A method for increasing the ratio of docosahexaenoic acid to eicosapentaenoic acid in the live prey of larval fish comprising administering a highly unsaturated fatty acid soap powder to the live prey wherein the highly unsaturated fatty acid soap powder has a ratio of docosahexaenoic acid to eicosapentaenoic acid greater than 1.0 to 1.0.
展开▼