Academic article

• Krafft, Bjørn Arne; Krag, Ludvig A.; Pedersen, Ronald et al. (2023). Antarctic krill (Euphausia superba) catch weight estimated with a trawl-mounted echosounder during fishing. (external link)
• Andersen, Lars Nonboe; Chu, Dezhang; Handegard, Nils Olav et al. (2023). Quantitative processing of broadband data as implemented in a scientific split-beam echosounder. (external link)
• Khodabandeloo, Babak; Ona, Egil; Pedersen, Geir et al. (2022). Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements. (external link)
• Ona, Egil; Nielsen, Julius (2022). Acoustic detection of the Greenland shark (Somniosus microcephalus) using multifrequency split beam echosounder in Svalbard waters. (external link)
• Khodabandeloo, Babak; Ona, Egil; Macaulay, Gavin et al. (2021). Nonlinear crosstalk in broadband multi-channel echosounders. (external link)
• Snoeijs-Leijonmalm, Pauline; Gjøsæter, Harald; Ingvaldsen, Randi Brunvær et al. (2021). A deep scattering layer under the North Pole pack ice. (external link)
• Pena, Hector; Macaulay, Gavin; Ona, Egil et al. (2021). Estimating individual fish school biomass using digital omnidirectional sonars, applied to mackerel and herring. (external link)
• Bernardes, Inês Dias; Ona, Egil; Gjøsæter, Harald (2020). Study of the Arctic mesopelagic layer with vessel and profiling multifrequency acoustics. (external link)
• Kubilius, Rokas; Macaulay, Gavin; Ona, Egil (2020). Remote sizing of fish-like targets using broadband acoustics. (external link)
• Macaulay, Gavin; Chu, Dezhang; Ona, Egil (2020). Field measurements of acoustic absorption in seawater from 38 to 360 kHz. (external link)
• Ona, Egil; Zhang, Guosong; Pedersen, Geir et al. (2020). In situ calibration of observatory broadband echosounders. (external link)
• Macaulay, Gavin; Schoulding, Ben; Ona, Egil et al. (2018). Comparisons of echo-integration performance from two multiplexed echosounders. (external link)
• Johnsen, Espen; Rieucau, Guillaume; Ona, Egil et al. (2017). Collective structures anchor massive schools of lesser sandeel to the seabed, increasing vulnerability to fishery. (external link)
• Ingvaldsen, Randi Brunvær; Gjøsæter, Harald; Ona, Egil et al. (2017). Atlantic cod (Gadus morhua)feeding over deep water in the high Arctic. (external link)
• Vatnehol, Sindre; Pena, Hector; Ona, Egil (2017). Estimating the volumes of fish schools from observations with multi-beam sonars. (external link)
• Vatnehol, Sindre; Ona, Egil (2017). Evaluation of target angular position algorithms for multi-beam fishery sonars. (external link)
• Macaulay, Gavin; Vatnehol, Sindre; Gammelsæter, Ole Bernt et al. (2016). Practical calibration of ship-mounted omni-directional fisheries sonars. (external link)
• Vatnehol, Sindre; Totland, Atle; Ona, Egil (2016). Two mechanical rigs for field calibration of multi-beam fishery sonars. (external link)
• Scoulding, Ben; Chu, Dezhang; Ona, Egil et al. (2015). Target strengths of two abundant mesopelagic fish species. (external link)
• Kubilius, Rokas; Ona, Egil; Calise, Lucio (2015). Measuring in situ krill tilt orientation by stereo photogrammetry: Examples for Euphausia superba and Meganyctiphanes norvegica. (external link)
• Godø, Olav Rune; Handegard, Nils Olav; Browman, Howard et al. (2014). Marine ecosystem acoustics (MEA): Quantifying processes in the sea at the spatio-temporal scales on which they occur. (external link)
• Forland, Tonje Nesse; Hobæk, Halvor; Ona, Egil et al. (2014). Broad bandwidth acoustic backscattering from sandeel - measurements and finite element simulations. (external link)
