Ole-Kristian Hess-Erga
Position: Senior Research Scientist, PhD
Phone: +47 979 73 054
Ole-Kristian Hess-Erga is a microbial ecologist (PhD) from the Norwegian University for Science and Technology (NTNU) and employed as a research scientist at NIVA, Section for Fish Ecology and Aquaculture. Ole-Kristian is specialized in microbial ecology and water treatment, and has been working with the effects of disinfection, decomposition of organic matter, bacterial recolonization, and small-scale aquaculture since 2005. His work has focussed both on intensive aquaculture (biology and technology) and ballast water treatment. Ole-Kristian has additional experience from offshore work and shipping.

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Scientific articles and Bookchapters

  1. Hess-Erga, Ole-Kristian; Moreno-Andrés, Javier; Enger, Øivind; Vadstein, Olav; (2019) Microorganisms in ballast water: Disinfection, community dynamics, and implications for management. Science of the Total Environment ISSN 0048-9697. Vol 657 s704-716 doi: 10.1016/j.scitotenv.2018.12.004
  2. Peperzak, Louis; Zetsche, Eva-Maria; Gollasch, Stephan; Artigas, Luis Felipe; Bonato, Simon; Créach, Véronique; Vré, Pieter de; Dubelaar, George B.J.; Henneghien, Joël; Hess-Erga, Ole-Kristian; Langelaar, Roland; Larsen, Aud; Maurer, Brian N; Mosselaar, Albert; Reavie, Euan D; Rijkeboer, Machteld; Tobiesen, August; (2018) Comparing flow cytometry and microscopy in the quantification of vital aquatic organisms in ballast water. Journal of Marine Engineering & Technology ISSN 2046-4177. doi: 10.1080/20464177.2018.1525806
  3. Hoell, Ingunn; Olsen, Ranveig Ottøy; Hess-Erga, Ole-Kristian; Thuestad, Gunnar; Larsen, Aud; (2017) Application of flow cytometry in ballast water analysis - biological aspects. Management of Biological Invasions ISSN 1989-8649. Vol 8 No4 s575-588 doi: 10.3391/mbi.2017.8.4.13
  4. Olsen, Ranveig Ottøy; Hoffmann, Friederike; Hess-Erga, Ole-Kristian; Larsen, Aud; Thuestad, Gunnar; Hoell, Ingunn; (2016) Ultraviolet radiation as a ballast water treatment strategy: Inactivation of phytoplankton measured with flow cytometry. Marine Pollution Bulletin ISSN 0025-326X. Vol 103 No1-2 s270-275 doi: 10.1016/j.marpolbul.2015.12.008
  5. Olsen, Ranveig Ottøy; Hess-Erga, Ole-Kristian; Larsen, Aud; Hoffmann, Friederike; Thuestad, Gunnar; Hoell, Ingunn Alne; (2016) Dual staining with CFDA-AM and SYTOX Blue in flow cytometry analysis of UV-irradiated Tetraselmis suecica to evaluate vitality. Aquatic Biology ISSN 1864-7782. Vol 25 s39-52 doi: 10.3354/ab00662
  6. Olsen, Ranveig Ottøy; Hess-Erga, Ole-Kristian; Larsen, Aud; Thuestad, Gunnar; Tobiesen, August E.Dessen; Hoell, Ingunn; (2015) Flow cytometric applicability to evaluate UV inactivation of phytoplankton in marine water samples. Marine Pollution Bulletin ISSN 0025-326X. Vol 96 No1-2 s279-285 doi: 10.1016/j.marpolbul.2015.05.012
  7. Hess-Erga, Ole-Kristian; Blomvågnes-Bakke, Bente; Vadstein, Olav; (2010) Recolonization by heterotrophic bacteria after UV irradiation or ozonation of seawater; a simulation of ballast water treatment. Water Research ISSN 0043-1354. Vol 44 No18 s5439-5449 doi: 10.1016/j.watres.2010.06.059
  8. Hess-Erga, Ole-Kristian; Attramadal, Kari; Vadstein, Olav; (2008) Biotic and abiotic particles protect marine heterotrophic bacteria during UV and ozone disinfection. Aquatic Biology ISSN 1864-7782. Vol 4 No2 s147-154 doi: 10.3354/ab00105
NIVA began to register scientific articles in CRIStin in 2010, reports from 2014.