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Application of biodegradable polymers as carbon sources in ex situ biofloc systems: Water quality and shift of microbial community
Author(s) -
Kokkuar Natalee,
Li Li,
Srisapoome Prapansak,
Dong Shuanglin,
Tian Xiangli
Publication year - 2021
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.15200
Subject(s) - biology , food science , microbial population biology , proteobacteria , population , nitrate , shrimp , nitrite , ecology , bacteria , 16s ribosomal rna , genetics , demography , sociology
Abstract Biofloc technology (BFT) is widely applied in aquaculture. The present study was carried out to evaluate the effects of different carbon sources on microbial population in BFT system. Four carbon sources, glucose (Glu), molasses (Mol), polybutylene succinate (PBS) and polyhydroxy butyrate‐hydroxy valerate (PHBV), were tested in a 44‐day trial. No carbon sources were added in control (Con). Results showed that DO, total alkalinity and biofloc volume were significantly different among treatments. Total ammonia nitrogen (TAN) accumulation was observed during the first 14 days, and the nitrite nitrogen and nitrate nitrogen increased from day 9 to 19 in all treatments. Proteobacteria and Bacteroidetes were the most abundant phyla in all the treatments. The unweighted pair‐group method with arithmetic means tree and principal coordinate analysis (PCoA) indicated that the distribution of microbial community was categorized into three groups. Glu and Mol formed two separate groups, the other treatments formed the third category. Chemoheterotrophy and aerobic chemoheterotrophy were the two most abundant functions, and the percentage of the occurrence of these two functions in Con was 70.5%, highest among treatments. PCA and function annotation indicated that the Glu and Con had different functional compositions compared with the other groups. The Glu had a more diverse functional composition. Overall, the glucose can be best used by the microorganisms. With low biofloc volume, the selection of PBS and PHBV as carbon sources in BFT needs to be further studied to achieve maximum effectiveness.