Publications
Conference lecture
- Aud Vold; Michael Breen; Egil Ona et al. (2019). CRISP - eight years of innovation in fisheries technology. (external link)
- Mike Breen; Bjørnar Isaksen; Egil Ona et al. (2012). A review of possible mitigation measures for reducing mortality in purse-seine fisheries. (external link)
- Babak Khodabandeloo; Egil Ona; Gavin Macaulay et al. (2022). Acoustically induced nonlinear crosstalk in broadband echosounders. (external link)
- Hector Pena; Egil Ona (2014). Biomass estimates for selected herring schools using omni‐directional fisheries sonar and echo sounder. (external link)
- Hector Pena; Arne Johannes Holmin; Egil Ona (2014). Biomass estimation by echo integration using omnidirectional fishery sonar. (external link)
- Rokas Kubilius; Gavin Macaulay; Egil Ona et al. (2019). Broadband backscattering from tethered Atlantic mackerel. (external link)
- Espen Johnsen; Atle Totland; Rokas Kubilius et al. (2019). Acoustic measurements of herring close to the sea surface. (external link)
- Egil Ona; Ronald Pedersen; Rolf Korneliussen (2016). The TS-probe, a new instrument for detailed TS measurements of single targets and for profiling the water column. (external link)
- Egil Ona; Lars Nonboe Andersen; Lucio Calise et al. (2011). Exploiting broadband split-beam echosounders for zooplankton; some pre-liminary results from the WESTZOO project. (external link)
- Lucio Calise; Egil Ona; Tor Knutsen et al. (2011). Ex situ target-strength measurements of Northern krill (Meganyctiphanes norvegica) with a broadband split-beam echosounder prototype. (external link)
- Babak Khodabandeloo; Egil Ona; Gavin Macaulay et al. (2021). Nonlinear higher harmonics and crosstalk in broadband multi-channels echosounders. (external link)
- Egil Ona (2021). Echo sounder developments during my scientific life, - from EK38 to EK80, some significant steps. (external link)
- Rokas Kubilus; Egil Ona; Georg Skaret (2011). Orientation of krill and fish in situ as determined by stereogrammetry. (external link)
- Gavin Macaulay; Lars Nonboe Andersen; Egil Ona (2011). Estimation of target position using a split-beam broadband echosounder. (external link)
- Rokas Kubilius; Egil Ona; Gavin Macaulay et al. (2018). Broadband backscattering from artificial fish-like targets. (external link)
- Egil Ona; Rokas Kubilius (2018). Target strenght of spawning herring.. (external link)
- Lars N Andersen; Dezhang Chu; Nils Olav Handegard et al. (2022). Quantitative processing of broadband data as implemented in a scientific split-beam echosounder. (external link)
- Egil Ona (2018). From single-beam acoustics to wideband analysis; can we study biology with new tools?. (external link)
- Egil Ona (2018). Acoustic tools: New methods enable efficient mapping of mesopelagic fish aggregations. (external link)
- Gavin Macaulay; Egil Ona; Lars nonboe Andersen et al. (2012). Calibration of a broadband split-beam echosounder and broadband spectra from selected targets. (external link)
- Egil Ona; Gavin Macaulay; Rolf Korneliussen et al. (2012). The acoustic absorption coefficient at 333 kHz. (external link)
- Lars nonboe Andersen; Egil Ona (2011). Trials with broadband split beam echo sounders for zooplankton: some preliminary results from the WESTZOO project. (external link)
- Egil Ona; Lars nonboe Andersen; Ruben Patel et al. (2011). Calibration of a multibeam echo sounder for abundance estimation of sandeel biomass. (external link)
- Egil Ona; Lars nonboe Andersen; Haakon Solli et al. (2011). Exploratory measurements using a broadband, split beam echo sounder system. (external link)
- Maria Tenningen; Aud Vold; Michael Breen et al. (2017). From survival studies to management - Norwegian purse seine fisheries. (external link)
- Egil Ona; Ronald Pedersen (2012). Probing the ocean; a new promising combined observation method. (external link)
