Fish farms are important contributions to sustainable food production, and new technologies have made it possible to cultivate salmon and lump fish in closed fish farms on shore. The biggest challenge is to keep the fish healthy in order to have a normal developement and weight gain. In this project I will study the biofilm formation in tanks, tubes and filters in 3 of these fish farms. The biofilms can give a poorer water quality and also host fish pathogenic bacteria that could effect the fish in a negative manner. One of the main goals in this project is to develop tools for monitoring changes in the biofilm community or increased abundance of fish pathogens so that operational precaustions can be made in order to avoid disease outbrakes.
Furthermore, a well-studied fish pathogenic bacterium called Tenacibaculum has been chosen as a model organism for studies on infections from bacteria in the close environment. Increased knowledge on virulence and quorum sensing mechanisms in this bacterium is important because it can tell us how an environmental microbe can become a fish pathogen in certain cases, and also unvail clues to how Tenacibaculum infections can be limited or prevented in the future.
Roalkvam, I., Drønen, K. (2016). Two case studies of corrosion from an injection water pipeline in the North Sea: Corrosion control due to operation management and high corrosion potential due to nitrate mitigation, Microbiologically Influenced Corrosion in the Upstream Oil and Gas Industry, editor: Lee, Skovhus and Enning, CRC Press Taylor & Francis, Florida US, ISBN 9781498726566.
Bauer, S.L.M., Roalkvam, I., Steen, I. H., Dahle, H. (2016). Lutibacter profundi sp. nov., isolated from a deep-sea hydrothermal system on the Arctic Mid-Ocean Ridge. International Journal of Systematic and Evolutionary Microbiology, 66:2671-2677.
Steen, I. H., Dahle, H., Stokke, R., Roalkvam, I., Daae, F. L., Rapp, H. T., Pedersen, R. B., Thorseth, I. H. (2016). Novel barite chimneys at the Loki´s Castle Vent Field shed light on key factors shaping microbial communities and functions in hydrothermal systems. Frontiers in Microbiology, doi: 10.3389/fmicb.2015.01510.
Roalkvam, I., Drønen, K., Stokke, R., Daae, F. L., Dahle, H., Steen, I. H. (2015). Physiological and genomic characterization of Arcobacter anaerophilus IR-1 reveals new metabolic features in Epsilonproteobacteria. Frontiers in Microbiology, 6:987.
Roalkvam, I., Bredy, F., Baumberger, T., Pedersen, R. B., Steen, I. H. (2015). Hypnocyclicus thermotrophus gen. nov. sp. nov. isolated from a microbial mat situated in a hydrothermal vent field in the Greenland Sea. International Journal of Systematic and Evolutionary Microbiology, doi:10.1099/ijsem.0.000606.
Hocking, W. P., Roalkvam, I., Magnussen, C., Stokke, R., Steen, I. H. (2015). Assessment of the carbon monoxide metabolism of the hyperthermophilic sulfate-reducing archaeon Archaeoglobus fulgidus VC-16 by comparative transcriptome analyses. Archaea, 2015:12.
Stokke, R., Dahle. H., Roalkvam, I., Wissuwa J., Daae, F. L., Tooming-Klunderud, A., Thorseth, I. H., Pedersen, R. B., Steen, I. H. (2015). Functional interactions among filamentous Epsilonproteobacteria and Bacteroidetes in deep-sea hydrothermal vent biofilm. Environmental Microbiology, doi:10.1111/1462-2920.12970.
Drønen, K., Roalkvam, I., Beeder, J., Torsvik, T., Steen, I. H., Skauge, A., Liengen T. (2014). Modeling of heavy nitrate corrosion in anaerobe aquifer injection water biofilm: a case study in a flow rig. Environmental Science and Technology, 15:8627-35.
Hocking, W. P., Stokke, R., Roalkvam, I., Steen, I. H. (2014). Identification of key components in the energy metabolism of the hyperthermophilic sulfate-reducing archaeon Archaeoglobus fulgidus by transcriptome analyses. Frontiers in Microbiology, 5:95.
Dahle, H., Roalkvam, I., Thorseth, I., Pedersen, R. B., Steen, I. H. (2013). The versatile in situ gene expression of an Epsilonproteobacteria-dominated biofilm from a hydrothermal chimney. Environmental Microbiology Reports, 2:282-90.
Roalkvam, I., Dahle, H., Chen, Y., Jørgensen, S. L., Haflidason, H. & Steen, I. H. (2012). Fine-scale community structure analysis of ANME in Nyegga sediments with high and low methane flux. Frontiers in Extreme Microbiology, 3:216.
Stokke, R., Roalkvam, I., Lanzén, A., Haflidason, H., Steen, I. (2012). Integrated metagenomic and metaproteomic analyses of an ANME-1 dominated community in marine cold-seep sediments. Environmental Microbiology, 13(5):1333-1346.
Roalkvam, I., Jørgensen, S. L., Chen, Y., Stokke, R., Dahle, H., Hocking, W. P., Lanzén, A., Haflidason, H., Steen, I. H. (2011). New insight into stratification of anaerobic methanotrophs in cold seep sediments. FEMS Microbiology Ecology, 78(2):233-43.
2017-: Adapting monitoring tools for bacterial load detection in closed marine fish farms: for improved fish health and reduced mortalities (MONITOR). Funding from Research Council of Norway.
2015-2017: Industrial Applications of Marine Enzymes (INMARE); Innovative screening and expression platforms to discover and use the functional protein diversity from the sea. Funding from the EU Horizon 2020 Program. More info.
2012-2016: Better handling of microbial influenced corrosion during operation. Post. doc project. Fundied by VISTA.
2009-2012: Diversity, stratification and in situ metabolism of anaerobic methanotrophic archaea in Nyegga cold seeps. Ph.D project. Funded by VISTA.