showed that olive flounder ( Paralichthys olivaceus ) fed with a herbal mixture of medicated leaven ( Massa medicata fermentata ), hawthorne ( Crataegi fructus ), virgate wormwood ( Artemisia capillaris ) and Cnidium officiale (2:2:1:1) had higher weight gain than the control fish and showed higher total carcass unsaturated fatty acid content and lower carcass saturated fatty acid content, indicating that feeding with the herbal mixture improves fatty acid utilization.