- H.P Knudsen; W Melle; O.A Misund et al. (2001). Complete acoustic recording of water column scatters and sea bed characteristics. (external link)
- Tonje Lexau Nesse; Halvor Hobæk; Rolf Jacob Korneliussen et al. (2006). Acoustic Scattering from Atlantic Mackerel Backbones. (external link)
- Arne Johannes Holmin; Hector Pena; Egil Ona (2015). A new fish school segmentation method for fishery sonar. (external link)
- Harald Gjøsæter; Egil Ona; Tor Knutsen et al. (2017). New insight regarding vertical migration of a deep scattering layer in the Arctic. (external link)
- Egil Ona; Guosong Zhang; Nils Olav Handegard et al. (2021). Direct measurements of the migration speed of spawning herring. (external link)
- Nils Olav Handegard; Tonje Nesse Forland; Espen Johnsen et al. (2021). CRIMAC - Center for Research-based Innovation in Marine Acoustic Abundance Estimation and Backscatter Classification. (external link)
- Babak Khodabandeloo; Egil Ona; Geir Pedersen et al. (2022). Gas-baldder elongation estimation of mesopelagic organisms from wideband target strength frequency response. (external link)
- Sindre Vatnehol; Atle Totland; Gavin Macaulay et al. (2013). Calibration trials on a omnidirectional fishery sonar with the split beam method. (external link)
Academic article
- Bjørn Arne Krafft; Ludvig A. Krag; Ronald Pedersen et al. (2023). Antarctic krill (Euphausia superba) catch weight estimated with a trawl-mounted echosounder during fishing. (external link)
- Inês Dias Bernardes; Egil Ona; Harald Gjøsæter (2020). Study of the Arctic mesopelagic layer with vessel and profiling multifrequency acoustics. (external link)
- Gavin Macaulay; Sindre Vatnehol; Ole Bernt Gammelsæter et al. (2016). Practical calibration of ship-mounted omni-directional fisheries sonars. (external link)
- Ben Scoulding; Dezhang Chu; Egil Ona et al. (2015). Target strengths of two abundant mesopelagic fish species. (external link)
- Sindre Vatnehol; Atle Totland; Egil Ona (2016). Two mechanical rigs for field calibration of multi-beam fishery sonars. (external link)
- Svein Løkkeborg; Egil Ona; Aud Vold et al. (2012). Effects of Sounds From Seismic Air Guns on Fish Behavior and Catch Rates. (external link)
- Babak Khodabandeloo; Egil Ona; Gavin Macaulay et al. (2021). Nonlinear crosstalk in broadband multi-channel echosounders. (external link)
- Frank Reier Knudsen; Jan Erik Fosseidengen; Frode Oppedal et al. (2004). Hydroacoustic monitoring of fish in sea cages: target strength (TS) measurements on Atlantic salmon (Salmo salar). (external link)
- Gavin Macaulay; Ben Schoulding; Egil Ona et al. (2018). Comparisons of echo-integration performance from two multiplexed echosounders. (external link)
- Ruben Patel; Egil Ona (2009). Measuring herring densities with one real and several phantom research vessels. (external link)
- Olav Rune Godø; Nils Olav Handegard; Howard Browman et al. (2014). Marine ecosystem acoustics (MEA): Quantifying processes in the sea at the spatio-temporal scales on which they occur. (external link)
- Geir Pedersen; Nils Olav Handegard; Egil Ona (2009). Lateral-aspect, target-strength measurements of in situ herring (Clupea harengus). (external link)
- Espen Johnsen; Guillaume Rieucau; Egil Ona et al. (2017). Collective structures anchor massive schools of lesser sandeel to the seabed, increasing vulnerability to fishery. (external link)
- Tonje Nesse Forland; Halvor Hobæk; Egil Ona et al. (2014). Broad bandwidth acoustic backscattering from sandeel - measurements and finite element simulations. (external link)
- Geir Pedersen; Olav Rune Godø; Egil Ona et al. (2011). A revised target strength-length estimate for blue whiting (Micromesistius poutassou): implications for biomass estimates. (external link)