• Shabangu, Fannie W.; Ona, Egil; Yemane, Dawit (2014). Measurements of acoustic attenuation at 38kHz by wind-induced air bubbles with suggested correction factors for hull-mounted transducers. (external link)
• Macaulay, Gavin; Pena, Hector; Fässler, Sacha M.M. et al. (2013). Accuracy of the Kirchhoff-approximation and Kirchhoff-ray-mode fish swimbladder acoustic scattering models. (external link)
• Pena, Hector; Handegard, Nils Olav; Ona, Egil (2013). Feeding herring schools do not react to seismic air gun surveys. (external link)
• Løkkeborg, Svein; Ona, Egil; Vold, Aud et al. (2012). Effects of Sounds From Seismic Air Guns on Fish Behavior and Catch Rates. (external link)
• Løkkeborg, Svein; Ona, Egil; Vold, Aud et al. (2012). Sounds from seismic air guns: gear- and species-specific effects on catch rates and fish distribution. (external link)
• Kubilius, Rokas; Ona, Egil (2012). Target strength and tilt-angle distribution of the lesser sandeel (Ammodytes marinus). (external link)
• Pedersen, Geir; Godø, Olav Rune; Ona, Egil et al. (2011). A revised target strength-length estimate for blue whiting (Micromesistius poutassou): implications for biomass estimates. (external link)
• Løkkeborg, Svein; Ona, Egil; Vold, Aud et al. (2010). Effekter av seismiske undersøkelser på fiskefordeling og fangstrater for garn og line i Vesterålen sommeren 2009. (external link)
• Wiebe, Peter H.; Chu, Dezhang; Kaartvedt, Stein et al. (2010). The acoustic properties of Salpa thompsoni. (external link)
• Patel, Ruben; Ona, Egil (2009). Measuring herring densities with one real and several phantom research vessels. (external link)
• Pedersen, Geir; Handegard, Nils Olav; Ona, Egil (2009). Lateral-aspect, target-strength measurements of in situ herring (Clupea harengus). (external link)
• Totland, Atle; Johansen, Geir Odd; Godø, Olav Rune et al. (2009). Quantifying and reducing the surface blind zone and the seabed dead zone using new technology. (external link)
• Johnsen, Espen; Pedersen, Ronald; Ona, Egil (2009). Size-dependent frequency response of sandeel schools. (external link)
• Ona, Egil; Mazauric, Valerie; Andersen, Lars Nonboe (2009). Calibration methods for two scientific multibeam systems. (external link)
• Harbitz, Alf; Ona, Egil; Pennington, Michael Robert (2009). The use of an adaptive acoustic-survey design to estimate the abundance of highly skewed fish populations. (external link)
• Patel, Ruben; Pedersen, Geir; Ona, Egil (2009). Inferring the acoustic dead-zone volume by split-beam echo sounder with narrow-beam transducer on a noninertial platform. (external link)
• Løland, Anders; Aldrin, Magne; Ona, Egil et al. (2007). Estimating and decomposing total uncertainty for survey-based abundance estimates of Norwegian spring-spawning herring. (external link)
• Knudsen, Frank Reier; Fosseidengen, Jan Erik; Oppedal, Frode et al. (2004). Hydroacoustic monitoring of fish in sea cages: target strength (TS) measurements on Atlantic salmon (Salmo salar). (external link)
• Engås, Arill; Løkkeborg, Svein; Soldal, Aud vold et al. (1996). Comparative fishing trials for cod and haddock using commercial trawl and longline at two different stock levels. (external link)
• Engås, Arill; Løkkeborg, Svein; Ona, Egil et al. (1996). Effects of seismic shooting on local abundance and catch rates of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus). (external link)
• Misund, Ole Arve; Aglen, Asgeir; Hamre, Johannes et al. (1996). Improved mapping of schooling fish near the surface: comparison of abundance estimates obtained by sonar and echo integration. (external link)
• Foote, Kenneth; Ona, Egil; Toresen, Reidar (1992). Determining the extinction cross section of aggregating fish. (external link)

