The fish growth and yield parameters of both groups are shown in
Table 2. Weight gain and individual fish weight in the BFT treatment
was 9.46% and 12.54% higher, respectively, than in the control group.
Furthermore, BFT significantly increased the SGR of fish in the BFT
group at harvest (P b 0.05). The survival rate of fish in the BFT treatment
and control tanks was 100%. Compared with the control group, the FCR
of the BFT group was 17.5% lower, while the PER was 22.2% higher. The
net yield of the BFT group (6.22 kg m−3
) was significantly higher than
that of the control (5.88 kg m−3
)(P b 0.05). Luo et al. (2014) reported
similar results for fish growth and feed utilization parameters. Biofloc
contributes significantly to the growth of fish (Avnimelech, 2007;
Azim and Little, 2008), and this finding is consistent with the present
results. Burford et al. (2004) found that over 29% of the daily food
consumed by Litopenaeus vannamei could be biofloc. In addition, biofloc
has been demonstrated to be an effective potential food source for tila-
pia using a stable nitrogen isotope labeling technique (Avnimelech,