A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (<i>Salmo salar</i>L.)

Roalkvam, Irene; Drønen, Karine; Dahle, Helge K.; Wergeland, Heidrun I.

doi:10.1111/are.14872

Cited by 12 publications

(4 citation statements)

References 49 publications

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“…Cultures were initially identified by gram staining. Suspected cultures were evaluated for presence of ammonia and nitrite and vice versa for production of nitrite and nitrate (Saha et al 2014;Roalkvam et al 2020). Identification of Nitrosomonas was tested by the Nessler's reagent (Raud et al 2013;Agus Fitri et al 2017) and Nitrosomonas and Nitrobacter were confirmed through Trommsdrof's reagent (Hanks & Weintraub 1936;Kshatri et al 2017).…”

Section: Bacteriological Analysesmentioning

confidence: 99%

“…as probiotics were found to be significant in maintaining the water quality properties and in reducing the load of pathogenic bacteria (Sunitha & Krishna 2016). Nitrifying microbial community has the ability for better fish production by promoting water parameters (Roalkvam et al 2020;Xu et al 2020). Therefore, the application of probiotics could effectively decrease the contaminant levels in water bodies, reducing the load of pathogenic microbes and enhance survival of aquatic animals.…”

Section: Introductionmentioning

confidence: 99%

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Water quality assessment of East Kolkata Wetland with a special focus on bioremediation by nitrifying bacteria

Saha

Sarkar

Bandyopadhyay

2021

Water Science and Technology

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East Kolkata Wetlands (EKW) is designated as International Ramsar site and are the hotspot for large-scale wastewater aquaculture practices. However, the continued surveillance of physicochemical properties of water and application of an eco-friendly approach are essential to ensure safe aquaculture practices. In the present study, we assessed the seasonal variation in physicochemical parameters of water across EKW and investigated the role of nitrifying bacteria as probiotics. We statistically analyzed various physicochemical properties of water samples from EKW. Results of the statistical analysis indicated a significant variation in all the physicochemical parameters across the selected water bodies of EKW (p < 0.01). We isolated and enumerated Nitrosomonas sp. and Nitrobacter sp. and assessed their ability to degrade trichloroethylene (TCE). The role of Nitrosomonas and Nitrobacter sp. were further investigated and established through a small-scale experiment. Two microbial isolates, NSW3 and NBW2, displayed superior TCE degradation ability at pH 5, and the application of these strains as probiotics were found to improve the quality of water and survival rate of fishes in the treated experimental tanks. Our findings suggest that the application of the above mixed bacterial cultures in aquaculture could be an effective and environment-friendly approach for safe and productive aquaculture operations.

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Section: Bacteriological Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water quality assessment of East Kolkata Wetland with a special focus on bioremediation by nitrifying bacteria

Saha

Sarkar

Bandyopadhyay

2021

Water Science and Technology

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“…The slow development of nitrifying bacteria makes the biofilter less efficient during the activation period, causing reduced water quality due to increased concentrations of ammonia and nitrite, which can be harmful for the fish or inhibit further microbial biofilter development (Roalkvam et al, 2021). Several factors can impact the development of the microbial communities such as temperature and salinity of the biofilter, and this is an area of current research in RAS (Kinyage and Pedersen, 2016;Navada et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a Recirculating Aquaculture System Research Facility Designed to Address Current Knowledge Needs in Atlantic Salmon Production

et al. 2022

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A better understanding of recirculating aquaculture system (RAS) biosecurity is crucial for the sustainable and ethical production of Atlantic salmon smolt and post-smolt in these systems. This study described and evaluated the performance of a RAS facility for fish infection research with Atlantic salmon as the main animal model. Fish body weight, length, water quality, and system metrics from five independent experimental trials conducted between September 2020 and July 2021 were used to analyze the variation within and between treatments. Statistical power analysis was performed to determine the minimum number of fish required. The fish parameters variability showed that the inter-class correlation coefficient was on average low (0.1) and that the variation within tanks was larger than the variation between the tanks. The power analysis showed that 15 fish were required to be sampled per tank under these study conditions. Variation of water quality and system management metrics among the five experimental trials was higher compared to the variation within the five experimental trials. Moreover, the variation of the water quality parameters controlled by sensors was relatively low, whereas the parameters depending on biofilter maturation level and performance presented a very high variation. Water exchange rate-dependent quality parameters showed a similar variation value, i.e., nitrate and water turbidity. The established baseline for variability and performance presents an important reference for the design and realization of future experiments in RAS facilities. It is foreseen that the current research facility will develop new knowledge to improve the RAS biosecurity in the Atlantic salmon aquaculture industry.

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“…Besides, a relatively lower stocking density provides low, stable concentrations of ammonia, nitrite, and organic load. And it can promote the development of nitrifying bacterial populations in RAS bioreactors (Roalkvam et al, 2021). At the same time, the breeding density should not be too low, because the increase of living space will increase the energy consumption at low densities, which may lead to the decrease of feed utilization rate and reduced economic benefit.…”

Section: Effects Of Environmental Factors On Rasmentioning

confidence: 99%

A review of influencing factors on a recirculating aquaculture system: Environmental conditions, feeding strategies, and disinfection methods

Cui

et al. 2023

J World Aquaculture Soc

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Recirculating aquaculture system (RAS), as a modern highly intensive aquaculture mode, demonstrates the advantages of environmental friendliness, high efficiency and sustainable development, and has been widely used worldwide; they are also expected to be more widely applied in industrial aquaculture in the future as our natural resources are decreasing. However, RAS imposes very high requirements on operating conditions, including temperature, salinity, dissolved oxygen, pH, stocking density, light, feed composition, feeding amount, feeding frequency, and disinfection methods. Each factor is critical to the stable operation of the system. Therefore, to ensure the efficient and stable operation of RAS, its influencing factors must be controlled to within appropriate ranges. Herein, the factors affecting the operation of RAS are reviewed, and the mechanisms of their influence on the reared organisms are revealed, and suggestions on the control of these factors in aquaculture are proposed. This review can provide a theoretical basis for the further development of RAS.

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A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salarL.)

Abstract: Development of new technology within aquaculture the industry is important in order to expand seafood production or pursue cost-effective operations within fish farming. Today, recirculating aquaculture systems (RASs) are used for rearing salmon in countries such as

Cited by 12 publications

References 49 publications

Water quality assessment of East Kolkata Wetland with a special focus on bioremediation by nitrifying bacteria

Water quality assessment of East Kolkata Wetland with a special focus on bioremediation by nitrifying bacteria

Evaluation of a Recirculating Aquaculture System Research Facility Designed to Address Current Knowledge Needs in Atlantic Salmon Production

A review of influencing factors on a recirculating aquaculture system: Environmental conditions, feeding strategies, and disinfection methods

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