A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.)
Marine recirculation aquaculture system (RAS) is a prominent technology within fish farming. However, the nitrifying bacteria in the biofilter have low growth rates, which can make the biofilter activation a long and delicate process with periods of low nitrification rates and variations in water qu...
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Online Access: | https://hdl.handle.net/11250/2728437 https://doi.org/10.1111/are.14872 |
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ftunivbergen:oai:bora.uib.no:11250/2728437 2023-05-15T15:31:32+02:00 A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.) Roalkvam, Irene Drønen, Karine Dahle, Håkon Wergeland, Heidrun Inger 2020-09 application/pdf https://hdl.handle.net/11250/2728437 https://doi.org/10.1111/are.14872 eng eng Wiley urn:issn:1355-557X https://hdl.handle.net/11250/2728437 https://doi.org/10.1111/are.14872 cristin:1833811 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright The author(s) Aquaculture Research 94-104 52 1 Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1111/are.14872 2023-03-14T17:40:05Z Marine recirculation aquaculture system (RAS) is a prominent technology within fish farming. However, the nitrifying bacteria in the biofilter have low growth rates, which can make the biofilter activation a long and delicate process with periods of low nitrification rates and variations in water quality. More knowledge on the microbial development in biofilters is therefore needed in order to understand the rearing conditions that favour optimal activation of the biofilters. In this case study, we investigated the activation of two biofilters in a marine RAS for Atlantic salmon post‐smolt associated with either high or low stocking densities of fish by monitoring the microbial communities and chemical composition. The results showed that the microbial communities in both biofilters were similar during the first rearing cycle, despite variations in the water quality. Nitrifying bacteria were established in both biofilters; however, the biofilter associated with low stocking density had the highest relative abundance of ammonia‐oxidizing Nitrosococcus (1.0%) and nitrite‐oxidizing Nitrospira (2.1%) at the end of the first rearing cycle, while the relative abundance of ammonia‐oxidizing Nitrosomonas (2.3%–2.9%) was similar in both biofilters. Our study showed that low fish stocking density during the first rearing cycle provided low and steady concentrations of ammonium, nitrite and organic load, which can stimulate rapid development of a nitrifying population in new marine RAS biofilters. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar University of Bergen: Bergen Open Research Archive (BORA-UiB) Aquaculture Research 52 1 94 104 |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
description |
Marine recirculation aquaculture system (RAS) is a prominent technology within fish farming. However, the nitrifying bacteria in the biofilter have low growth rates, which can make the biofilter activation a long and delicate process with periods of low nitrification rates and variations in water quality. More knowledge on the microbial development in biofilters is therefore needed in order to understand the rearing conditions that favour optimal activation of the biofilters. In this case study, we investigated the activation of two biofilters in a marine RAS for Atlantic salmon post‐smolt associated with either high or low stocking densities of fish by monitoring the microbial communities and chemical composition. The results showed that the microbial communities in both biofilters were similar during the first rearing cycle, despite variations in the water quality. Nitrifying bacteria were established in both biofilters; however, the biofilter associated with low stocking density had the highest relative abundance of ammonia‐oxidizing Nitrosococcus (1.0%) and nitrite‐oxidizing Nitrospira (2.1%) at the end of the first rearing cycle, while the relative abundance of ammonia‐oxidizing Nitrosomonas (2.3%–2.9%) was similar in both biofilters. Our study showed that low fish stocking density during the first rearing cycle provided low and steady concentrations of ammonium, nitrite and organic load, which can stimulate rapid development of a nitrifying population in new marine RAS biofilters. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Roalkvam, Irene Drønen, Karine Dahle, Håkon Wergeland, Heidrun Inger |
spellingShingle |
Roalkvam, Irene Drønen, Karine Dahle, Håkon Wergeland, Heidrun Inger A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.) |
author_facet |
Roalkvam, Irene Drønen, Karine Dahle, Håkon Wergeland, Heidrun Inger |
author_sort |
Roalkvam, Irene |
title |
A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.) |
title_short |
A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.) |
title_full |
A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.) |
title_fullStr |
A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.) |
title_full_unstemmed |
A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.) |
title_sort |
case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing atlantic salmon (salmo salar l.) |
publisher |
Wiley |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2728437 https://doi.org/10.1111/are.14872 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Aquaculture Research 94-104 52 1 |
op_relation |
urn:issn:1355-557X https://hdl.handle.net/11250/2728437 https://doi.org/10.1111/are.14872 cristin:1833811 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright The author(s) |
op_doi |
https://doi.org/10.1111/are.14872 |
container_title |
Aquaculture Research |
container_volume |
52 |
container_issue |
1 |
container_start_page |
94 |
op_container_end_page |
104 |
_version_ |
1766362062071529472 |