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1 Baran, Roman; Tušer, Michal; Balk, Helge; Blabolil, Petr; Martin, CECH; Drastik, Vladislav; Frouzová, Jaroslava; Juza, Tomas; Koliada, Ievgen; Muška, Milan; SAJDLOVA, Suzana; Vejrik, Lukas; Kubečka, Jan.
Quantification of Chaoborus and small fish by mobile upward-looking echosounding. Journal of limnology 2019 ;Volum 78.(1) s. 60-70
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2 Koliada, Ievgen; Balk, Helge; Tušer, Michal; Ptacek, Ladislav; Kubecka, Jan.
Limitations of target detection in horizontal acoustic surveys of extremely shallow water bodies. Fisheries Research 2019 ;Volum 218. s. 94-104
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3 Mouget, Anne; Goulon, Chloe; Axenrot, Thomas; Balk, Helge; Lebourges-Dhaussy, Anne; Godlewska, Małgorzata; Guillard, Jean.
Including 38 kHz in the standardization protocol for hydroacoustic fish surveys in temperate lakes. Remote Sensing in Ecology and Conservation 2019 ;Volum 5.(4) s. 332-345
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4 Godlewska, Małgorzata; Balk, Helge; Kaczkowski, Zbigniew; Jurczak, Tomasz; Izydorczyk, Katarzyna; Dlugoszewski, Bronislaw; Jaskulska, Aleksandra; Gagala-Borowska, Ilona; Mankiewicz-Boczek, Joanna.
Night fish avoidance of Microcystis bloom revealed by simultaneous hydroacoustic measurements of both organisms. Fisheries Research 2018 ;Volum 207. s. 74-84
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5 Balk, Helge; Søvegjarto, Bendik Sørensen; Tušer, Michal; Froutzova, Jaroslava; Muška, Milan; Drastik, Vladislav; Baran, Roman; Kubecka, Jan.
Surface-induced errors in target strength and position estimates during horizontal acoustic surveys.. Fisheries Research 2017 ;Volum 188. s. 149-156
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6 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.
A novel upward-looking hydroacoustic method for improving pelagic fish surveys. Scientific Reports 2017 ;Volum 7.(1)
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7 Drastik, Vladislav; Godlewska, Małgorzata; Balk, Helge; Clabburn, Peter; Kubečka, Jan; Morrissey, Emma; Hateley, Jon; Winfield, Ian J; Mrkvička, Tomáš; Guillard, Jean.
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 2017 ;Volum 15.(10) s. 836-846
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8 Zhang, Hui; Balk, Helge; Wang, Chengyou; Wu, Jinming; Du, Hao; Shen, Li; Liu, Zhigang; Wei, Qiwei.
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 2016 ;Volum 29.(1)
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9 Kubecka, Jan; Balk, Helge; Roman, Baran; Boswell, Kevin; Froutsova, Jaroslava; Rudstam, Lars G.; Tušer, Michal.
Advances in Shallow Water Hydroacoustics. Standard Methods of Sampling Freshwater Fishes; 2015-08-19 - 2015-08-20
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10 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.
Fish behaviour in response to a midwater trawl footrope in temperate reservoirs. Fisheries Research 2015 ;Volum 172. s. 105-113
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11 Guillard, Jean; Lebourges-Daussy, Anne; Balk, Helge; Colon, Michel; Godlewska, Małgorzata; Jóźwik, Adam.
Comparing hydroacoustic fish stock estimates in the pelagic zone of temperate deep lakes using three sound frequencies (70, 120, 200 kHz). INLAND WATERS 2014 ;Volum 4. s. 435-444
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12 Tuser, Michal; Frouzova, Jaroslava; Balk, Helge; Muska, Milan; Mrkvička, Tomáš; Kubecka, Jan.
Evaluation of potential bias in observing fish with a DIDSON acoustic camera. Fisheries Research 2014 ;Volum 155. s. 114-121
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13 Langkau, M C; Balk, Helge; Schmidt, MB; Borcherding, J.
Can acoustic shadows identify fish species? A novel application of imaging sonar data. Fisheries Management and Ecology 2012 ;Volum 19.(4) s. 313-322
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14 Rakowitz, Georg; Tuser, Michal; Riha, Milan; Juza, Tomas; Balk, Helge; Kubecka, Jan.
Use of high-frequency imaging sonar (DIDSON) to observe fish behaviour towards a surface trawl. Fisheries Research 2012 ;Volum 123. s. 37-48
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15 Järnegren, Johanna; Balk, Helge; Uglem, Ingebrigt; Forseth, Torbjørn.
