This work compared the use of dextrose and molasses as carbon sources for biofloc development,
water quality maintenance, microorganism composition and growth performance of Litopenaeus vannamei
juveniles in biofloc technology (BFT). Two treatments, dextrose and molasses, were tested with four replicates
each. Carbon was added to achieve a C:N-AT (N-(NH3+NH4
variables were monitored daily, and shrimp growth was estimated through periodic biometry. After 30 days,
survival, final biomass, and feeding conversion rate (FCR) were determined. Dissolved organic carbon,
chlorophyll-a, floc volume, total ammonia, nitrite, nitrate and phosphate concentrations, and microorganisms
(qualified by groups), were measured every three days. Water quality variables remained within acceptable
levels throughout the experimental period, except for nitrite, which reached higher levels than recommended for
this species. The use of dextrose resulted in higher water transparency, which influenced the remaining centric
diatoms. A superior shrimp performance was observed at this treatment, presumably because of variations on
the microbial community. Therefore, it is concluded that the addition of dextrose results in a superior growth
performance of L. vannamei when cultured in BFT systems.