Nilnaj Chaitanawisuti, Sirusa Kritsanapuntu, Wannanee Santaweesuk, 2011 Effects of dietary protein and lipid levels and protein to energy ratios on growth performance and feed utilization of hatchery-reared juvenile spotted babylon (Babylonia areolata) Aquaculture international 19(1):13-21 Abstract A 120-day feeding trial was designed to determine the effects of different dietary protein and lipid levels and protein to energy ratio (P:E) on growth performance and feed utilization of hatchery-reared juvenile spotted babylon, Babylonia areolata, cultured under a flow-through seawater system Six diets were formulated to contain three protein levels (18, 28, and 36%) and two lipid levels (10 and 15%) in a 3×2 factorial design with three replicates to provide six different dietary P:E ratios (50.17, 49.09, 68.50, 65.85, 88.66, and 85.36mg protein/kcal) Each replicate was stocked with 50 snails (0.12+0.01g, initial weight) and fed to satiation once daily The results showed that survival was above 96% at the end of the feeding trial in all groups and was not affected by either dietary protein level or dietary lipid level The highest significant (P