Publications
Academic article
- Elin Sørhus; Reidun Marie Bjelland; Caroline Durif et al. (2026). Minimal oil exposure causes sublethal damage in early larval stages of a key prey species, lesser sandeel (Ammodytes marinus). (external link)
- Emma Vogel; Martin Biuw; Marie-Anne Blanchet et al. (2021). Killer whale movements on the Norwegian shelf are associated with herring density. (external link)
- Prescilla Perrichon; Reidun Marie Bjelland; Caroline Durif et al. (2023). Early ontogeny of the lesser sandeel (Ammodytes marinus). (external link)
- Olav Brautaset; Anders Ueland Waldeland; Espen Johnsen et al. (2020). Acoustic classification in multifrequency echosounder data using deep convolutional neural networks. (external link)
- Vanesa Lopez-vazquez; Jose Manuel Lopez-guede; Simone Marini et al. (2020). Video Image Enhancement and Machine Learning Pipeline for Underwater Animal Detection and Classification at Cabled Observatories. (external link)
- Kotaro Ono; Stan Kotwicki; Gjert Endre Dingsør et al. (2018). Multispecies acoustic dead-zone correction and bias ratio estimates between acoustic and bottom-trawl data. (external link)
- Espen Johnsen; Alf Harbitz (2013). Small-scale spatial structuring of burrowed sandeels and the catching properties of the dredge. (external link)
- Nils Olav Handegard; Alex De Robertis; Arne Johannes Holmin et al. (2024). Uncrewed surface vehicles (USVs) as platforms for fisheries and plankton acoustics. (external link)
- Diana Zaera-Perez; Espen Johnsen (2011). Foetal deformities in a smooth-hound shark, Mustelus mustelus, from an oil exploited area in Angola. (external link)
- Atle Totland; Espen Johnsen (2022). Kayak Drone – a silent acoustic unmanned surface vehicle for marine research. (external link)
- Guosong Zhang; Tonje Nesse Forland; Espen Johnsen et al. (2020). Measurements of underwater noise radiated by commercial ships at a cabled ocean observatory. (external link)
- Geir Pedersen; Espen Johnsen; Babak Khodabandeloo et al. (2024). Broadband backscattering by Atlantic herring (Clupea harengus L.) differs when measured from a research vessel vs. a silent uncrewed surface vehicle. (external link)
- Georg Skaret; Hector Pena; Maria Tenningen et al. (2025). Evaluation of pre-spawning monitoring of Barents Sea capelin for assessment and advice. (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)
- Espen Johnsen; Atle Totland; Åsmund Skålevik et al. (2019). StoX: An open source software for marine survey analyses. (external link)
- Johannes Hamre; Espen Johnsen; Kristin Hamre (2014). A new model for simulating growth in fish. (external link)
- Tom Van Engeland; Olav Rune Godø; Espen Johnsen et al. (2019). Cabled ocean observatory data reveal food supply mechanisms to a cold-water coral reef. (external link)
- Olav Nikolai Breivik; Fredrik L Aanes; Guldborg Søvik et al. (2021). Predicting abundance indices in areas without coverage with a latent spatio-temporal Gaussian model. (external link)
- Nils Olav Handegard; Arne Johannes Holmin; Ahmet Pala et al. (2025). Integrating and assessing machine learning acoustic target classification models for fish survey estimations. (external link)
- Elin Sørhus; Reidun Marie Bjelland; Caroline Durif et al. (2024). Oil droplet fouling on lesser sandeel (Ammodytes marinus) eggshells does not enhance the crude oil induced developmental toxicity. (external link)
- Rolf Korneliussen; Yngve Heggelund; Gavin Macaulay et al. (2016). Acoustic identification of marine species using a feature library. (external link)
