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Not AvailableThe effect of four iso-nitrogenous and iso-lipidic diets containing soy lecithin and lysolecithin with fish oil (sardine) and palm oil on growth, digestibility, and fatty acid composition of tail muscle and non-muscle portions of tiger shrimp,Penaeus monodon,was evaluated. Shrimp fed with lysolecithin diets had significantly (P<0.05) higher daily growth coefficient values (1.40–1.45% day−1) than those fed with soylecithin containing diets (1.32– 1.37% day−1). Correspondingly, lysolecithin-supplemented diets showed significantly higher (P<0.05) apparent digestibility coefficients (ADC) of fatty acids with both the oils due to higher emulsification ability of small micelle forming by lysolecithin.However, there were no significant differences in survival and FCR among all treatments. The fatty acid composition of the test diets reflected to a certain extent in the fatty acid composition of the muscle and non muscle portions of shrimp. Arachidonic, eicosapentaenoic, and docosahexaenoic acid contents of muscle and non-muscle portions of shrimp were significantly (P