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C/N ratio-induced structural shift of bacterial communities inside lab-scale aquaculture biofilters ArchiMer
Michaud, Luigi; Lo Giudice, Angelina; Interdonato, Filippo; Triplet, Sebastien; Ying, Luo; Blancheton, Jean-paul.
In Recirculating Aquaculture Systems (RAS) various chemical compounds (mainly nitrates and organic carbon) accumulate in the rearing water. These chemical substrata regulate the ecophysiology of the bacterial communities of the biofilter and have an impact on its nitrification efficiency and reliability. In the present study chemical and microbiological parameters in static mineral bed (SBB) and moving plastic bed (MBB) biological filters were monitored at increasing C/N ratios ranging from 0 (pure nitrification) to 4 (combined nitrification and organic carbon removal), with the aim to investigate the shift of the bacterial community structure and major taxa relative abundances. Results suggest that the MBB are less subjected to the nitrification...
Tipo: Text Palavras-chave: Recirculating aquaculture system; Biofilters; C/N ratio; Microbial community structure.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00167/27846/26070.pdf
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Recirculating aquaculture system (RAS) biofilters: focusing on bacterial communities complexity and activity ArchiMer
Interdonato, Filippo.
This research has been carried out in order to better understand the relationships between bacterial communities, established within the biofilter of a recirculating aquaculture system, and the influence exerted by forcing factors on the system itself. The work was divided into three main objectives that were aimed at studying: - the composition of the metabolically active bacterial fraction through the construction of cDNA clone libraries and the application of fingerprinting techniques (e.g., the T-RFLP); - the effect of particulate organic carbon on both the nitrification process and the microbial communities in different types of biological filters; - the effect of a moderate increase in the oxidation-reduction potential (ORP), through the injection of...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00074/18516/16060.pdf
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