- Svein Løkkeborg; Egil Ona; Aud Vold et al. (2012). Sounds from seismic air guns: gear- and species-specific effects on catch rates and fish distribution. (external link)
- Rokas Kubilius; Egil Ona; Lucio Calise (2015). Measuring in situ krill tilt orientation by stereo photogrammetry: Examples for Euphausia superba and Meganyctiphanes norvegica. (external link)
- Anders Løland; Magne Aldrin; Egil Ona et al. (2007). Estimating and decomposing total uncertainty for survey-based abundance estimates of Norwegian spring-spawning herring. (external link)
- Kenneth Foote; Egil Ona; Reidar Toresen (1992). Determining the extinction cross section of aggregating fish. (external link)
- Pauline Snoeijs-Leijonmalm; Harald Gjøsæter; Randi Brunvær Ingvaldsen et al. (2021). A deep scattering layer under the North Pole pack ice. (external link)
- Rokas Kubilius; Egil Ona (2012). Target strength and tilt-angle distribution of the lesser sandeel (Ammodytes marinus). (external link)
- Hector Pena; Gavin Macaulay; Egil Ona et al. (2021). Estimating individual fish school biomass using digital omnidirectional sonars, applied to mackerel and herring. (external link)
- Atle Totland; Geir Odd Johansen; Olav Rune Godø et al. (2009). Quantifying and reducing the surface blind zone and the seabed dead zone using new technology. (external link)
- Babak Khodabandeloo; Egil Ona; Geir Pedersen et al. (2022). Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements. (external link)
- Rokas Kubilius; Gavin Macaulay; Egil Ona (2020). Remote sizing of fish-like targets using broadband acoustics. (external link)
- Randi Brunvær Ingvaldsen; Harald Gjøsæter; Egil Ona et al. (2017). Atlantic cod (Gadus morhua)feeding over deep water in the high Arctic. (external link)
- Arill Engås; Svein Løkkeborg; Aud vold Soldal et al. (1996). Comparative fishing trials for cod and haddock using commercial trawl and longline at two different stock levels. (external link)
- Svein Løkkeborg; Egil Ona; Aud Vold et al. (2010). Effekter av seismiske undersøkelser på fiskefordeling og fangstrater for garn og line i Vesterålen sommeren 2009. (external link)
- Arill Engås; Svein Løkkeborg; Egil Ona et al. (1996). Effects of seismic shooting on local abundance and catch rates of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus). (external link)
- Egil Ona; Julius Nielsen (2022). Acoustic detection of the Greenland shark (Somniosus microcephalus) using multifrequency split beam echosounder in Svalbard waters. (external link)
- Peter H. Wiebe; Dezhang Chu; Stein Kaartvedt et al. (2010). The acoustic properties of Salpa thompsoni. (external link)
- Gavin Macaulay; Dezhang Chu; Egil Ona (2020). Field measurements of acoustic absorption in seawater from 38 to 360 kHz. (external link)
- Sindre Vatnehol; Hector Pena; Egil Ona (2017). Estimating the volumes of fish schools from observations with multi-beam sonars. (external link)
- Sindre Vatnehol; Egil Ona (2017). Evaluation of target angular position algorithms for multi-beam fishery sonars. (external link)
- Espen Johnsen; Ronald Pedersen; Egil Ona (2009). Size-dependent frequency response of sandeel schools. (external link)
- Gavin Macaulay; Hector Pena; Sacha M.M. Fässler et al. (2013). Accuracy of the Kirchhoff-approximation and Kirchhoff-ray-mode fish swimbladder acoustic scattering models. (external link)
- Fannie W. Shabangu; Egil Ona; Dawit Yemane (2014). Measurements of acoustic attenuation at 38kHz by wind-induced air bubbles with suggested correction factors for hull-mounted transducers. (external link)
- Ole Arve Misund; Asgeir Aglen; Johannes Hamre et al. (1996). Improved mapping of schooling fish near the surface: comparison of abundance estimates obtained by sonar and echo integration. (external link)
- Egil Ona; Valerie Mazauric; Lars Nonboe Andersen (2009). Calibration methods for two scientific multibeam systems. (external link)