- Espen Johnsen; J. Kathena (2012). A robust method for generating separate catch time-series for each of the hake species caught in the Namibian trawl fishery. (external link)
- Aril Slotte; Are Salthaug; Sindre Vatnehol et al. (2025). Herring spawned poleward following fishery-induced collective memory loss. (external link)
- Espen Johnsen; Ronald Pedersen; Egil Ona (2009). Size-dependent frequency response of sandeel schools. (external link)
- Egil Ona; Guosong Zhang; Geir Pedersen et al. (2020). In situ calibration of observatory broadband echosounders. (external link)
- Bjørn Erik E Axelsen; Espen Johnsen (2015). An evaluation of the bottom trawl surveys in the Benguela Current Large Marine Ecosystem. (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)
- Georg Skaret; Geir Odd Johansen; Espen Johnsen et al. (2020). Diel vertical movements determine spatial interactions between cod, pelagic fish and krill on an Arctic shelf bank. (external link)
- Sean C. Anderson; Nate Bacheler; Lewis Barnett et al. (2023). WORKSHOP ON UNAVOIDABLE SURVEY EFFORT REDUCTION 2 (WKUSER2). (external link)
- Olav Sigurd Kjesbu; Svein Sundby; Anne Britt Sandø et al. (2021). Highly mixed impacts of near-future climate change on stock productivity proxies in the North East Atlantic. (external link)
- Sakura Komiyama; Arne Johannes Holmin; Geir Pedersen et al. (2025). Silent uncrewed surface vehicles reveal the diurnal vertical distribution of lesser sandeel. (external link)
- Alessandro Cresci; Prescilla Perrichon; Caroline Durif et al. (2022). Magnetic fields generated by the DC cables of offshore wind farms have no effect on spatial distribution or swimming behavior of lesser sandeel larvae (Ammodytes marinus). (external link)
- Lars Alf Ødegaard; Geir Pedersen; Espen Johnsen (2019). Underwater noise from wind at the high north LoVe ocean observatory. (external link)
Research report
- Åge Sigurd Høines; Justine Emmanuelle Diaz; Lise Heggebakken et al. (2025). Fangstprøvelotteriet 2024 - Erfaringer og resultater. (external link)
- Espen Johnsen (2023). Foreløpige råd for tobisfiskeriet i norsk økonomisk sone 2023. (external link)
- Leif Nøttestad; Espen Johnsen; Kjell Rong Utne (2015). Makrellen er en velsignelse for verden og økosystemene. (external link)
- Are Salthaug; Erling Kåre Stenevik; Espen Johnsen (2025). Distribution and abundance of Norwegian spring-spawning herring during the spawning season in 2025. (external link)
- Sigbjørn Mehl; Espen Johnsen; Åsmund Skålevik et al. (2018). Estimation of acoustic indices with CVs for Northeast Arctic saithe in the Norwegian coastal survey 2003-2017 applying the Sea2Data StoX software.. (external link)
- Erik Joel Steinar Olsen; Sondre Aanes; Magne Tommy Aldrin et al. (2021). Final report for the REDUS project - Reduced Uncertainty in Stock Assessment. (external link)
- Espen Johnsen; Cecilie Kvamme (2026). Foreløpig råd for tobisfiske i norsk økonomisk sone i 2026. (external link)
- Geir Huse; Siri Aaserud Olsen; Guldborg Søvik et al. (2026). Ressursoversikt 2026. (external link)
- Alessandro Orio; Lies Vansteenbrugge; Muhammad Abdullah et al. (2025). Working Group on the Assessment of Demersal Stocks in the North Sea and Skagerrak (WGNSSK). (external link)
- Åge Sigurd Høines; Espen Johnsen; Cecilie Kvamme et al. (2022). Fangstprøvelotteriet 2020 – erfaringer og resultat. (external link)
- Espen Johnsen; Hector Pena; Ronald Pedersen et al. (2024). Fordeling og mengde av tobis i norsk sone av Nordsjøen i mai 2023 — Tobistokt i Nordsjøen 23. april – 13. mai 2023. (external link)