Telling av oppvandrende fisk i Mandalselva ved bruk av DIDSON. En pilotstudie. Trondheim: Norsk institutt for naturforskning 2011 (ISBN 978-82-426-2215-0) 22 s. NINA rapport(636)
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16 Tuser, Michael; Balk, Helge; Mrkvička, Tomáš; Frouzova, Jaroslava; Čech, Martin; Muska, Milan; Kubecka, Jan.
Validation of current acoustic dead-zone estimation methods in lakes with strongly sloped bottoms. Limnology and Oceanography : Methods 2011 ;Volum 9. s. 507-514
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17 Balk, Helge; Kubecka, Jan; Lindem, Torfinn.
Detection, tracking and sizing of fish in data from DIDSON multibeam sonars. 33rd Scandinavian symposium on physical acoustics; 2010-02-07 - 2010-07-10
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18 Rakowitz, Georg; Tuser, Michal; Riha, Milan; Balk, Helge; Kubecka, Jan.
Use of high-frequency imaging sonar to observe fish behaviour with respect to an active surface trawl. FSAMLR 2010; 2010-09-07 - 2010-09-12
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19 Balk, Helge; Lindem, Torfinn.
Target detection in data from splitbeam echosounders and multi beam sonar systems. Kveldssminar; 2009-03-02
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20 Balk, Helge; Lindem, Torfinn; Kubecka, Jan.
New Cubic Cross filter detector for multi beam data recorded with DIDSON acoustic camera. UNDERWATER ACOUSTIC MEASUREMENTS: TECHNOLOGIES AND RESULTS; 2009-06-21
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21 Drastik, Vladislav; Hohausova, Eva; Kubecka, Jan; Balk, Helge; Froutsova, Jaroslava.
Classification of fish and plant echoes in acoustic surveys. Symposium on the Echosystem Approach with Fisheries Acoustics and Complementary Technologies (SEAFACTS); 2009-06-15
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22 Kubecka, Jan; Frouzova, Jaroslava; Balk, Helge; Čech, Martin; Draštík, Vladislav; Prchalová, Marie.
REGRESSIONS FOR CONVERSION BETWEEN TARGET STRENGTH AND FISH LENGTH IN HORIZONTAL ACOUSTIC SURVEYS. Underwater Acoustic Measurements - Technologies & Results" 3rd International Conference & Exhibition"; 2009-06-21
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23 Schmidt, MB; Balk, Helge; Gassner, H.
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 2009 ;Volum 16.(5) s. 376-385
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24 Jurvelius, Juha; Knudsen, Frank R.; Balk, Helge; Marjomäki, Timo J.; Peltonen, Heikki; Taskinen, Jouni; Tuomaala, Antti; Viljanen, Markku.
Echo-sounding can discriminate between fish and macroinvertebrates in fresh water. Freshwater Biology 2008 ;Volum 53.
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25 Rudstam, Lars G.; Knudsen, Frank R.; Balk, Helge; Gal, Gideon; Boscarino, Brent T.; Axenrot, Thomas.
Acoustic characterization of Mysis relicta at multiple frequencies. Canadian Journal of Fisheries and Aquatic Sciences 2008 ;Volum 65.(12) s. 2769-2779
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26 Balk, Helge; Lindem, Torfinn.
Analysis and visualization of data from DIDSON Acoustic camera. 31-th Scandinavian symposium on Physical Acoustics; 2008-01-27
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27 Balk, Helge; Lindem, Torfinn; Kubecka, Jan.
Split beam versus multi beam for monitoring migrating fish in rivers and shallow lakes. ICES Symposium on the Ecosystem Approach with Fisheries Acoustics and Complementary Technologies; 2008-06-15 - 2008-06-20
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28 Froutzova, Jaroslava; Kubecka, Jan; Balk, Helge.
Fat echoes of oblique aspects : consequences for fish single echo detection. Symposium on the Echosystem Approach with Fisheries Acoustics and Complementary Technologies (SEAFACTS); 2008-06-15
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29 George, Rakowitz; Keckeis, Wolfgang; Herold, Wolfgang; Kubecka, Jan; Balk, Helge.
Evaluation of different fish size estimators in horizontal acoustic applications. Symposium on the Echosystem Approach with Fisheries Acoustics and Complementary Technologies (SEAFACTS); 2008-06-15
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30 Gjelland, Karl Øystein; Knudsen, Frank; Balk, Helge.
Bias in swimming speed estimates from splitbeam acoustics should be corrected for with smoothing. Symposium on the Echosystem Approach with Fisheries Acoustics and Complementary Technologies (SEAFACTS); 2008-06-15
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31 Hohausova, E; Kubecka, J; Frouzova, J; Husak, S; Balk, Helge.