Poster

• Ona, Egil; Zhang, Guosong; Vatnehol, Sindre et al. (2023). Direct measurements of the migration speed of spawning herring. (external link)
• Gjøsæter, Harald; Wiebe, Peter H.; Ona, Egil et al. (2016). Does an acoustic deep scattering layer show diel vertical migration in the Arctic?. (external link)
• Macaulay, Gavin; Ona, Egil; Kubilius, Rokas (2015). Traceable calibration of calibration spheres. (external link)
• Isaksen, Bjørnar; Saltskår, Jostein; Vold, Aud et al. (2012). Minimising ‘Slipping’ Mortality in Purse Seine Fisheries. (external link)
• Pedersen, Rolf Birger; Thorseth, Ingunn Hindenes; Knudsen, H.P et al. (2007). The 71N vent fields at the Arctic Mid-Ocean Ridge. (external link)
• Fosså, Jan Helge; Kjerstad, Norvald; Woll, Astrid Kari et al. (1996). Acoustic biomass estimats of seaweed (Laminaria Hyperborea). (external link)

Academic lecture

• Khodabandeloo, Babak; Ona, Egil; Macaulay, Gavin et al. (2022). Acoustically induced nonlinear crosstalk in broadband echosounders. (external link)
• Andersen, Lars N; Chu, Dezhang; Handegard, Nils Olav et al. (2022). Quantitative processing of broadband data as implemented in a scientific split-beam echosounder. (external link)
• Khodabandeloo, Babak; Ona, Egil; Pedersen, Geir et al. (2022). Gas-baldder elongation estimation of mesopelagic organisms from wideband target strength frequency response. (external link)
• Khodabandeloo, Babak; Ona, Egil; Macaulay, Gavin et al. (2021). Nonlinear higher harmonics and crosstalk in broadband multi-channels echosounders. (external link)
• Ona, Egil (2021). Echo sounder developments during my scientific life, - from EK38 to EK80, some significant steps. (external link)
• Ona, Egil; Zhang, Guosong; Handegard, Nils Olav et al. (2021). Direct measurements of the migration speed of spawning herring. (external link)
• Handegard, Nils Olav; Forland, Tonje Nesse; Johnsen, Espen et al. (2021). CRIMAC - Center for Research-based Innovation in Marine Acoustic Abundance Estimation and Backscatter Classification. (external link)
• Vold, Aud; Breen, Michael; Ona, Egil et al. (2019). CRISP - eight years of innovation in fisheries technology. (external link)
• Kubilius, Rokas; Macaulay, Gavin; Ona, Egil et al. (2019). Broadband backscattering from tethered Atlantic mackerel. (external link)
• Johnsen, Espen; Totland, Atle; Kubilius, Rokas et al. (2019). Acoustic measurements of herring close to the sea surface. (external link)
• Kubilius, Rokas; Ona, Egil; Macaulay, Gavin et al. (2018). Broadband backscattering from artificial fish-like targets. (external link)
• Ona, Egil; Kubilius, Rokas (2018). Target strenght of spawning herring.. (external link)
• Ona, Egil (2018). From single-beam acoustics to wideband analysis; can we study biology with new tools?. (external link)
• Ona, Egil (2018). Acoustic tools: New methods enable efficient mapping of mesopelagic fish aggregations. (external link)
• Tenningen, Maria; Vold, Aud; Breen, Michael et al. (2017). From survival studies to management - Norwegian purse seine fisheries. (external link)