- Espen Johnsen (2022). Råd for tobisfiskeriet i norsk sone for 2022 - Tobistokt i Nordsjøen 27. april-12. mai 2022. (external link)
- Nils Olav Handegard; Geir Pedersen; Tonje Nesse Forland et al. (2022). CRIMAC - Annual Report 2021. (external link)
- Edda Johannesen; Rupert Wienerroither; Herdis Langøy Mørk et al. (2021). Fish diversity data from the Barents Sea Ecosystem Survey 2004-2019. (external link)
- Espen Johnsen; Hector Pena (2026). Fordeling og mengde av tobis i norsk sone av Nordsjøen i april-mai 2024 — Tobistokt i Nordsjøen 25. april – 15. mai 2024. (external link)
- Espen Johnsen; Nils Olav Handegard; Brede Fedje Andersen et al. (2026). En konseptskisse – ekkolodddata fra fartøy til skyen for effektiv fiskeleting og forbedret fiskeriforskning. (external link)
- Cecilie Kvamme; Arne Johannes Holmin; Espen Johnsen et al. (2026). Brislingtokt i Hardangerfjorden, Sognefjorden, Nordfjorden og Trondheimsfjorden i 2025 på F/F Prinsesse Ingrid Alexandra - Toktnummer 2025005015. (external link)
- Åge Sigurd Høines; Justine Emmanuelle Diaz; Lise Heggebakken et al. (2023). Fangstprøvelotteriet 2021 - erfaringer og resultat. (external link)
- Sigbjørn Mehl; Asgeir Aglen; Espen Johnsen (2016). Re-estimation of swept area indices with CVs for main demersal fish species in the Barents Sea winter survey 1994-2016 applying the Sea2Data StoX software. (external link)
- Edda Johannesen; Espen Johnsen; Geir Odd Johansen et al. (2019). StoX applied to cod and haddock data from the Barents Sea NOR-RUS ecosystem cruise in autumn - Swept area abundance, length and weight at age 2004-2017. (external link)
- Espen Johnsen; Cecilie Kvamme (2025). Råd for tobisfiske i norsk økonomisk sone i 2025. (external link)
- Håkon Magne Otterå; Lise Heggebakken; Åge Sigurd Høines et al. (2024). Fangstprøvelotteriet 2023 - erfaringer og resultat. (external link)
- Jonatan Fredricson Marquez; Gro Ingleid van der Meeren; Terje van der Meeren et al. (2024). Liste over forvaltningsrelevante naturenheter - Oppfølgende informasjon til rapporten "Forvaltningsrelevante naturenheter i sjø". (external link)
- Are Salthaug; Erling Kåre Stenevik; Espen Johnsen (2026). Norsk vårgytende sild overvintringstokt 2025 med F/F Johan Hjort og USV Frida. (external link)
- Espen Johnsen; Cecilie Kvamme (2024). Foreløpig råd for tobisfiske i norsk økonomisk sone i 2024 - Faglig grunnlag. (external link)
- Per Arneberg; Berengere Husson; Anna Siwertsson et al. (2023). Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem - Appendices. (external link)
- Espen Johnsen; Cecilie Kvamme (2025). Foreløpig råd for tobisfiske i norsk økonomisk sone i 2025. (external link)
- Magnus Tangen; Johannes Hamre; Espen Johnsen et al. (2016). Tobis ved Vestlandet og i Nordsjøen 1950-1990. (external link)
- Sigbjørn Mehl; Asgeir Aglen; Espen Johnsen et al. (2018). Estimation of acoustic indices with CVs for cod and haddock in the Barents Sea winter survey 1994 – 2017 applying the Sea2Data StoX software.. (external link)
- Knut Sunnanå; Yuri A. Kovalev; Harald Gjøsæter et al. (2014). Assessments for management of living marine resources in the Barents Sea and adjacent waters – a focus on methodology The 16th Russian-Norwegian Symposium Sochi, Russia, 10-12 September 2013. (external link)
- Egil Ona; Nils Olav Handegard; Espen Johnsen et al. (2021). CRIMAC cruise report 2020116. (external link)
- Espen Johnsen; Hector Pena (2026). Fordeling og mengde av tobis i norsk sone av Nordsjøen i april-mai 2025. (external link)
