Seaweeds, especially brown seaweeds, have a balanced fatty acid composition with reference to n-3/n-6 FA ratio pointing to their usefulness as sources of PUFA and also make them suitable candidates for further research as dietary ingredients in aquaculture feeds for fish/shrimp hatchery, as these diets require higher PUFA contents. Some of the seaweeds contain unique lipid compounds like NMI and conjugated fatty acids. These unique fatty acids need to be explored for their value as taxonomic markers too. Further, cytotoxic effects of lipid extracts including conjugated polyenes...