Espen Johnsen
Publications
Academic articles
2024
Uncrewed surface vehicles (USVs) as platforms for fisheries and plankton acoustics
ICES Journal of Marine Science
2024
Broadband backscattering by Atlantic herring (Clupea harengus L.) differs when measured from a research vessel vs. a silent uncrewed surface vehicle
ICES Journal of Marine Science
2024
Oil droplet fouling on lesser sandeel (Ammodytes marinus) eggshells does not enhance the crude oil induced developmental toxicity
Journal of Hazardous Materials
468
2023
Early ontogeny of the lesser sandeel (Ammodytes marinus)
Developmental Dynamics
2023
WORKSHOP ON UNAVOIDABLE SURVEY EFFORT REDUCTION 2 (WKUSER2)
ICES Scientific Reports
5
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)
Marine Environmental Research
176
2022
Kayak Drone – a silent acoustic unmanned surface vehicle for marine research
Frontiers in Marine Science
9
2021
Highly mixed impacts of near-future climate change on stock productivity proxies in the North East Atlantic
Fish and Fisheries
23
p. 601-615
2021
Killer whale movements on the Norwegian shelf are associated with herring density
MEPS
2021
Predicting abundance indices in areas without coverage with a latent spatio-temporal Gaussian model
ICES Journal of Marine Science
2020
In situ calibration of observatory broadband echosounders
ICES Journal of Marine Science
77
p. 2954-2959
2020
Long term acoustic time series of the Lofoten–Vesterålen ocean observatory
Journal of the Acoustical Society of America
148
2020
Video Image Enhancement and Machine Learning Pipeline for Underwater Animal Detection and Classification at Cabled Observatories
Sensors
20
p. 1-25
2020
in situ calibration of observatory broadband echosounders
ICES Journal of Marine Science
2020
Diel vertical movements determine spatial interactions between cod, pelagic fish and krill on an Arctic shelf bank
Marine Ecology Progress Series
638
p. 13-23
2020
Acoustic classification in multifrequency echosounder data using deep convolutional neural networks
ICES Journal of Marine Science
77
p. 1391-1400
2020
Measurements of underwater noise radiated by commercial ships at a cabled ocean observatory
Marine Pollution Bulletin
153
2019
Underwater noise from wind at the high north LoVe ocean observatory
p. 359-366
2019
StoX: An open source software for marine survey analyses
Methods in Ecology and Evolution
10
p. 1523-1528
2019
Cabled ocean observatory data reveal food supply mechanisms to a cold-water coral reef
Progress in Oceanography
172
p. 51-64
2018
Multispecies acoustic dead-zone correction and bias ratio estimates between acoustic and bottom-trawl data
ICES Journal of Marine Science
75
p. 361-373
2017
Collective structures anchor massive schools of lesser sandeel to the seabed, increasing vulnerability to fishery
Marine Ecology Progress Series
573
p. 229-236
2016
Acoustic identification of marine species using a feature library
Methods in oceanography
17
p. 187-205
2015
An evaluation of the bottom trawl surveys in the Benguela Current Large Marine Ecosystem
Fisheries Oceanography
24
p. 74-87
2014
Marine ecosystem acoustics (MEA): Quantifying processes in the sea at the spatio-temporal scales on which they occur
ICES Journal of Marine Science
71
p. 2357-2369
2014
A new model for simulating growth in fish
PeerJ
2013
2013
Small-scale spatial structuring of burrowed sandeels and the catching properties of the dredge
ICES Journal of Marine Science
70
p. 379-386
2012
A robust method for generating separate catch time-series for each of the hake species caught in the Namibian trawl fishery
South African Journal of Marine Science
34
p. 43-53
2011
Foetal deformities in a smooth-hound shark, Mustelus mustelus, from an oil exploited area in Angola
Cybium
35
p. 231-236
2009
Size-dependent frequency response of sandeel schools
ICES Journal of Marine Science
66
p. 1100-1105
Other journal contributions
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)
Sensors
23
2020
Long term acoustic time series of the Lofoten–Vesterålen ocean observatory
Journal of the Acoustical Society of America
148
2019
The Lofoten-Vesterålen Ocean Observatory—A cabled infrastructure for operational acoustical oceanography
Journal of the Acoustical Society of America
146
Scientific lectures
2024
Identifying size and behavior of Mueller’s Pearlside (Maurolicus muelleri) by combining measured broadband frequency responses with backscattering models and in-trawl observations
2024
Behaviour and platform dependent broadband backscattering by physostome fish (Clupea harengus L.) revisited
2024
Testing acoustic data quality and performance on Sounder USV
2023
Action plan for implementing USV in acoustic trawl surveys. CRIMAC – Workshop on Fisheries acoustics and Uncrewed Surface Vehicles.
2023
Spatial structure and sensitivity of lesser sandeel to increasing pressure of human activities filling knowledge gaps and improved risk assessment : KnowSandeel 2.0
2023
Tobis en nøkkelart -hvor sårbar er de ulike livsfasene hos tobis for menneskelig aktivitet i Nordsjøen og Norskekysten?
2023
Towards a multi-platform armada strategy for ecosystem based marine surveys
2023
Behaviour dependent broadband backscattering by physostomous fish (Clupea harengus L.)
