Abstract
Core sediments taken from Harima Nada and Osaka Bay at different depths were examined for organic carbon and fatty acid contents. In the upper 20cm layer fatty acid contents decreased with depth. The decrease rate (K=y-1) of fatty acid on the surface layer (0-20cm) of sediments was 3.5_??_3.8•10-2y-1. The vertical distributions of fatty acids in sediments of Harima Nada and Osaka Bay were similar to those of Hiuchi Nada, Suo Nada and Hiroshima Bay.