- Lars Nonboe Andersen; Dezhang Chu; Nils Olav Handegard et al. (2023). Quantitative processing of broadband data as implemented in a scientific split-beam echosounder. (external link)
- Hector Pena; Nils Olav Handegard; Egil Ona (2013). Feeding herring schools do not react to seismic air gun surveys. (external link)
- Egil Ona; Guosong Zhang; Geir Pedersen et al. (2020). In situ calibration of observatory broadband echosounders. (external link)
- Alf Harbitz; Egil Ona; Michael Robert Pennington (2009). The use of an adaptive acoustic-survey design to estimate the abundance of highly skewed fish populations. (external link)
- Ruben Patel; Geir Pedersen; Egil Ona (2009). Inferring the acoustic dead-zone volume by split-beam echo sounder with narrow-beam transducer on a noninertial platform. (external link)
Lecture
- Egil Ona (2016). Akustisk måling av fisketetthet, og målinger med sonar. (external link)
- Egil Ona (2015). Størrelsesmåling av fisk med bredbåndsekkolodd. (external link)
- Egil Ona (2016). Hvordan måler vi mengden av fisk i havet, og hvordan beregnes fiskekvotene. (external link)
- Egil Ona (2015). CRISP - forkus på nytteverdien for pelagisk sektor. (external link)
- Egil Ona (2018). Hvordan kan vi bestemme mengde og fiskestørrelse i en stim?. (external link)
- Sindre Vatnehol; Hector Pena; Atle Totland et al. (2015). calibration of omni-directional fisheries sonar using split beam target positioning. (external link)
- Sindre Vatnehol; Gavin Macaulay; Egil Ona et al. (2013). Calibration trails on a omni-directional fisheries sonar with the split beam method. (external link)
- Rolf Korneliussen; Egil Ona; Georg Skaret (2015). Complementary density estimates of fish layers with echo sounder and scientific sonar. (external link)
- Hector Pena; Egil Ona (2012). Improved methods for mapping distribution and abundance of pelagic fish schools with omni-directional fisheries sonar. (external link)
- Tonny Algrøy; Egil Ona (2016). Development of instrumentation for pre-catch identification and sizing of fish. (external link)
- Hector Pena; Egil Ona; Gavin Macaulay et al. (2015). School biomass estimates using digital omnidirectional fisheries sonar. (external link)
- Espen Johnsen; Egil Ona; Alf Harbitz et al. (2015). Increasing the precision in acoustic estimates of patchy distributed fish. (external link)
- Geir Pedersen; Hector Pena; Sacha M.M. Fässler et al. (2015). Modelling (mean) target strength of individual herring (Clupea harengus) at any aspect as a function of pressure. (external link)
- Egil Ona; Gavin Macaulay; Ronald Pedersen (2015). Target strength of herring and mackerel in dorsal and lateral aspect for sonar biomass estimation. (external link)
- Dezhang Chu; Gavin Macaulay; Egil Ona (2015). Comparative studies and field measurements of the acoustic absorption coefficient in seawater. (external link)
- Egil Ona (2016). Measuring important fish stocks with acoustic instruments; how can we do it and where can it go wrong?. (external link)
- Egil Ona (2015). Hvordan kan vi bestemme mengde og fiskestørrelse i en stim?. (external link)
Media interview
Academic book chapter
Research report
- Egil Ona (2016). Kan måle fiskestørrelse før fangsting. (external link)
- Jan Aure; Egil Ona; Svein Sundby (1985). Spredning av gruveavfall i kystområdet utenfor Jøssingfjord fra Titania A/S. (external link)
- Egil Ona; Nils Olav Handegard; Geir Pedersen et al. (2021). CRIMAC - Annual Report 2020. (external link)
- Randi Brunvær Ingvaldsen; Ann Bucklin; Melissa Chierici et al. (2016). Cruise report SI_ARCTIC/Arctic Ecosystem survey R/V Helmer Hanssen, 17 August - 7 September 2015. (external link)
- E Ona (1999). ICES Cooperative Research Report No.235. (external link)
- Egil Ona; Michael Robert Pennington; Jon Helge Vølstad (1992). Using acoustics to improve precision of bottom trawl indices of abundance. ICES C.M. 1991/D:13. (external link)
