Abstract
1. Carp ( Cyprinus carpio) were exposed to four surfactants at the concentration of 0.02 mM (dodecylbenzenesulfonate (DBS); 7mg l −1, sodium laurylsulfonate (LNa); 5.7mg l −1, sodium stearate (SNa); 6.1 mg l −1, nonylphenyl ethoxylate (EN); 13.2 mg l −1). 2. The changes in lipid composition of the gill were compared. No change in fatty acid composition of neutral lipids and complex lipids occurred after exposure to SNa, whereas changes did occur after DBS, EN and LNa. 3. In the single case of exposure to DBS, the content of phosphatidylcholine was significantly increased as compared to control gills. 4. The ratio cholesterol/total phospholipid and the ratio unsaturated fatty acid/saturated fatty acid were not changed after exposure to all surfactants tested. 5. The order of gill damages was DBS > LNa > SNa > EN.
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