Helge Balk

Associate Professor - Electronics
Image of Helge Balk
Norwegian version of this page
Phone +47-22856489
Mobile phone +47-97772401 97772401
Visiting address Sem Sælands vei 24 Fysikkbygningen 0371 OSLO
Postal address Postboks 1048 Blindern 0316 OSLO

Personal homepage

Academic Interests


Higher education and employment history

  • 2002..2003   Pedagogic
  • 2001..           Ass proff.
  • 1997.. 2001  Phd  / hydroacoustics UiO
  • 1994 ..1996  Master  measureing tehchnique / electronics  UiO
  • 1992..1994   Bachelor  Physics  UiO
  • 1988..1992   Bachelor mathematical muduling  UiO- Informatics
  • 1986..1988   Norsk Hydro VAX operator
  • 1981..1986   Serviceleader Nortrade Elektronics
  • 1977..1980   Analog electronic educvation from Bleiker / Ruud


  • Leader of the PhD-Commitee
  • Member of the Study-Lecturing and Research Commitee


  • Balk, Helge; Søvegjarto, Bendik Sørensen; Tušer, Michal; Froutzova, Jaroslava; Muška, Milan; Drastik, Vladislav; Baran, Roman & Kubecka, Jan (2017). Surface-induced errors in target strength and position estimates during horizontal acoustic surveys.. Fisheries Research.  ISSN 0165-7836.  188, s 149- 156 . doi: 10.1016/j.fishres.2016.12.017
  • Baran, Roman; Juza, Tomas; Tušer, Michal; Balk, Helge; Blabolil, Petr; Cech, Martin; Drastik, Vladislav; Frouzová, Jaroslava; Jayasinghe, Asanka D; Koliada, Ievgen; Mrkvička, Tomáš; Muška, Milan; Ricard, Daniel; Sajdlová, Zuzana; Vejrik, Lukas & Kubečka, Jan (2017). A novel upward-looking hydroacoustic method for improving pelagic fish surveys. Scientific Reports.  ISSN 2045-2322.  7(1) . doi: 10.1038/s41598-017-04953-6
  • Drastik, Vladislav; Godlewska, Małgorzata; Balk, Helge; Clabburn, Peter; Kubečka, Jan; Morrissey, Emma; Hateley, Jon; Winfield, Ian J; Mrkvička, Tomáš & Guillard, Jean (2017). Fish hydroacoustic survey standardization: A step forward based on comparisons of methods and systems from vertical surveys of a large deep lake. Limnology and Oceanography : Methods.  ISSN 1541-5856.  15(10), s 836- 846 . doi: 10.1002/lom3.10202
  • Zhang, Hui; Balk, Helge; Wang, Chengyou; Wu, Jinming; Du, Hao; Shen, Li; Liu, Zhigang & Wei, Qiwei (2016). Search for Chinese paddlefish (Psephurus gladius) in the upper Yangtze River during 2009-2013 including reevaluation of data from 2006 to 2008. Aquatic Living Resources.  ISSN 0990-7440.  29(1) . doi: 10.1051/alr/2016008
  • Sajdlová', Zuzana; Draštík, Vladislav; Jůza, Tomáš; Říha, Milan; Frouzová, Jaroslava; Čech, Martin; Vašek, Mojmír; Muška, Milan; Blabolil, Petr; Tušer, Michal; Kratochvíl, Michal; Peterka, Jiří; Mrkvička, Tomáš; Balk, Helge & Kubečka, Jan (2015). Fish behaviour in response to a midwater trawl footrope in temperate reservoirs. Fisheries Research.  ISSN 0165-7836.  172, s 105- 113 . doi: 10.1016/j.fishres.2015.06.025
  • Guillard, Jean; Lebourges-Daussy, Anne; Balk, Helge; Colon, Michel; Godlewska, Małgorzata & Jóźwik, Adam (2014). Comparing hydroacoustic fish stock estimates in the pelagic zone of temperate deep lakes using three sound frequencies (70, 120, 200 kHz). INLAND WATERS.  ISSN 2044-2041.  4, s 435- 444 . doi: 10.5268/IW-4.4.733