- Elena Eriksen; Harald Gjøsæter; Geir Odd Johansen et al. (2009). Er det mogleg å justere loddekvoten ut frå eit vinterloddetokt? Oppsummering av tokt 2007-2009. (external link)
- Maria Tenningen; Hector Pena; Rolf Korneliussen et al. (2019). Feasibility study on the use of scientific multibeam sonar to characterize the Atlantic Bluefin Tuna spawning stock. (external link)
- Egil Ona; Reidar Toresen; Harald Gjøsæter (1988). Rapport fra metodetokt med F/F Eldjarn januar 1988. (external link)
- Egil Ona; Nils Olav Handegard; Espen Johnsen et al. (2021). CRIMAC cruise report 2020116. (external link)
Conference poster
- Jan Helge Fosså; Norvald Kjerstad; Astrid Kari Woll et al. (1996). Acoustic biomass estimats of seaweed (Laminaria Hyperborea). (external link)
- Rolf Birger Pedersen; Ingunn Hindenes Thorseth; H.P Knudsen et al. (2007). The 71N vent fields at the Arctic Mid-Ocean Ridge. (external link)
- Egil Ona; Guosong Zhang; Sindre Vatnehol et al. (2023). Direct measurements of the migration speed of spawning herring. (external link)
- Harald Gjøsæter; Peter H. Wiebe; Egil Ona et al. (2016). Does an acoustic deep scattering layer show diel vertical migration in the Arctic?. (external link)
- Bjørnar Isaksen; Jostein Saltskår; Aud Vold et al. (2012). Minimising ‘Slipping’ Mortality in Purse Seine Fisheries. (external link)
- Gavin Macaulay; Egil Ona; Rokas Kubilius (2015). Traceable calibration of calibration spheres. (external link)
Master’s thesis
- Hector Eduardo Peña Alid; Egil Ona (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)
- Martha Uumati; Egil Ona (2004). Methods for measuring acoustic extinction in sardine (Sardina pilchardus W.) schools. (external link)
- Sindre Nordlund Vatnehol; Per Lunde; Egil Ona (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)
- Haiwa Pedersen; Per Lunde; Rolf Korneliussen et al. (2020). Måling av ekvivalent åpningsvinkel for et 38 kHz fiskeriekkolodd. Kalibrering av ekkolodd ved bruk av flere svingere. Master thesis. (external link)
- Egil Ona; Mohammed Zahor (2006). Acoustic identification of sandeel (Ammodytes marinus) using multi-frequency methods. (external link)
- Egil Ona; Kjell Rong Utne (2005). Acoustic shadowing in dense herring layers, measured from the ventral side by a bottom-mounted transducer. (external link)
- Ole Nicolai Staurland Aarbakke; Egil Ona (2007). Bio-acoustic investigations of sound scattering layers overlaying hydrothermal vens in the Arctic Ocean. (external link)
- Kjetil Gjeitsund Thorvaldsen; Egil Ona (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)
Journal corrigendum
- Ben Scoulding; Dezhang Chu; Egil Ona 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)
- Héctor Peña; Gavin Macaulay; Egil Ona 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)
Doctoral thesis (PhD)
- Rokas Kubilius; Egil Ona (2015). Multi-frequency acoustic discrimination between gas bubble plumes and biological targets in the ocean. (external link)
- Geir Pedersen; Egil Ona; Halvor Hobæk (2007). Methodology for in situ target strength measurement of fish. (external link)
- Egil Ona; Sindre Vatnehol (2016). Increasing the biomass estimation accuracy of a single fish school using a cylindrical multi-beam fishery sonar. (external link)
- Egil Ona; Olav Rune Godø; Hector Eduardo Peña Alid (2009). Improving acoustic abundance estimates of pelagic fish using commercial fishing vessel. (external link)
Media feature article
Professional article
Conference abstract
- Hans Petter Knudsen; Webjørn Raunsgård Melle; Ole Arve Misund et al. (2001). Complete acoustic recording of water column scatters and sea bed characteristics. (external link)
- Gavin Macaulay; Egil Ona; Rokas Kubilius et al. (2016). Broadband acoustics: A viable tool for quantification of cod egg density and distribution?. (external link)