

FOLLOWUS
1.Key Laboratory of Marine Resource Chemistry and Food Technology(TUST), Ministry of Education; College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China
2.Institute of Fisheries Science, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa 850000, China
Liying SUI, E-mail: suily@tust.edu.cn
Received:06 May 2021,
Accepted:12 August 2021,
Online First:22 September 2021,
Published:2022-07
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Xuejiao LIANG, Chi ZHANG, Dongdong DU, et al. Application of biofloc technology in recirculation
Xuejiao LIANG, Chi ZHANG, Dongdong DU, et al. Application of biofloc technology in recirculation
Biofloc technology (BFT) improves water quality
and productivity of the farmed species through converting ammonium nitrogen to microbial protein
stabilizing microbial community
and reducing the production cost. In this study
a small-scale biofloc development unit was designed in combination of recirculation system (RAS) for
Artemia
culture.
Artemia
growth
water quality
and microbial composition of bioflocs in RAS were studied in comparison with in-situ batch culture (Glu). Glucose was added in RAS and Glu at C/N ratio of 10. The cultures without glucose addition
but with 50% daily water renewal (WRe) and without water renewal (NWRe) were considered as the controls.
Artemia
were cultured at 25 ¦ and salinity 30 for 24 days and fed formulated feed. The results showed that compared to the controls
Glu significantly improved the
Artemia
biomass
increased the biofloc volume
and reduced the content of total ammonia nitrogen (TAN)
nitrite nitrogen (NO
2
-N) and nitrate nitrogen (NO
3
-N) in water column (
P
<
0.05). In addition
RAS had similar results with Glu. High throughput sequencing analysis on biofloc microbial composition demonstrated that glucose supplement shaped the microbial community structure
and increased proportion of potential probiotic bacteria and suppressed pathogenic bacteria growth. Furthermore
we analyzed the relationship between the microbial composition of biofloc and environmental factors. Canonical correspondence analysis (CCA) indicated that inorganic nitrogen in culture water had great impact on biofloc microbial composition in NWRe and WRe
whilst the dissolved organic carbon (DOC) modified the microbial community in Glu and RAS. This study shows the advantages of BFT in
Artemia
culture and provides practical information for applying BFT-RAS in indoor
Artemia
culture.
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