Rapport

• Johnsen, Espen; Pena, Hector (2026). Fordeling og mengde av tobis i norsk sone av Nordsjøen i april-mai 2025. (ekstern lenke)
• Johnsen, Espen; Pena, Hector (2026). Fordeling og mengde av tobis i norsk sone av Nordsjøen i april-mai 2024 — Tobistokt i Nordsjøen 25. april – 15. mai 2024. (ekstern lenke)
• Johnsen, Espen; Handegard, Nils Olav; Andersen, Brede Fedje et al. (2026). En konseptskisse – ekkolodddata fra fartøy til skyen for effektiv fiskeleting og forbedret fiskeriforskning. (ekstern lenke)
• Johnsen, Espen; Kvamme, Cecilie (2026). Foreløpig råd for tobisfiske i norsk økonomisk sone i 2026. (ekstern lenke)
• Salthaug, Are; Stenevik, Erling Kåre; Johnsen, Espen (2026). Norsk vårgytende sild overvintringstokt 2025 med F/F Johan Hjort og USV Frida. (ekstern lenke)
• Huse, Geir; Olsen, Siri Aaserud; Søvik, Guldborg et al. (2026). Ressursoversikt 2026. (ekstern lenke)
• Kvamme, Cecilie; Holmin, Arne Johannes; Johnsen, Espen et al. (2026). Brislingtokt i Hardangerfjorden, Sognefjorden, Nordfjorden og Trondheimsfjorden i 2025 på F/F Prinsesse Ingrid Alexandra - Toktnummer 2025005015. (ekstern lenke)
• Orio, Alessandro; Vansteenbrugge, Lies; Abdullah, Muhammad et al. (2025). Working Group on the Assessment of Demersal Stocks in the North Sea and Skagerrak (WGNSSK). (ekstern lenke)
• Høines, Åge Sigurd; Diaz, Justine Emmanuelle; Heggebakken, Lise et al. (2025). Fangstprøvelotteriet 2024 - Erfaringer og resultater. (ekstern lenke)
• Salthaug, Are; Johnsen, Espen; Stenevik, Erling Kåre (2025). Norsk vårgytende sild overvintringstokt 2024 med F/F Johan Hjort. (ekstern lenke)
• Johnsen, Espen; Kvamme, Cecilie (2025). Foreløpig råd for tobisfiske i norsk økonomisk sone i 2025. (ekstern lenke)
• Johnsen, Espen; Kvamme, Cecilie (2025). Measuring distribution and density of sprat in Norwegian fjords using a kayak drone. (ekstern lenke)
• Johnsen, Espen; Kvamme, Cecilie (2025). Råd for tobisfiske i norsk økonomisk sone i 2025. (ekstern lenke)
• Salthaug, Are; Stenevik, Erling Kåre; Johnsen, Espen (2025). Distribution and abundance of Norwegian spring-spawning herring during the spawning season in 2025. (ekstern lenke)
• Johnsen, Espen; Kvamme, Cecilie (2024). Foreløpig råd for tobisfiske i norsk økonomisk sone i 2024 - Faglig grunnlag. (ekstern lenke)
• Johnsen, Espen; Pena, Hector; Pedersen, Ronald et al. (2024). Fordeling og mengde av tobis i norsk sone av Nordsjøen i mai 2023 — Tobistokt i Nordsjøen 23. april – 13. mai 2023. (ekstern lenke)
• Handegard, Nils Olav; Allken, Vaneeda; Holmin, Arne Johannes et al. (2024). Survey report for CRIMAC SFI 2023. (ekstern lenke)
• Otterå, Håkon Magne; Heggebakken, Lise; Høines, Åge Sigurd et al. (2024). Fangstprøvelotteriet 2023 - erfaringer og resultat. (ekstern lenke)
• Marquez, Jonatan Fredricson; Meeren, Gro Ingleid van der; Meeren, Terje van der et al. (2024). Liste over forvaltningsrelevante naturenheter - Oppfølgende informasjon til rapporten "Forvaltningsrelevante naturenheter i sjø". (ekstern lenke)