- Are Salthaug; Espen Johnsen; Erling Kåre Stenevik (2025). Norsk vårgytende sild overvintringstokt 2024 med F/F Johan Hjort. (external link)
- Egil Ona; Nils Olav Handegard; Geir Pedersen et al. (2021). CRIMAC - Annual Report 2020. (external link)
- Per Arneberg; Berengere Husson; Anna Siwertsson et al. (2023). Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem. (external link)
- Espen Johnsen; Elin Sørhus; Karen de Jong et al. (2021). Kunnskapsstatus for havsil i norsk sone av Nordsjøen. (external link)
- Espen Johnsen; Cecilie Kvamme (2025). Measuring distribution and density of sprat in Norwegian fjords using a kayak drone. (external link)
- Guldborg Søvik; Tone Falkenhaug; Fabian Zimmermann et al. (2023). Toktrapport fra økosystemtokt i Vestlandsfjordene — Hydrografi, vannkjemi, reker, krill, bunnfisk, tobis og perifylla. (external link)
- Nils Olav Handegard; Vaneeda Allken; Arne Johannes Holmin et al. (2024). Survey report for CRIMAC SFI 2023. (external link)
- Espen Johnsen; Atle Totland; Cecilie Kvamme (2020). Measuring distribution and density of sprat in Årdalsfjorden with a kayak drone - 15-16 August 2020. (external link)
- Georg Skaret; Justine Emmanuelle Diaz; Lise Heggebakken et al. (2023). Fangstprøvelotteriet 2022 - erfaringer og resultat. (external link)
Conference lecture
- Espen Johnsen; Nils Olav Handegard; Atle Totland et al. (2023). Towards a multi-platform armada strategy for ecosystem based marine surveys. (external link)
- Espen Johnsen (2023). Action plan for implementing USV in acoustic trawl surveys. CRIMAC – Workshop on Fisheries acoustics and Uncrewed Surface Vehicles.. (external link)
- Ole Arve Misund; Bjarte Bogstad; tore Haug et al. (2012). Kvoteutsiktene for de viktigste fiskeslagene de neste 5 årene. (external link)
- Elin Sørhus; Frode Bendiksen Vikebø; Espen Johnsen (2023). Tobis en nøkkelart -hvor sårbar er de ulike livsfasene hos tobis for menneskelig aktivitet i Nordsjøen og Norskekysten?. (external link)
- Maria Tenningen; Geir Pedersen; Babak Khodabandeloo et al. (2024). Identifying size and behavior of Mueller’s Pearlside (Maurolicus muelleri) by combining measured broadband frequency responses with backscattering models and in-trawl observations. (external link)
- Nils Olav Handegard; Leif Edvard Bildøy; Stian Jacobsen et al. (2025). Implementing uncrewed surface vehicles in existing acoustic trawl surveys: data infrastructure, remote operating centre, edge computing, data compression and transfer, data quality monitoring, and automated target classification. (external link)
- Espen Johnsen; Atle Totland; Rokas Kubilius et al. (2019). Acoustic measurements of herring close to the sea surface. (external link)
- Geir Pedersen; Babak Khodabandeloo; Espen Johnsen et al. (2024). Behaviour and platform dependent broadband backscattering by physostome fish (Clupea harengus L.) revisited. (external link)
- Atle Totland; Harald Gjøsæter; Nils Olav Handegard et al. (2013). "StoX" - an open source approach to survey calculations. (external link)
- Geir Pedersen; Nils Olav Handegard; Espen Johnsen (2023). Behaviour dependent broadband backscattering by physostomous fish (Clupea harengus L.). (external link)
- Nils Olav Handegard; Arne Johannes Holmin; Espen Johnsen et al. (2024). Testing acoustic data quality and performance on Sounder USV. (external link)
- Georg Skaret; Johanna Jennifer Elisabeth Fall; Per Fauchald et al. (2017). In situ study of the functional response of cod to capelin using broadband acoustics and trawl sampling. (external link)