• Gjøsæter, Harald; Ona, Egil; Knutsen, Tor et al. (2017). New insight regarding vertical migration of a deep scattering layer in the Arctic. (external link)
• Ona, Egil; Pedersen, Ronald; Korneliussen, Rolf (2016). The TS-probe, a new instrument for detailed TS measurements of single targets and for profiling the water column. (external link)
• Holmin, Arne Johannes; Pena, Hector; Ona, Egil (2015). A new fish school segmentation method for fishery sonar. (external link)
• Pena, Hector; Ona, Egil (2014). Biomass estimates for selected herring schools using omni‐directional fisheries sonar and echo sounder. (external link)
• Pena, Hector; Holmin, Arne Johannes; Ona, Egil (2014). Biomass estimation by echo integration using omnidirectional fishery sonar. (external link)
• Vatnehol, Sindre; Totland, Atle; Macaulay, Gavin et al. (2013). Calibration trials on a omnidirectional fishery sonar with the split beam method. (external link)
• Breen, Mike; Isaksen, Bjørnar; Ona, Egil et al. (2012). A review of possible mitigation measures for reducing mortality in purse-seine fisheries. (external link)
• Macaulay, Gavin; Ona, Egil; Andersen, Lars nonboe et al. (2012). Calibration of a broadband split-beam echosounder and broadband spectra from selected targets. (external link)
• Ona, Egil; Macaulay, Gavin; Korneliussen, Rolf et al. (2012). The acoustic absorption coefficient at 333 kHz. (external link)
• Ona, Egil; Pedersen, Ronald (2012). Probing the ocean; a new promising combined observation method. (external link)
• Ona, Egil; Andersen, Lars Nonboe; Calise, Lucio et al. (2011). Exploiting broadband split-beam echosounders for zooplankton; some pre-liminary results from the WESTZOO project. (external link)
• Calise, Lucio; Ona, Egil; Knutsen, Tor et al. (2011). Ex situ target-strength measurements of Northern krill (Meganyctiphanes norvegica) with a broadband split-beam echosounder prototype. (external link)
• Kubilus, Rokas; Ona, Egil; Skaret, Georg (2011). Orientation of krill and fish in situ as determined by stereogrammetry. (external link)
• Macaulay, Gavin; Andersen, Lars Nonboe; Ona, Egil (2011). Estimation of target position using a split-beam broadband echosounder. (external link)
• Andersen, Lars nonboe; Ona, Egil (2011). Trials with broadband split beam echo sounders for zooplankton: some preliminary results from the WESTZOO project. (external link)
• Ona, Egil; Andersen, Lars nonboe; Patel, Ruben et al. (2011). Calibration of a multibeam echo sounder for abundance estimation of sandeel biomass. (external link)
• Ona, Egil; Andersen, Lars nonboe; Solli, Haakon et al. (2011). Exploratory measurements using a broadband, split beam echo sounder system. (external link)
• Nesse, Tonje Lexau; Hobæk, Halvor; Korneliussen, Rolf Jacob et al. (2006). Acoustic Scattering from Atlantic Mackerel Backbones. (external link)
• Knudsen, H.P; Melle, W; Misund, O.A et al. (2001). Complete acoustic recording of water column scatters and sea bed characteristics. (external link)