• Høines, Åge Sigurd; Diaz, Justine Emmanuelle; Heggebakken, Lise et al. (2023). Fangstprøvelotteriet 2021 - erfaringer og resultat. (ekstern lenke)
• Johnsen, Espen (2023). Foreløpige råd for tobisfiskeriet i norsk økonomisk sone 2023. (ekstern lenke)
• Arneberg, Per; Husson, Berengere; Siwertsson, Anna et al. (2023). Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem - Appendices. (ekstern lenke)
• Arneberg, Per; Husson, Berengere; Siwertsson, Anna et al. (2023). Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem. (ekstern lenke)
• Søvik, Guldborg; Falkenhaug, Tone; Zimmermann, Fabian et al. (2023). Toktrapport fra økosystemtokt i Vestlandsfjordene — Hydrografi, vannkjemi, reker, krill, bunnfisk, tobis og perifylla. (ekstern lenke)
• Skaret, Georg; Diaz, Justine Emmanuelle; Heggebakken, Lise et al. (2023). Fangstprøvelotteriet 2022 - erfaringer og resultat. (ekstern lenke)
• Høines, Åge Sigurd; Johnsen, Espen; Kvamme, Cecilie et al. (2022). Fangstprøvelotteriet 2020 – erfaringer og resultat. (ekstern lenke)
• Johnsen, Espen (2022). Råd for tobisfiskeriet i norsk sone for 2022 - Tobistokt i Nordsjøen 27. april-12. mai 2022. (ekstern lenke)
• Handegard, Nils Olav; Pedersen, Geir; Forland, Tonje Nesse et al. (2022). CRIMAC - Annual Report 2021. (ekstern lenke)
• Ona, Egil; Handegard, Nils Olav; Pedersen, Geir et al. (2021). CRIMAC - Annual Report 2020. (ekstern lenke)
• Johnsen, Espen; Sørhus, Elin; Jong, Karen de et al. (2021). Kunnskapsstatus for havsil i norsk sone av Nordsjøen. (ekstern lenke)
• Ona, Egil; Handegard, Nils Olav; Johnsen, Espen et al. (2021). CRIMAC cruise report 2020116. (ekstern lenke)
• Johannesen, Edda; Wienerroither, Rupert; Mørk, Herdis Langøy et al. (2021). Fish diversity data from the Barents Sea Ecosystem Survey 2004-2019. (ekstern lenke)
• Olsen, Erik Joel Steinar; Aanes, Sondre; Aldrin, Magne Tommy et al. (2021). Final report for the REDUS project - Reduced Uncertainty in Stock Assessment. (ekstern lenke)
• Johnsen, Espen; Totland, Atle; Kvamme, Cecilie (2020). Measuring distribution and density of sprat in Årdalsfjorden with a kayak drone - 15-16 August 2020. (ekstern lenke)
• Johannesen, Edda; Johnsen, Espen; Johansen, Geir Odd 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. (ekstern lenke)
• Mehl, Sigbjørn; Aglen, Asgeir; Johnsen, Espen 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.. (ekstern lenke)
• Mehl, Sigbjørn; Johnsen, Espen; Skålevik, Åsmund 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.. (ekstern lenke)
• Mehl, Sigbjørn; Aglen, Asgeir; Johnsen, Espen (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. (ekstern lenke)
• Tangen, Magnus; Hamre, Johannes; Johnsen, Espen et al. (2016). Tobis ved Vestlandet og i Nordsjøen 1950-1990. (ekstern lenke)
• Nøttestad, Leif; Johnsen, Espen; Utne, Kjell Rong (2015). Makrellen er en velsignelse for verden og økosystemene. (ekstern lenke)
• Sunnanå, Knut; Kovalev, Yuri A.; Gjøsæter, Harald 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. (ekstern lenke)