Experimental biomass assessment of three species of freshwater aquatic plants by horizontal acoustics. Journal of aquatic plant management 2008 ;Volum 46.
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32 Kubecka, Jan; Balk, Helge; Drastic, Vladislav; Frouzova, Jaroslava; Gassner, Hubert; Herzig, Alois; Jarolim, Oldoich; Juza, Tomas; Kratochvil, Michael; Vasek, Mojmir.
Large-scale acoustic surveys of an extremely shallow lake: Neusiedler See, Austria. Symposium on the Echosystem Approach with Fisheries Acoustics and Complementary Technologies (SEAFACTS); 2008-06-15 - 2008-06-21
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33 Rakowitz, G; Herold, W; Fesl, C; Keckeis, H; Kubecka, J; Balk, Helge.
Two methods to improve the accuracy of target-strength estimates for horizontal beaming. Fisheries Research 2008 ;Volum 93.(3) s. 324-331
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34 Tuser, Michael; Balk, Helge; Froutsova, Jaroslava; Kubecka, Jan; Muska, Milan.
Suitability of DIDSON acoustic camera for quantitative fish stock assessment by mobile surveys. Symposium on the Echosystem Approach with Fisheries Acoustics and Complementary Technologies (SEAFACTS); 2008-06-15
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35 Rudstam, Lars G.; Gal, Gideon; Balk, Helge; Knudsen, Frank R.; Axenrot, Thomas; Boscarino, Brent.
Multiple acoustic frequencies increase our ability to discriminate between fish, mysids and zooplankton. IAGLR 2007; 2007-05-28 - 2007-06-01
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36 Balk, Helge; Lindem, Torfinn.
Analysis of data from high frequency identification sonars combined with data from conventional echo-sounders. DIDSON workshop in Vienna 2007; 2007-04-14
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37 Balk, Helge; Lindem, Torfinn; Kubecka, Jan; Frank, Knudsen.
Recent advances in solving signal-to-noise problems in fisheries acoustics. FSAMLR07; 2007-09-10 - 2007-09-15
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38 Balk, Helge; Lindem, Torfinn; Kubecka, Jan.
Enhenced Crossfilter detector for target detection in data from echosounders. 29th SCANDINAVIAN SYMPOSIUM ON PHYSICAL ACOUSTICS; 2006-01-29 - 2006-02-01
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39 Balk, Helge.
Introduction, presentation and theory for multifrequency hydroacoustics. Multi frequency workshop at Cornell University; 2006-08-26 - 2006-09-03
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40 Balk, Helge.
Sound waves and fish abundance. Organisert for ledende personer av og for CSIRO; 2006-06-05 - 2006-06-05
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41 Balk, Helge.
Sound waves and fish abundance. Invited for a lecture series; 2006-05-29 - 2006-05-29
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42 Balk, Helge.
A Ph. D. Class on Marine Bioacoustics: Hydroacoustics. A Ph. D. Class on Marine Bioacoustics; 2005-05-29 - 2005-06-08
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43 Balk, Helge.
Lineær kretselektronikk. Fysisk Institutt: Helge Balk 2005 (ISBN 00-000-0000-0) 305 s.
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44 Balk, Helge.
New methods for fish and bottom detection in data from split beam echosounders. Seminar arrange by Ifremer, IRD and INRA; 2005-07-27 - 2005-07-29
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45 Balk, Helge; Lindem, Torfinn; Kubecka, Jan.
New single echo detection methods for shallow water fisheries acoustics. 135th Annual Meeting; 2005-09-11 - 2005-09-15
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46 Balk, Helge; Lindem, Torfinn; Kubecka, Jan.
New single echo detection methods for shallow water fishery acoustics. 149'th Meeting of the Acoustical Society of America; 2005-05-15 - 2005-05-20
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47 Frouzova, J; Kubecka, J; Balk, Helge; Frouz, J.
Target strength of some European fish species and its dependence on fish body parameters. Fisheries Research 2005 ;Volum 75. s. 86-96
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48 Peltonen, H; Balk, Helge.
The acoustic target strength of herring (Clupea harengus L.) in the northern Baltic Sea. ICES Journal of Marine Science 2005 ;Volum 62. s. 803-808
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49 Balk, Helge.
Presentation of research results. Advanced analysis methods for fisheries acoustics. Detection methods for data characterised with low signal to noise ration. Workshop on hydroacoustic methods; 2004-03-31 - 2004-04-04
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50 Balk, Helge.
Reflection and diffraction of sound waves in shallow water and how this influences the sonar equations. Swedish acoustic meeting; 2004-10-25 - 2004-10-26
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