Browsing Published in cooperation with others by Author "Knutsen, Tor"
Now showing items 1-15 of 15
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Acoustic backscatter from zooplankton and fish explored through an optimized model framework
Lebourges-Dhaussy, A.; Knutsen, Tor; Korneliussen, Rolf J. (ICES CM Documents;2004/R:39, Working paper, 2004)The purpose of this work has been to test complementary methods in order to classify marine organisms, with particularly attention to zooplankton and fish. Algorithms to separate fish and zooplankton have been developed ... -
Acoustic visualization of large scale macroplankton and micronekton distributions across the Norwegian shelf and slope of the Norwegian Sea.
Melle, Webjørn; Kaartvedt, Stein; Knutsen, Tor; Dalpadado, Padmini; Skjoldal, Hein Rune (ICES CM Documents;1993/L:44, Working paper, 1993)We present results from acoustical (38 kHz split beam) surveys, biological sampling (trawling, zooplankton nets), and measurements of physical parameters (salinity, temperature, currents) across and along the shelf ... -
Climate variations and the state of zooplankton in the Barents Sea
Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)We present data on zooplankton biomass distribution in August-September 2005-2006 obtained in the integrated ecosystem system survey for the Barents Sea performed by Russian and Norwegian vessels. In order to establish ... -
Climate variations and the state of zooplankton in the Barents Sea
Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)We present data on zooplankton biomass distribution in August-September 2005-2006 obtained in the integrated ecosystem system survey for the Barents Sea performed by Russian and Norwegian vessels. In order to establish ... -
Climatic variations and the state of zooplankton in the barents sea [presentation]
Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007) -
Climatic variations and the state of zooplankton in the barents sea [presentation]
Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007) -
Detection and counting of individual free-swimming krill using a 2MHz scanning sonar
Ona, Egil; Knutsen, Tor (ICES CM Documents;1992/L:18, Working paper, 1992)The euphausiid crustacean Meganyctiphanes norvegica (M. Sars) have been detected and counted in the scanning section of a 2 MHz scanning sonar beam up to 3 meters from the sonar head. The tests completes a pilot investigation ... -
Experiences in making acoustic measurements in a mesocosm with Calanus finmarchius
Knutsen, Tor; Foote, Kenneth G. (ICES CM Documents;1997/FF:11, Working paper, 1997)In connection with a larger study of the effects of nutrification and turbulence on primary and secondary production, acoustic measurements have been made in the water volume defined by floating, vertically oriented, ... -
Initial collateral measurements of some properties of Calanus finmarchicus
Dalpadado, Padmini; Foote, Kenneth G.; Knutsen, Tor; Bækkevold, Anna Ersland; Johannessen, Signe E. (ICES CM Documents;1996/L:21, Working paper, 1996)In general, acoustic quantification of zooplankton such as Calanus finmarchicus requires the use of models, among other reasons, to aid in the interpretations of data collected on animals whose scattering properties change ... -
Joint PINRO/IMR report on the state of the Barents Sea ecosystem 2005/ 2006
Stiansen, Jan Erik; Aglen, Asgeir; Bogstad, Bjarte; Budgell, W. Paul; Dalpadado, Padmini; Dolgov, Andrey V.; Dommasnes, Are; Filin, Anatoly; Gjøsæter, Harald; Hauge, Kjellrun Hiis; Høines, Åge S.; Ingvaldsen, Randi; Johannesen, Edda; Jørgensen, Lis Lindal; Karsakov, A.L.; Klungsøyr, Jarle; Knutsen, Tor; Lien, Vidar S.; Loeng, Harald; Mehl, Sigbjørn; Buhl-Mortensen, Pål; Muchina, N.V.; Nesterova, V.N.; Olsen, Erik; Orlova, Emma L.; Ozhigin, Vladimir K.; Pedchenko, Andrey; Stenevik, Erling Kåre; Skogen, Morten D.; Titov, Oleg V.; Tjelmeland, Sigurd; Zabavnikov, V.B.; Ziryanov, S.V.; Zhukova, Nathalia; Øien, Nils; Aanes, Sondre (IMR/PINRO joint report series, Research report, 2006) -
Mapping of marine data
Westgård, Trond; Knutsen, Tor (ICES CM Documents;1988/C:39, Working paper, 1988)In the last 7-8 years the Institute of Marine Research has developed and exchanged computer routines with other research institutes, building up effcient tools for computer presentation of marine data. The routines are ... -
Multinational large scale krill synoptic survey in CCAMLR Area 48 in 2019-survey plan and protocol for consideration by SG-ASAM 2018
Krafft, Bjørn Arne; Bergstad, Odd Aksel; Knutsen, Tor; Skaret, Georg; Macaulay, Gavin (CCAMLR;SG-ASAM-18/07, Research report, 2018)The objective for the Multinational Large-Scale Krill Synoptic Survey in CCAMLR area 48 3 in 2019 is to provide an updated estimate of the biomass of Antarctic krill (Euphausia 4 superba) used in models to estimate sustainable ... -
Preliminary report from the sea-going workshop in Norway June 1993 on intercomparison and evaluation of methods for sampling and determination of zooplankton distribution and biomass
Skjoldal, Hein Rune; Wiebe, Peter H.; Knutsen, Tor; Postel, Lutz (ICES CM Documents;1993/L:45, Working paper, 1993)A sea-going workshop was arranged from 2 to 13 June 1993 in Storfjorden at Møre on the west coast of Norway. The workshop was a two-ship operation involving the Norwegian R/V "Johan Hjort" and the German R/V "A.V. Humboldt". ... -
Protocols for trawl sampling, recording of biological data, and hydrography for the 2019 international synoptic krill survey in Area 48
Knutsen, Tor; Krafft, Bjørn Arne; Renner, Angelika; Skaret, Georg; macaulay, gavin; Bergstad, Odd Aksel (CCAMLR;WG-EMM-18/23, Research report, 2018)Experience gained through participation in international programmes like BIOMASS and the CCAMLR 2000 Survey has demonstrated that standardization of equipment and methods is one of the most crucial steps for any successful ... -
Underwater optics and behavioral responses of krill to presence of fish predators affect fish-plankton interactions
Kaartvedt, Stein; Skjoldal, Hein Rune; Melle, Webjørn; Knutsen, Tor (ICES CM Documents;1993/L:43, Working paper, 1993)In clear oceanic waters off the Norwegian shelf and in outer shelf waters, mesopelagic fish (Maurolicus muelleri) were located at approximately 200 m by day. Across a front into water of lower light penetration, M. ...