Vitenskapelig artikkel

• Sørhus, Elin; Bjelland, Reidun Marie; Durif, Caroline et al. (2026). Minimal oil exposure causes sublethal damage in early larval stages of a key prey species, lesser sandeel (Ammodytes marinus). (ekstern lenke)
• Skaret, Georg; Pena, Hector; Tenningen, Maria et al. (2025). Evaluation of pre-spawning monitoring of Barents Sea capelin for assessment and advice. (ekstern lenke)
• Handegard, Nils Olav; Holmin, Arne Johannes; Pala, Ahmet et al. (2025). Integrating and assessing machine learning acoustic target classification models for fish survey estimations. (ekstern lenke)
• Slotte, Aril; Salthaug, Are; Vatnehol, Sindre et al. (2025). Herring spawned poleward following fishery-induced collective memory loss. (ekstern lenke)
• Komiyama, Sakura; Holmin, Arne Johannes; Pedersen, Geir et al. (2025). Silent uncrewed surface vehicles reveal the diurnal vertical distribution of lesser sandeel. (ekstern lenke)
• Sørhus, Elin; Bjelland, Reidun Marie; Durif, Caroline et al. (2024). Oil droplet fouling on lesser sandeel (Ammodytes marinus) eggshells does not enhance the crude oil induced developmental toxicity. (ekstern lenke)
• Handegard, Nils Olav; Robertis, Alex De; Holmin, Arne Johannes et al. (2024). Uncrewed surface vehicles (USVs) as platforms for fisheries and plankton acoustics. (ekstern lenke)
• Pedersen, Geir; Johnsen, Espen; Khodabandeloo, Babak et al. (2024). Broadband backscattering by Atlantic herring (Clupea harengus L.) differs when measured from a research vessel vs. a silent uncrewed surface vehicle. (ekstern lenke)
• Perrichon, Prescilla; Bjelland, Reidun Marie; Durif, Caroline et al. (2023). Early ontogeny of the lesser sandeel (Ammodytes marinus). (ekstern lenke)
• Anderson, Sean C.; Bacheler, Nate; Barnett, Lewis et al. (2023). WORKSHOP ON UNAVOIDABLE SURVEY EFFORT REDUCTION 2 (WKUSER2). (ekstern lenke)
• Totland, Atle; Johnsen, Espen (2022). Kayak Drone – a silent acoustic unmanned surface vehicle for marine research. (ekstern lenke)
• Cresci, Alessandro; Perrichon, Prescilla; Durif, Caroline 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). (ekstern lenke)
• Vogel, Emma; Biuw, Martin; Blanchet, Marie-Anne et al. (2021). Killer whale movements on the Norwegian shelf are associated with herring density. (ekstern lenke)
• Kjesbu, Olav Sigurd; Sundby, Svein; Sandø, Anne Britt et al. (2021). Highly mixed impacts of near-future climate change on stock productivity proxies in the North East Atlantic. (ekstern lenke)
• Breivik, Olav Nikolai; Aanes, Fredrik L; Søvik, Guldborg et al. (2021). Predicting abundance indices in areas without coverage with a latent spatio-temporal Gaussian model. (ekstern lenke)
• Brautaset, Olav; Waldeland, Anders Ueland; Johnsen, Espen et al. (2020). Acoustic classification in multifrequency echosounder data using deep convolutional neural networks. (ekstern lenke)
• Lopez-vazquez, Vanesa; Lopez-guede, Jose Manuel; Marini, Simone et al. (2020). Video Image Enhancement and Machine Learning Pipeline for Underwater Animal Detection and Classification at Cabled Observatories. (ekstern lenke)
• Skaret, Georg; Johansen, Geir Odd; Johnsen, Espen et al. (2020). Diel vertical movements determine spatial interactions between cod, pelagic fish and krill on an Arctic shelf bank. (ekstern lenke)
• Zhang, Guosong; Forland, Tonje Nesse; Johnsen, Espen et al. (2020). Measurements of underwater noise radiated by commercial ships at a cabled ocean observatory. (ekstern lenke)
• Ona, Egil; Zhang, Guosong; Pedersen, Geir et al. (2020). In situ calibration of observatory broadband echosounders. (ekstern lenke)
• Johnsen, Espen; Totland, Atle; Skålevik, Åsmund et al. (2019). StoX: An open source software for marine survey analyses. (ekstern lenke)
• Engeland, Tom Van; Godø, Olav Rune; Johnsen, Espen et al. (2019). Cabled ocean observatory data reveal food supply mechanisms to a cold-water coral reef. (ekstern lenke)
• Ødegaard, Lars Alf; Pedersen, Geir; Johnsen, Espen (2019). Underwater noise from wind at the high north LoVe ocean observatory. (ekstern lenke)
• Ono, Kotaro; Kotwicki, Stan; Dingsør, Gjert Endre et al. (2018). Multispecies acoustic dead-zone correction and bias ratio estimates between acoustic and bottom-trawl data. (ekstern lenke)
• Johnsen, Espen; Rieucau, Guillaume; Ona, Egil et al. (2017). Collective structures anchor massive schools of lesser sandeel to the seabed, increasing vulnerability to fishery. (ekstern lenke)
• Korneliussen, Rolf; Heggelund, Yngve; Macaulay, Gavin et al. (2016). Acoustic identification of marine species using a feature library. (ekstern lenke)
• Axelsen, Bjørn Erik E; Johnsen, Espen (2015). An evaluation of the bottom trawl surveys in the Benguela Current Large Marine Ecosystem. (ekstern lenke)
• 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. (ekstern lenke)
• Hamre, Johannes; Johnsen, Espen; Hamre, Kristin (2014). A new model for simulating growth in fish. (ekstern lenke)
• Johnsen, Espen; Harbitz, Alf (2013). Small-scale spatial structuring of burrowed sandeels and the catching properties of the dredge. (ekstern lenke)
• Johnsen, Espen; Kathena, J. (2012). A robust method for generating separate catch time-series for each of the hake species caught in the Namibian trawl fishery. (ekstern lenke)
• Zaera-Perez, Diana; Johnsen, Espen (2011). Foetal deformities in a smooth-hound shark, Mustelus mustelus, from an oil exploited area in Angola. (ekstern lenke)
• Johnsen, Espen; Pedersen, Ronald; Ona, Egil (2009). Size-dependent frequency response of sandeel schools. (ekstern lenke)

