Changes in microbial communities associated with the conditioning of filter material in recirculating aquaculture systems of the pufferfish Takifugu rubripes

Aquaculture ◽  
2006 ◽  
Vol 256 (1-4) ◽  
pp. 287-295 ◽  
Author(s):  
Shiro Itoi ◽  
Ayako Niki ◽  
Haruo Sugita
Keyword(s):  
Microbial Communities ◽  
Filter Material ◽  
Takifugu Rubripes ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems

scholarly journals Bacterial Relationships in Aquaponics: New Research Directions

2019 ◽  
pp. 145-161 ◽  
Author(s):  
Alyssa Joyce ◽  
Mike Timmons ◽  
Simon Goddek ◽  
Timea Pentz
Keyword(s):  
Microbial Communities ◽  
Plant Production ◽  
Microbial Decomposition ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Wide Range ◽  
Technical Specifications ◽  
New Research ◽  
System 1

AbstractThe growth rates and welfare of fish and the quality of plant production in aquaponics system rely on the composition and health of the system’s microbiota. The overall productivity depends on technical specifications for water quality and its movement amongst components of the system, including a wide range of parameters  including factors such as pH and flow rates which ensure that microbial components can act effectively in nitrification and remineralization processes. In this chapter, we explore current research examining the role of microbial communities in three units of an aquaponics system: (1) the recirculating aquaculture system (RAS) for fish production which includes biofiltration systems for denitrification; (2) the hydroponics units for plant production; and (3) biofilters and bioreactors, including sludge digester systems (SDS) involved in microbial decomposition and recovery/remineralization of solid wastes. In the various sub-disciplines related to each of these components, there is existing literature about microbial communities and their importance within each system (e.g. recirculating aquaculture systems (RAS), hydroponics, biofilters and digesters), but there is currently limited work examining interactions between these components in aquaponics system, thus making it an important area for further research.

scholarly journals Understanding structure/function relationships in nitrifying microbial communities after cross-transfer between freshwater and seawater

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Blanca M. Gonzalez-Silva ◽  
Kjell Rune Jonassen ◽  
Ingrid Bakke ◽  
Kjetill Østgaard ◽  
Olav Vadstein
Keyword(s):  
Microbial Communities ◽  
Rrna Gene ◽  
Physiological Plasticity ◽  
Oxidation Rates ◽  
Salinity Changes ◽  
Recirculating Aquaculture ◽  
Seawater Salinity ◽  
Recirculating Aquaculture Systems ◽  
Before And After

AbstractIn this study, nitrification before and after abrupt cross-transfer in salinity was investigated in two moving bed biofilm reactors inoculated with nitrifying cultures that had adaptation to freshwater (FR) and seawater salinities (SR). FR and SR MBRRs were exposed to short and long term cross-transfer in salinity, and the functional capacity of nitrifying microbial communities was quantified by the estimation of ammonia and nitrite oxidation rates. Salinity induced successions were evaluated before and after salinity change by deep sequencing of 16S rRNA gene amplicons and statistical analysis. The bacterial community structure was characterized and Venn diagrams were included. The results indicated that after salinity cross-transfer, the FR was not significantly recovered at seawater salinity whereas SR showed high resistance to stress caused by low-salt. Succession and physiological plasticity were the main mechanisms of the long-term adaption of the nitrifying communities exposed to abrupt salinity changes. Independently of salinity, some nitrifiers presented high physiological plasticity towards salinity and were very successful at both zero and full seawater salinity. SR culture is robust and suitable inoculum for ammonium removal from recirculating aquaculture systems and industrial wastewaters with variable and fast salinity changes. Our findings contradict the current perspective of the significance of salinity on the structure of nitrifying communities.

scholarly journals A Temporally Dynamic Gut Microbiome in Atlantic Salmon During Freshwater Recirculating Aquaculture System (RAS) Production and Post-seawater Transfer

2021 ◽  
Vol 8 ◽  
Author(s):  
Marlene Lorgen-Ritchie ◽  
Michael Clarkson ◽  
Lynn Chalmers ◽  
John F. Taylor ◽  
Herve Migaud ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Microbial Communities ◽  
16S Rrna Gene Sequencing ◽  
Fish Growth ◽  
Organic Load ◽  
Rrna Gene ◽  
Microbial Composition ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Rrna Gene Sequencing