- Sjur Ringheim Lid; Åge Fotland; Harald Gjøsæter et al. (2018). Sea2Data - from acquisition to advice. (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)
- Nils Olav Handegard; Leif Edvard Bildøy; Espen Johnsen (2025). Uncrewed Surface Vehicles and fisheries acoustics: The Norwegian case. (external link)
- Knut Korsbrekke; Gjert Endre Dingsør; Espen Johnsen (2013). Variance and estimates of number of individuals from acoustic surveys. (external link)
- Elin Sørhus; Frode Bendiksen Vikebø; Espen Johnsen (2023). Spatial structure and sensitivity of lesser sandeel to increasing pressure of human activities filling knowledge gaps and improved risk assessment : KnowSandeel 2.0. (external link)
- Nils Olav Handegard; Olav Brautaset; Changkyu Choi et al. (2022). Developing and deploying machine learning methods for acoustic data. (external link)
- Lars Alf Ødegaard; Geir Pedersen; Espen Johnsen (2019). Underwater noise from wind at the high north LoVe ocean observatory. (external link)
Conference abstract
- Geir Pedersen; Espen Johnsen; Lars Alf Ødegaard et al. (2019). The Lofoten-Vesterålen Ocean Observatory—A cabled infrastructure for operational acoustical oceanography. (external link)
- Geir Pedersen; Guosong Zhang; Ana Sofia Aniceto et al. (2020). Long term acoustic time series of the Lofoten–Vesterålen ocean observatory. (external link)
Conference poster
- Geir Pedersen; Nils Olav Handegard; Babak Khodabandeloo et al. (2023). Classifying fish with broadband acoustics; behaviour and platform dependent broadband backscattering by physostomous fish (Clupea harengus L.). From Echosounders to the Cloud: Transforming Acoustic Data to Information.. (external link)
- Nils Olav Handegard; Harald Gjøsæter; Espen Johnsen et al. (2018). Towards seamless integration of data and processing software: data products generated from machine-to-machine interfaces. (external link)
- Prescilla Perrichon; Reidun Marie Bjelland; Caroline Durif et al. (2022). IMPACT OF CHRONIC OIL POLLUTION ON RECRUITMENT OF PREY SPECIES - KnowSandeel Project. (external link)
- Prescilla Perrichon; Reidun Marie Bjelland; Caroline Durif et al. (2021). Early ontogeny of lesser sandeel (Ammodytes marinus). (external link)
- Elin Sørhus; Reidun Marie Bjelland; Caroline Durif et al. (2024). Embryos of lesser sandeel (Ammodytes marinus) are robust to crude oil exposure. (external link)
- Nils Olav Handegard; Tonny Algrøy; Inge Kristian Eliassen et al. (2023). Centre for research based innovation in marine acoustic abundance estimation and backscatter classification (CRIMAC). (external link)
Master’s thesis
- Daniel Berge; Espen Johnsen; Maria Tenningen (2023). Spatiotemporal variation in the growth and size distributions of lesser sandeel (Ammodytes marinus) in the north-eastern North Sea. (external link)
- Daniel Jarl Skåtøy Stiti; Espen Johnsen; Cecilie Kvamme et al. (2022). Spatiotemporal variation in the density distribution of sprat (Sprattus sprattus) in Hardangerfjorden and Sognefjorden. (external link)
Lecture
Academic monograph
- Petur Steingrund; Tycho Anker-Nilssen; Høskuldur Bjørnsson et al. (2025). Advection of zooplankton onto the Nordic shelves and effects on forage fish, demersal fish and seabirds. (external link)
- Petur Steingrund; Tycho Anker-Nilssen; Høskuldur Bjørnsson et al. (2025). Ecosystem based management of sandeels, demersal fish and seabirds in Boreal ecosystems in Northeast Atlantic. (external link)