Vitenskapelig monografi

• Steingrund, Petur; Anker-Nilssen, Tycho; Bjørnsson, Høskuldur et al. (2025). Advection of zooplankton onto the Nordic shelves and effects on forage fish, demersal fish and seabirds. (ekstern lenke)
• Steingrund, Petur; Anker-Nilssen, Tycho; Bjørnsson, Høskuldur et al. (2025). Ecosystem based management of sandeels, demersal fish and seabirds in Boreal ecosystems in Northeast Atlantic. (ekstern lenke)

Vitenskapelig foredrag

• Handegard, Nils Olav; Bildøy, Leif Edvard; Johnsen, Espen (2025). Uncrewed Surface Vehicles and fisheries acoustics: The Norwegian case. (ekstern lenke)
• Handegard, Nils Olav; Bildøy, Leif Edvard; Jacobsen, Stian 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. (ekstern lenke)
• Pedersen, Geir; Khodabandeloo, Babak; Johnsen, Espen et al. (2024). Behaviour and platform dependent broadband backscattering by physostome fish (Clupea harengus L.) revisited. (ekstern lenke)
• Handegard, Nils Olav; Holmin, Arne Johannes; Johnsen, Espen et al. (2024). Testing acoustic data quality and performance on Sounder USV. (ekstern lenke)
• Tenningen, Maria; Pedersen, Geir; Khodabandeloo, Babak 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. (ekstern lenke)
• Johnsen, Espen; Handegard, Nils Olav; Totland, Atle et al. (2023). Towards a multi-platform armada strategy for ecosystem based marine surveys. (ekstern lenke)
• Sørhus, Elin; Vikebø, Frode Bendiksen; Johnsen, Espen (2023). Tobis en nøkkelart -hvor sårbar er de ulike livsfasene hos tobis for menneskelig aktivitet i Nordsjøen og Norskekysten?. (ekstern lenke)
• Sørhus, Elin; Vikebø, Frode Bendiksen; Johnsen, Espen (2023). Spatial structure and sensitivity of lesser sandeel to increasing pressure of human activities filling knowledge gaps and improved risk assessment : KnowSandeel 2.0. (ekstern lenke)
• Pedersen, Geir; Handegard, Nils Olav; Johnsen, Espen (2023). Behaviour dependent broadband backscattering by physostomous fish (Clupea harengus L.). (ekstern lenke)
• Johnsen, Espen (2023). Action plan for implementing USV in acoustic trawl surveys. CRIMAC – Workshop on Fisheries acoustics and Uncrewed Surface Vehicles.. (ekstern lenke)
• Handegard, Nils Olav; Brautaset, Olav; Choi, Changkyu et al. (2022). Developing and deploying machine learning methods for acoustic data. (ekstern lenke)
• 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. (ekstern lenke)
• Johnsen, Espen; Totland, Atle; Kubilius, Rokas et al. (2019). Acoustic measurements of herring close to the sea surface. (ekstern lenke)
• Ødegaard, Lars Alf; Pedersen, Geir; Johnsen, Espen (2019). Underwater noise from wind at the high north LoVe ocean observatory. (ekstern lenke)
• Lid, Sjur Ringheim; Fotland, Åge; Gjøsæter, Harald et al. (2018). Sea2Data - from acquisition to advice. (ekstern lenke)
• Skaret, Georg; Fall, Johanna Jennifer Elisabeth; Fauchald, Per et al. (2017). In situ study of the functional response of cod to capelin using broadband acoustics and trawl sampling. (ekstern lenke)
• Korsbrekke, Knut; Dingsør, Gjert Endre; Johnsen, Espen (2013). Variance and estimates of number of individuals from acoustic surveys. (ekstern lenke)
• Totland, Atle; Gjøsæter, Harald; Handegard, Nils Olav et al. (2013). "StoX" - an open source approach to survey calculations. (ekstern lenke)
• Misund, Ole Arve; Bogstad, Bjarte; Haug, tore et al. (2012). Kvoteutsiktene for de viktigste fiskeslagene de neste 5 årene. (ekstern lenke)