Atlantic salmon aquaculture is undergoing an expansion of land-based recirculating aquaculture systems (RAS), especially for freshwater (FW) stages of production. Juvenile salmon undergo parr-smolt transformation, also known as smoltification and become pre-adapted to tolerate seawater (SW). One aspect requiring study is the development of microbial communities during this time, especially in RAS systems. Here we analyzed temporal changes in microbiome associated with the intestine in Atlantic salmon during smolt production in a commercial RAS production facility and followed the same cohort of fish post-seawater transfer (SWT), using 16S rRNA gene sequencing. Microbial diversity and richness showed an increase over time across FW production, but declined sharply and significantly 1-week post-SWT before re-establishing itself with a completely different community structure after 4 weeks. Core microbial taxa could be assigned to three distinct categories; (1) omnipresent, (2) salinity specific, or (3) transient. By including diet and water samples in the analyses, we classified true core taxa associated with the host, those associated with the diet, and transient cores associated with microbial communities in tank water. The rising trend observed in microbial richness in the water may be a consequence of a temporal increase in organic load while dominance of Vibrionaceae may be attributed to the higher temperatures maintained during RAS production and above average natural water temperatures post-SWT. Functional analysis suggests modulation of metabolic pathways post-SWT, but downstream impacts on fish growth and health in a commercial setting remain to be elucidated. A deeper understanding of the interplay between microbial composition and functionality can play a role in optimizing fish performance in tightly regulated RAS production.

scholarly journals Enriched Microbial Communities for Ammonium and Nitrite Removal from Recirculating Aquaculture Systems

2021 ◽  
Author(s):  
Alireza Neissi ◽  
Gholamreza Rafiee ◽  
Shadi Rahimi ◽  
Hamid Farahmand ◽  
Santosh Pandit ◽  
...  
Keyword(s):  
Microbial Communities ◽  
High Performance ◽  
Pathogenic Bacteria ◽  
Environmental Water ◽  
Recirculating Aquaculture ◽  
Expression Of Genes ◽  
Recirculating Aquaculture Systems ◽  
Nitrite Oxidizing Bacteria ◽  
Nitrite Removal ◽  
Aquaculture Water

Abstract Background: The aim of this study was the enrichment of high-performance microbial communities in biofilters for removal of ammonium and nitrite from aquaculture water. Methods: Ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) were enriched from different environmental water samples. The microbial communities with higher ammonium and nitrite removal activity were selected and adapted to different temperatures [9 ºC, 15 ºC, room temperature (25 ºC), and 30 ºC]. The expression of genes involved in nitrification including ammonia monooxygenase (AMO) and nitrite oxidoreductase (NXR) were measured in temperature-adapted AOB and NOB microbiomes. The microbial species present in the selected microbiomes were identified via 16s rRNA sequencing. Results: The microbial communities containing Nitrosomonas oligotropha and Nitrobacter winogradskyi showed the highest ammonium and nitrite removal activity at all temperatures used for adaptation. Furthermore, the microbial communities do not contain any pathogenic bacteria. They also exhibited the highest expression of AMO and NXR genes. Using the enriched microbial communities, we achieved a 288% and 181% improvement in ammonium and nitrite removal over the commonly used communities in biofilters at 9 °C, respectively. Conclusions: These results suggest that the selected microbiomes allowed for a significant improvement of water quality in a recirculating aquaculture system (RAS).

scholarly journals Anaerobic Mineralization of Recirculating Aquaculture Drum Screen Effluent for Use as a Naturally-Derived Nutrient Solution in Hydroponic Cropping Systems

Conservation ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 151-167
Author(s):  
Joseph Tetreault ◽  
Rachel Fogle ◽  
Todd Guerdat
Keyword(s):  
Nutrient Solution ◽  
Agricultural Waste ◽  
The United States ◽  
Anaerobic Treatment ◽  
Production Costs ◽  
Effluent Treatment ◽  
Limiting Factors ◽  
Fertilizer Treatment ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems

Operation and effluent treatment costs are limiting factors for the success of recirculating aquaculture systems (RAS) in meeting seafood demand in the United States. Adopting a capture-and-reuse waste management model similar to terrestrial agriculture farmers would allow RAS farmers to monetize effluent and offset production costs. The moisture content and nutrient profile of RAS effluent makes it a potential option for use as a hydroponic fertilizer. Treatment of RAS waste is needed to mineralize particulate-bound nutrients before becoming a viable hydroponic nutrient solution. Anaerobic treatment (AT), a method used by municipal and agricultural waste treatment facilities to reduce total solids, has been shown to successfully mineralize particulate-bound nutrients from RAS effluent. Continuously mixed anaerobic batch bioreactors were used to evaluate the degree to which AT may mineralize particulate-bound nutrients in solid RAS waste. Concentrations of twelve different macro- and micro-nutrients were analyzed in the waste before and after treatment. Effluent samples were analyzed to determine the fraction of each nutrient in the solid and aqueous forms. This study showed that AT is an effective method to mineralize particulate-bound nutrients in RAS effluent and the mineralization rate data may be used to design a pilot-scaled flow-through RAS effluent treatment system.

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