Performance and stress resistance of juvenile abalone (Haliotis discus) fed formulated diets substituting fish meal (FM) and macroalgae (MA) with soybean meal and rice bran, respectively, was compared with the MA under various stress conditions. Four experimental diets (Standard, FM50, FM50 MA50, and FM50 MA100 diets) were prepared in duplicate. The dry MA (Undaria pinnatifida and Laminaria japonica)were also prepared to compare with the effects of formulated diets on the performance of abalone to achieve the industry standard. About 84,000 juvenile abalone were distributed into twelve 5-ton tanks (7,000 abalone per tank). The diets were fed to abalone once a day to satiation. At the end of the 16-wk feeding trial, abalone were subjected to various stress (air exposure, sudden salinity, and temperature changes) conditions and cumulative mortality was monitored. Weight gain and specific growth rate of abalone fed the all formulated diets were higher than the dry MA. The cumulative mortality of abalone fed the MA was higher than that of abalone fed the all formulated diets at the end of observation after sudden salinity and temperature changes. In conclusion, the well-formulated diets produced better growth performance of abalone over the dry MA. Abalone subjected to the various stress conditions after being fed with all formulated diets, except for abalone fed with the Standard, FM50, and FM50 MA50 diets after air exposure, were more resistant than those fed the MA.