Poster

• Sørhus, Elin; Bjelland, Reidun Marie; Durif, Caroline et al. (2024). Embryos of lesser sandeel (Ammodytes marinus) are robust to crude oil exposure. (ekstern lenke)
• Handegard, Nils Olav; Algrøy, Tonny; Eliassen, Inge Kristian et al. (2023). Centre for research based innovation in marine acoustic abundance estimation and backscatter classification (CRIMAC). (ekstern lenke)
• Pedersen, Geir; Handegard, Nils Olav; Khodabandeloo, Babak 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.. (ekstern lenke)
• Perrichon, Prescilla; Bjelland, Reidun Marie; Durif, Caroline et al. (2022). IMPACT OF CHRONIC OIL POLLUTION ON RECRUITMENT OF PREY SPECIES - KnowSandeel Project. (ekstern lenke)
• Perrichon, Prescilla; Bjelland, Reidun Marie; Durif, Caroline et al. (2021). Early ontogeny of lesser sandeel (Ammodytes marinus). (ekstern lenke)
• Handegard, Nils Olav; Gjøsæter, Harald; Johnsen, Espen et al. (2018). Towards seamless integration of data and processing software: data products generated from machine-to-machine interfaces. (ekstern lenke)

Intervju

• Johnsen, Espen; Handegard, Nils Olav; Fagerbakke, Christine (2023). Nytt selvgående forskningsfartøy testes i Hardangerfjorden. (ekstern lenke)

Mastergradsoppgave

• Berge, Daniel; Johnsen, Espen; Tenningen, Maria (2023). Spatiotemporal variation in the growth and size distributions of lesser sandeel (Ammodytes marinus) in the north-eastern North Sea. (ekstern lenke)
• Stiti, Daniel Jarl Skåtøy; Johnsen, Espen; Kvamme, Cecilie et al. (2022). Spatiotemporal variation in the density distribution of sprat (Sprattus sprattus) in Hardangerfjorden and Sognefjorden. (ekstern lenke)

Errata

• Lopez-Vazquez, Vanesa; Lopez-Guede, Jose Manuel; Marini, Simone et al. (2022). Erratum: Correction: Lopez-Vazquez et al. Video Image Enhancement and Machine Learning Pipeline for Underwater Animal Detection and Classification at Cabled Observatories. Sensors 2020, 20, 726 (Sensors (Basel, Switzerland) (2020) 20 3 PII: 16). (ekstern lenke)

Faglig foredrag

• Lid, Sjur Ringheim; Fotland, Åge; Gjøsæter, Harald et al. (2016). Sea2Data - from data acquisition to advice. (ekstern lenke)
• Johnsen, Espen; Ona, Egil; Harbitz, Alf et al. (2015). Increasing the precision in acoustic estimates of patchy distributed fish. (ekstern lenke)

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