Aquacultural solid waste from a recirculation aquaculture system was used as a substrate to produce
heterotrophic bacteria in suspended growth reactors. The efficiency of nitrogen recycling under inter-
mittent aeration (IA, 0.5-h aeration/0.5-h non aeration) and continuous aeration (CA) strategy was
investigated. The nitrogen dynamics, biochemical composition of biofloc and efficiency of nitrifica-
tion/denitrification/ammonium assimilation of biofloc were determined. No significant differences were
observed in the nitrogen recycling rate, crude protein and polysaccharides contents of biofloc between
the IA and CA reactors. The energy used for intermittent aeration was almost one half of that for con-
tinuous aeration. IA strategy (0.5-h aeration/0.5-h non aeration) appears to be more effective to produce
biofloc in aquaculture solid waste in reactors than CA strategy.