Errata

• Scoulding, Ben; Chu, Dezhang; Ona, Egil et al. (2022). Erratum: Target strengths of two abundant mesopelagic fish species (J. Acoust. Soc. Am. (2015) 137:2 (989-1000) DOI: 10.1121/1.4906177). (external link)
• Peña, Héctor; Macaulay, Gavin; Ona, Egil et al. (2021). Erratum: Estimating individual fish school biomass using digital omnidirectional sonars, applied to mackerel and herring (ICES Journal of Marine Science (2021) 78 (1174) DOI: 10.1093/icesjms/fsaa237). (external link)

Report

• Ona, Egil; Handegard, Nils Olav; Pedersen, Geir et al. (2021). CRIMAC - Annual Report 2020. (external link)
• Ona, Egil; Handegard, Nils Olav; Johnsen, Espen et al. (2021). CRIMAC cruise report 2020116. (external link)
• Tenningen, Maria; Pena, Hector; Korneliussen, Rolf et al. (2019). Feasibility study on the use of scientific multibeam sonar to characterize the Atlantic Bluefin Tuna spawning stock. (external link)
• Ona, Egil (2016). Kan måle fiskestørrelse før fangsting. (external link)
• Ingvaldsen, Randi Brunvær; Bucklin, Ann; Chierici, Melissa et al. (2016). Cruise report SI_ARCTIC/Arctic Ecosystem survey R/V Helmer Hanssen, 17 August - 7 September 2015. (external link)
• Eriksen, Elena; Gjøsæter, Harald; Johansen, Geir Odd et al. (2009). Er det mogleg å justere loddekvoten ut frå eit vinterloddetokt? Oppsummering av tokt 2007-2009. (external link)
• Ona, E (1999). ICES Cooperative Research Report No.235. (external link)
• Ona, Egil; Pennington, Michael Robert; Vølstad, Jon Helge (1992). Using acoustics to improve precision of bottom trawl indices of abundance. ICES C.M. 1991/D:13. (external link)
• Ona, Egil; Toresen, Reidar; Gjøsæter, Harald (1988). Rapport fra metodetokt med F/F Eldjarn januar 1988. (external link)
• Aure, Jan; Ona, Egil; Sundby, Svein (1985). Spredning av gruveavfall i kystområdet utenfor Jøssingfjord fra Titania A/S. (external link)

Feature article

• Handegard, Nils Olav; Algrøy, Tonny; Ona, Egil (2021). Betre ekkolodd vil gi betre forståing av våre marine økosystem. (external link)

Article in business/trade/industry journal

• Handegard, Nils Olav; Algrøy, Tonny; Eikvil, Line et al. (2021). Smart Fisheries in Norway: Partnership between Science, Technology, and the Fishing Sector. (external link)

Interview

• Ona, Egil (2020). Tuning in to the sounds of the sea. (external link)
• Sundby, Svein; Ona, Egil (2003). Smygjeger etter småkryp.Intervju med Svein Sundby og Egil Ona i Bergens Tidende i forbindelse med pressekonferanse og presentasjon av nye ”G.O. Sars”. (external link)

Masters thesis

• Pedersen, Haiwa; Lunde, Per; Korneliussen, Rolf et al. (2020). Måling av ekvivalent åpningsvinkel for et 38 kHz fiskeriekkolodd. Kalibrering av ekkolodd ved bruk av flere svingere. Master thesis. (external link)
• Thorvaldsen, Kjetil Gjeitsund; Ona, Egil (2018). Improved density measurements of mesopelagic fish and the presence of physonect siphonophores in sound scattering layers, measured with multifrequency acoustics and a stereo camera mounted on a lowered probe. (external link)
• Vatnehol, Sindre Nordlund; Lunde, Per; Ona, Egil (2012). Modellering av det spredte lydfeltet fra en rigid kule med innfallende lydfelt fra en akustisk sylinderarray (Eng.: Modelling of the sound pressure scattered from a rigid sphere, with incident sound field radiated by a cylindrical acoustic array) (Master thesis). (external link)
• Aarbakke, Ole Nicolai Staurland; Ona, Egil (2007). Bio-acoustic investigations of sound scattering layers overlaying hydrothermal vens in the Arctic Ocean. (external link)
• Ona, Egil; Zahor, Mohammed (2006). Acoustic identification of sandeel (Ammodytes marinus) using multi-frequency methods. (external link)
• Ona, Egil; Utne, Kjell Rong (2005). Acoustic shadowing in dense herring layers, measured from the ventral side by a bottom-mounted transducer. (external link)
• Alid, Hector Eduardo Peña; Ona, Egil (2004). In situt target strength measurements of Chilean jack mackerel (Trachurus symmetricus murphyi, Nichols) using a commercial vessel with split beam echo sounder. (external link)
• Uumati, Martha; Ona, Egil (2004). Methods for measuring acoustic extinction in sardine (Sardina pilchardus W.) schools. (external link)