2022
Developing and deploying machine learning methods for acoustic data
2021
CRIMAC - Center for Research-based Innovation in Marine Acoustic Abundance Estimation and Backscatter Classification
2019
Underwater noise from wind at the high north LoVe ocean observatory
2019
Acoustic measurements of herring close to the sea surface
2018
Sea2Data - from acquisition to advice
2017
In situ study of the functional response of cod to capelin using broadband acoustics and trawl sampling
2016
Sea2Data - from data acquisition to advice
2015
Increasing the precision in acoustic estimates of patchy distributed fish
2013
"StoX" - an open source approach to survey calculations
2013
Variance and estimates of number of individuals from acoustic surveys
2012
Kvoteutsiktene for de viktigste fiskeslagene de neste 5 årene
Poster
2024
Embryos of lesser sandeel (Ammodytes marinus) are robust to crude oil exposure
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.
2023
Centre for research based innovation in marine acoustic abundance estimation and backscatter classification (CRIMAC)
2022
IMPACT OF CHRONIC OIL POLLUTION ON RECRUITMENT OF PREY SPECIES - KnowSandeel Project
2021
Early ontogeny of lesser sandeel (Ammodytes marinus)
2018
Towards seamless integration of data and processing software: data products generated from machine-to-machine interfaces
Reports and dissertations
2024
Liste over forvaltningsrelevante naturenheter - Oppfølgende informasjon til rapporten "Forvaltningsrelevante naturenheter i sjø"
Rapport fra havforskningen
2024
Fangstprøvelotteriet 2023 - erfaringer og resultat
Rapport fra havforskningen
2024
Fordeling og mengde av tobis i norsk sone av Nordsjøen i mai 2023 — Tobistokt i Nordsjøen 23. april – 13. mai 2023
Toktrapport
2024
Foreløpig råd for tobisfiske i norsk økonomisk sone i 2024 - Faglig grunnlag
Rapport fra havforskningen
2024
Survey report for CRIMAC SFI 2023
Toktrapport
2023
Fangstprøvelotteriet 2022 - erfaringer og resultat
Rapport fra havforskningen
2023
Spatiotemporal variation in the growth and size distributions of lesser sandeel (Ammodytes marinus) in the north-eastern North Sea
2023
Toktrapport fra økosystemtokt i Vestlandsfjordene — Hydrografi, vannkjemi, reker, krill, bunnfisk, tobis og perifylla
2023
Fangstprøvelotteriet 2021 - erfaringer og resultat
2023
Foreløpige råd for tobisfiskeriet i norsk økonomisk sone 2023
2023
Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem
2023
Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem - Appendices
2022
Fangstprøvelotteriet 2020 – erfaringer og resultat
2022
Råd for tobisfiskeriet i norsk sone for 2022 - Tobistokt i Nordsjøen 27. april-12. mai 2022
2022
CRIMAC - Annual Report 2021
2022
Spatiotemporal Variation in the Density Distribution of Sprat (Sprattus Sprattus) in Hardangerfjorden and Sognefjorden
2021
CRIMAC - Annual Report 2020
2021
Kunnskapsstatus for havsil i norsk sone av Nordsjøen
2021
Fish diversity data from the Barents Sea Ecosystem Survey 2004-2019
2021
Final report for the REDUS project - Reduced Uncertainty in Stock Assessment
2021
CRIMAC cruise report 2020116
2020
Measuring distribution and density of sprat in Årdalsfjorden with a kayak drone - 15-16 August 2020
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
2018
Estimation of acoustic indices with CVs for cod and haddock in the Barents Sea winter survey 1994 – 2017 applying the Sea2Data StoX software.
2018
Estimation of acoustic indices with CVs for Northeast Arctic saithe in the Norwegian coastal survey 2003-2017 applying the Sea2Data StoX software.
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
2016
Tobis ved Vestlandet og i Nordsjøen 1950-1990
2015
Makrellen er en velsignelse for verden og økosystemene
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
Net reports
Net reports
- Liste over forvaltningsrelevante naturenheter
- Fangstprøvelotteriet 2023
- Fordeling og mengde av tobis i norsk sone av Nordsjøen i mai 2023
- Foreløpig råd for tobisfiske i norsk økonomisk sone i 2024
- Survey report for CRIMAC SFI 2023
- Fangstprøvelotteriet 2022
- Toktrapport fra økosystemtokt i Vestlandsfjordene
- Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem
- Panel-based Assessment of Ecosystem Condition of the North Sea Shelf Ecosystem - Appendices
- Foreløpige råd for tobisfiskeriet i norsk økonomisk sone 2023
- Fangstprøvelotteriet 2021 - erfaringer og resultat
- Råd for tobisfiskeriet i norsk sone for 2022
- Fangstprøvelotteriet 2020 – erfaringer og resultat
- Kunnskapsstatus for havsil i norsk sone av Nordsjøen
- Fish diversity data from the Barents Sea Ecosystem Survey 2004-2019
- Final report for the REDUS project
- Measuring distribution and density of sprat in Årdalsfjorden with a kayak drone
- StoX applied to cod and haddock data from the Barents Sea NOR-RUS ecosystem cruise in autumn
News
News
- (26.09.2024) Sprat cruise in Hardanger was remotely controlled from Bergen
- (23.10.2023) Unmanned vehicles to meet growing need for research data
- (21.04.2022) Sandeel larvae undisturbed by subsea cables connecting wind farms
- (09.09.2020) This remotely piloted kayak can observe sprat close to the surface
- (25.08.2020) LoVe ocean observatory fully operational
- (25.08.2020) Deep insight into the oceans off Vesterålen
- (21.10.2019) Software revolutionises marine research
- (29.04.2019) Sends saildrone cruising in the North Sea
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