plasma membranes and a 2.5-fold increase of glucose-6–phosphate dehydrogenase in microsomal membranes are recorded in the treated fish. The changed membrane structure and fluidity along with the changed enzymatic activity of Na +–K +-ATPase help the influx the Na + rather than the efflux of K + through the gill epithelial cells during salinity adaptation.
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