Lecture

• Ona, Egil (2018). Hvordan kan vi bestemme mengde og fiskestørrelse i en stim?. (external link)
• Ona, Egil (2016). Akustisk måling av fisketetthet, og målinger med sonar. (external link)
• Ona, Egil (2016). Hvordan måler vi mengden av fisk i havet, og hvordan beregnes fiskekvotene. (external link)
• Algrøy, Tonny; Ona, Egil (2016). Development of instrumentation for pre-catch identification and sizing of fish. (external link)
• Ona, Egil (2016). Measuring important fish stocks with acoustic instruments; how can we do it and where can it go wrong?. (external link)
• Ona, Egil (2015). Størrelsesmåling av fisk med bredbåndsekkolodd. (external link)
• Ona, Egil (2015). CRISP - forkus på nytteverdien for pelagisk sektor. (external link)
• Vatnehol, Sindre; Pena, Hector; Totland, Atle et al. (2015). calibration of omni-directional fisheries sonar using split beam target positioning. (external link)
• Korneliussen, Rolf; Ona, Egil; Skaret, Georg (2015). Complementary density estimates of fish layers with echo sounder and scientific sonar. (external link)
• Pena, Hector; Ona, Egil; Macaulay, Gavin et al. (2015). School biomass estimates using digital omnidirectional fisheries sonar. (external link)
• Johnsen, Espen; Ona, Egil; Harbitz, Alf et al. (2015). Increasing the precision in acoustic estimates of patchy distributed fish. (external link)
• Pedersen, Geir; Pena, Hector; Fässler, Sacha M.M. et al. (2015). Modelling (mean) target strength of individual herring (Clupea harengus) at any aspect as a function of pressure. (external link)
• Ona, Egil; Macaulay, Gavin; Pedersen, Ronald (2015). Target strength of herring and mackerel in dorsal and lateral aspect for sonar biomass estimation. (external link)
• Chu, Dezhang; Macaulay, Gavin; Ona, Egil (2015). Comparative studies and field measurements of the acoustic absorption coefficient in seawater. (external link)
• Ona, Egil (2015). Hvordan kan vi bestemme mengde og fiskestørrelse i en stim?. (external link)
• Vatnehol, Sindre; Macaulay, Gavin; Ona, Egil et al. (2013). Calibration trails on a omni-directional fisheries sonar with the split beam method. (external link)
• Pena, Hector; Ona, Egil (2012). Improved methods for mapping distribution and abundance of pelagic fish schools with omni-directional fisheries sonar. (external link)

Academic chapter/article/Conference paper

• Salvanes, Anne Gro Vea; Glenner, Henrik; Aksnes, Dag Lorents et al. (2018). Sampling gears and equipment. (external link)
• Balabanian, Jean-Paul; Viola, Ivan; Patel, Ruben et al. (2007). Sonar Explorer: A New Tool for Visualization of Fish Schools from 3D Sonar Data. (external link)

Doctoral dissertation

• Ona, Egil; Vatnehol, Sindre (2016). Increasing the biomass estimation accuracy of a single fish school using a cylindrical multi-beam fishery sonar. (external link)
• Kubilius, Rokas; Ona, Egil (2015). Multi-frequency acoustic discrimination between gas bubble plumes and biological targets in the ocean. (external link)
• Ona, Egil; Godø, Olav Rune; Alid, Hector Eduardo Peña (2009). Improving acoustic abundance estimates of pelagic fish using commercial fishing vessel. (external link)
• Pedersen, Geir; Ona, Egil; Hobæk, Halvor (2007). Methodology for in situ target strength measurement of fish. (external link)

Abstract

• Macaulay, Gavin; Ona, Egil; Kubilius, Rokas et al. (2016). Broadband acoustics: A viable tool for quantification of cod egg density and distribution?. (external link)
• Knudsen, Hans Petter; Melle, Webjørn Raunsgård; Misund, Ole Arve et al. (2001). Complete acoustic recording of water column scatters and sea bed characteristics. (external link)

Editorial

• Demer, David A.; Kloser, Rudy; MacLennan, David N et al. (2009). An introduction to the proceedings and a synthesis of the 2008 ICES Symposium on the Ecosystem Approach with Fisheries Acoustics and Complementary Technologies (SEAFACTS). (external link)

See a complete overview of publications in Cristin.