  • Tuser, Michal; Frouzova, Jaroslava; Balk, Helge; Muska, Milan; Mrkvička, Tomáš & Kubecka, Jan (2014). Evaluation of potential bias in observing fish with a DIDSON acoustic camera. Fisheries Research.  ISSN 0165-7836.  155, s 114- 121 . doi: 10.1016/j.fishres.2014.02.031
  • Langkau, M C; Balk, Helge; Schmidt, MB & Borcherding, J (2012). Can acoustic shadows identify fish species? A novel application of imaging sonar data. Fisheries Management and Ecology.  ISSN 0969-997X.  19(4), s 313- 322 . doi: 10.1111/j.1365-2400.2011.00843.x
  • Rakowitz, Georg; Tuser, Michal; Riha, Milan; Juza, Tomas; Balk, Helge & Kubecka, Jan (2012). Use of high-frequency imaging sonar (DIDSON) to observe fish behaviour towards a surface trawl. Fisheries Research.  ISSN 0165-7836.  123, s 37- 48 . doi: 10.1016/j.fishres.2011.11.018
  • Tuser, Michael; Balk, Helge; Mrkvička, Tomáš; Frouzova, Jaroslava; Čech, Martin; Muska, Milan & Kubecka, Jan (2011). Validation of current acoustic dead-zone estimation methods in lakes with strongly sloped bottoms. Limnology and Oceanography : Methods.  ISSN 1541-5856.  9, s 507- 514 . doi: 10.4319/lom.2011.9.507
  • Schmidt, MB; Balk, Helge & Gassner, H (2009). Testing in situ avoidance reaction of vendace, Coregonus albula, in relation to continuous artificial light from stationary vertical split-beam echosounding. Fisheries Management and Ecology.  ISSN 0969-997X.  16(5), s 376- 385 . doi: 10.1111/j.1365-2400.2009.00689.x
  • Jurvelius, Juha; Knudsen, Frank R.; Balk, Helge; Marjomäki, Timo J.; Peltonen, Heikki; Taskinen, Jouni; Tuomaala, Antti & Viljanen, Markku (2008). Echo-sounding can discriminate between fish and macroinvertebrates in fresh water. Freshwater Biology.  ISSN 0046-5070.  53 . doi: 10.1111/j.1365-2427.2007.01944.x Show summary
  • Rudstam, Lars G.; Knudsen, Frank R.; Balk, Helge; Gal, Gideon; Boscarino, Brent T. & Axenrot, Thomas (2008). Acoustic characterization of Mysis relicta at multiple frequencies. Canadian Journal of Fisheries and Aquatic Sciences.  ISSN 0706-652X.  65(12), s 2769- 2779 . doi: 10.1139/Fo8-179 Show summary
  • Hohausova, E; Kubecka, J; Frouzova, J; Husak, S & Balk, Helge (2008). Experimental biomass assessment of three species of freshwater aquatic plants by horizontal acoustics. Journal of aquatic plant management.  ISSN 0146-6623.  46
  • Rakowitz, G; Herold, W; Fesl, C; Keckeis, H; Kubecka, J & Balk, Helge (2008). Two methods to improve the accuracy of target-strength estimates for horizontal beaming. Fisheries Research.  ISSN 0165-7836.  93(3), s 324- 331 . doi: 10.1016/j.fishres.2008.06.005
  • Frouzova, J; Kubecka, J; Balk, Helge & Frouz, J (2005). Target strength of some European fish species and its dependence on fish body parameters. Fisheries Research.  ISSN 0165-7836.  75, s 86- 96
  • Peltonen, H & Balk, Helge (2005). The acoustic target strength of herring (Clupea harengus L.) in the northern Baltic Sea. ICES Journal of Marine Science.  ISSN 1054-3139.  62, s 803- 808
  • Balk, Helge & Lindem, Torfinn (2000). Improved fish detection in data from split-beam sonar. Aquatic Living Resources.  ISSN 0990-7440.  13, s 297- 303 Show summary

