Shrimp growth is a primary production consideration for good economic returns. Hence, there is considerable interest in developing diets that promote growth and survival. A number of bioactive feed components are supplemented in shrimp feed to improve feed intake and growth. NovaqPro® is a high ash low protein marine microbial biomass proven to improve Litopenaeus vannamei growth. The present study evaluated the effects of supplementing the bacterial biomass on feeding behavior, growth, and feed intake of juvenile L. vannamei . Six isonitrogenous (36% crude protein) and isolipidic (6% crude lipid) diets were prepared to include graded levels (0-20% of the diet) of the bacterial biomass . Diets were used in two growth trials, where 15 juvenile L. vannamei (0.27±0.01g and 0.58±0.02g, respectively) were size sorted and stocked in an indoors recirculating aquaculture system. Each diet was randomly assigned to five replicate tanks. In the second trial, two additional treatments consisting of providing the basal and the 10% bacterial biomass diets in excess (+15% of the standard ration), were added. Additionally, feed intake was assessed by offering shrimp one gram of “as is” feed, then siphoning leftovers after 30 minutes to calculate feed consumption. Feed intake was also assessed via passive acoustic monitoring of shrimp feeding behavior. Results of the present study suggest that the bacterial biomass can be supplemented at up to 20% of shrimp diets without significant effects on growth, survival, and FCR (p>0.05) (Table 1). However, when offered in excess, diets containing 10% bacterial biomass resulted in better growth, and FCR. Acoustics data support the growth results. Bacterial biomass as bioactive feed component promotes shrimp growth, and helps improve production and increase profit.