View all works in Cristin

  • Balk, Helge (2005). Lineær kretselektronikk. Helge Balk.  ISBN 00-000-0000-0.  305 s. Show summary

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  • Kubecka, Jan; Balk, Helge; Roman, Baran; Boswell, Kevin; Froutsova, Jaroslava; Rudstam, Lars G. & Tušer, Michal (2015). Advances in Shallow Water Hydroacoustics.
  • Järnegren, Johanna; Balk, Helge; Uglem, Ingebrigt & Forseth, Torbjørn (2011). Telling av oppvandrende fisk i Mandalselva ved bruk av DIDSON. En pilotstudie. NINA rapport. 636. Show summary
  • Balk, Helge; Kubecka, Jan & Lindem, Torfinn (2010). Detection, tracking and sizing of fish in data from DIDSON multibeam sonars.
  • Rakowitz, Georg; Tuser, Michal; Riha, Milan; Balk, Helge & Kubecka, Jan (2010). Use of high-frequency imaging sonar to observe fish behaviour with respect to an active surface trawl.
  • Balk, Helge & Lindem, Torfinn (2009). Target detection in data from splitbeam echosounders and multi beam sonar systems.
  • Balk, Helge; Lindem, Torfinn & Kubecka, Jan (2009). New Cubic Cross filter detector for multi beam data recorded with DIDSON acoustic camera. Show summary
  • Drastik, Vladislav; Hohausova, Eva; Kubecka, Jan; Balk, Helge & Froutsova, Jaroslava (2009). Classification of fish and plant echoes in acoustic surveys. Show summary
  • Kubecka, Jan; Frouzova, Jaroslava; Balk, Helge; Čech, Martin; Draštík, Vladislav & Prchalová, Marie (2009). REGRESSIONS FOR CONVERSION BETWEEN TARGET STRENGTH AND FISH LENGTH IN HORIZONTAL ACOUSTIC SURVEYS. Show summary
  • Balk, Helge & Lindem, Torfinn (2008). Analysis and visualization of data from DIDSON Acoustic camera.
  • Balk, Helge; Lindem, Torfinn & Kubecka, Jan (2008). Split beam versus multi beam for monitoring migrating fish in rivers and shallow lakes.
  • Froutzova, Jaroslava; Kubecka, Jan & Balk, Helge (2008). Fat echoes of oblique aspects : consequences for fish single echo detection. Show summary
  • George, Rakowitz; Keckeis, Wolfgang; Herold, Wolfgang; Kubecka, Jan & Balk, Helge (2008). Evaluation of different fish size estimators in horizontal acoustic applications. Show summary
  • Gjelland, Karl Øystein; Knudsen, Frank & Balk, Helge (2008). Bias in swimming speed estimates from splitbeam acoustics should be corrected for with smoothing. Show summary
  • Kubecka, Jan; Balk, Helge; Drastic, Vladislav; Frouzova, Jaroslava; Gassner, Hubert; Herzig, Alois; Jarolim, Oldoich; Juza, Tomas; Kratochvil, Michael & Vasek, Mojmir (2008). Large-scale acoustic surveys of an extremely shallow lake: Neusiedler See, Austria. Show summary
  • Tuser, Michael; Balk, Helge; Froutsova, Jaroslava; Kubecka, Jan & Muska, Milan (2008). Suitability of DIDSON acoustic camera for quantitative fish stock assessment by mobile surveys. Show summary
  • Rudstam, Lars G.; Gal, Gideon; Balk, Helge; Knudsen, Frank R.; Axenrot, Thomas & Boscarino, Brent (2007). Multiple acoustic frequencies increase our ability to discriminate between fish, mysids and zooplankton. Show summary
  • Balk, Helge & Lindem, Torfinn (2007). Analysis of data from high frequency identification sonars combined with data from conventional echo-sounders. Show summary
  • Balk, Helge; Lindem, Torfinn; Kubecka, Jan & Frank, Knudsen (2007). Recent advances in solving signal-to-noise problems in fisheries acoustics. Show summary
  • Balk, Helge; Lindem, Torfinn & Kubecka, Jan (2006). Enhenced Crossfilter detector for target detection in data from echosounders. Show summary
  • Balk, Helge (2006). Introduction, presentation and theory for multifrequency hydroacoustics.
  • Balk, Helge (2006). Sound waves and fish abundance.
  • Balk, Helge (2006). Sound waves and fish abundance. Show summary
  • Balk, Helge (2005). A Ph. D. Class on Marine Bioacoustics: Hydroacoustics.
  • Balk, Helge (2005). New methods for fish and bottom detection in data from split beam echosounders.
  • Balk, Helge; Lindem, Torfinn & Kubecka, Jan (2005). New single echo detection methods for shallow water fisheries acoustics. Show summary
  • Balk, Helge; Lindem, Torfinn & Kubecka, Jan (2005). New single echo detection methods for shallow water fishery acoustics. Show summary
  • Balk, Helge (2004). Presentation of research results. Advanced analysis methods for fisheries acoustics. Detection methods for data characterised with low signal to noise ration.
  • Balk, Helge (2004). Reflection and diffraction of sound waves in shallow water and how this influences the sonar equations.
  • Balk, Helge & Lindem, Torfinn (2003). Fish detection based on spectral differences in the echogram's range and temporal domain.
  • Balk, Helge & Lindem, Torfinn (2003). A new method for single target detection. Show summary
  • Balk, Helge & Lindem, Torfinn (2002). Fish detection in rivers with split-beam sonars. Show summary
  • Lindem, Torfinn; Balk, Helge; Vibeke, J. & Kjølerbakken, K. M. (2002). Measurements of acoustic sound fields in a shallow river. Show summary
  • Balk, Helge (2001). Development of hydroacoustic methods for fish detection in shallow water. Show summary
  • Lindem, Torfinn; Balk, Helge & Knudsen, Frank R. (1999). Sound propagation through shallow water can make unexpected modification to fish echoes recorded with a horizontally looking split beam system. Show summary
  • Balk, Helge & Lindem, Torfinn (1999). Fish tracking in shallow water by image processing. Show summary
  • Lindem, Torfinn & Balk, Helge (1999). Problems related to Time Varied Gain (TVG) and phase measurements with elliptic split beam transducers in shallow water, - some observations. Show summary
  • Balk, Helge & Lindem, Torfinn (1998). Hydroacoustic fish counting in rivers and shallow waters, with focus on problems related to tracking in horizontal scanning sonars.

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Published Nov. 4, 2010 12:08 PM - Last modified Oct. 15, 2013 12:27 PM

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