Blar i Havforskningsinstituttet på emneord "biomasse"
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Abundance estimation of Northeast Atlantic mackerel based on tag recapture data - A useful tool for stock assessment?
(Journal article; Peer reviewed, 2010-10)In the present study we utilize tag recapture data to estimate year class abundance and spawning stock biomass of mackerel (Scomber scombrus L.) in the Northeast Atlantic for the period 1986–2008. On average 20,000 jigged ... -
Acoustic visualization of large scale macroplankton and micronekton distributions across the Norwegian shelf and slope of the Norwegian Sea.
(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 ... -
Akustisk mengdemåling av oppdrettslaks
(Fisken og havet, Research report, 1995)Continuous monitoring of the biomass in salmon cages is likely to increase the production efficiency. It would optimize density-dependent farm procedures, e.g food and drug administration, and provide a possibility for ... -
Biomass of Scyphozoan Jellyfish, and Its Spatial Association with 0-Group Fish in the Barents Sea
(Journal article; Peer reviewed, 2012-03-22)An 0-group fish survey is conducted annually in the Barents Sea in order to estimate fish population abundance. Data on jellyfish by-catch have been recorded since 1980, although this dataset has never been analysed. In ... -
Biomassekartlegging av Laminaria digitata i Smøla-området
(Fisken og havet, Research report, 2004)The biomass density of Laminaria digitata was examined on a total of 28 stations in the Smøla area (the county of Møre og Romsdalen). The highest abundance of L. digitata was found in the outermost and most wave-exposed ... -
Catch statistics and life history of shrimp, Pandalus borealis, in the Jan Mayen area
(ICES CM Documents;1996/K:11, Working paper, 1996)The Norwegian shrimp (Pandalus borealis) fisheries in the Jan Mayen area in the North East Atlantic started in 1974. The catches reached 2000 tons in 1985. Since 1986 the catches decreased, but lately they have increased ... -
Condition and size composition effects on the simulated relationship between spawner biomass and total egg production for Northeast Arctic cod (Gadus morhua L.)
(ICES CM Documents;1999/Y:6, Working paper, 1999)Spawner biomass (SB) is often assumed to be proportional to total egg production (TEP) by fish stocks. Recent studies suggest that this assumption may not be valid, particularly when the physiological condition of fish ... -
Density in sub-arctic zooplankton
(ICES CM documents, Working paper, 1985)Seasonal variations in specific density were measured for Thysanoessa inermis, Thysanoessa raschii, Meganyctiphanes norvegica, Calanus finmarchicus and Calanus hyperboreus. The density of a 20 mm T. inermis was lowest in ... -
Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years
(ICES CM documents, Working paper, 2003)Based on acoustic data and trawl catches collected during bottom trawl surveys, we compare the spatial structure of the biomass available in the first meters above the bottom in three different regions, the Barents Sea ... -
Dyreplankton i Barentshavet biomasse-variasjoner 1979 - 1994
(Fisken og havet, Research report, 1995)The capelin fisheries has until recently been a very important commercial fishery in the Barents Sea. The capelin stock has showed large fluctuations, with a size of about 4-7 mill. tons in 1973-1980 before the collapse ... -
Fish communities on the slop of the eastern Norwegian Sea
(ICES CM Documents;1998/O:30, Working paper, 1998)Bortom trawl data from the depth interval 300-2050 m on the slope off Norway were analysed to study distribution of fish biomass and the associated species assemblages. It is hypothesised that the pronounced hydrographic ... -
Growth of capelin in relation to zooplankton biomass in the Barents Sea
(ICES CM Documents;1995/P:5, Working paper, 1995)Growth of capelin in the Barents Sea stock has been found to vary considerably both between years and between different parts of the distribution area. The aim of this paper is to compare such growth variations with ... -
Norwegian investigations on the deep sea shrimp (Pandalus borealis) in the Barents Sea in April - May 1984 and in the Spitsbergen area in July -August 1984
(ICES CM Documents;1984/K:21, Working paper, 1984)This report discribes the results from a stratified bottom trawl survey with R/V "Michael Sars" in April - May 1984 in the Barents Sea between 71°30'N - 76°00'N and between 16°30'e 35°30 'E. The report also decribes the ... -
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
(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". ... -
Report from the 2nd Meeting of the ICES Study Group on Zooplankton Production [Las Palmas, 8- 11 March, 1993]
(ICES CM Documents;1993/L:11, Working paper, 1993) -
Report of the Blue Whiting Assessment Working Group [Vigo, Spain, 8- 14 September, 1994]
(ICES CM Documents;1995/Assess:7, Working paper, 1995) -
Report of the ICES Study Group on Zooplankton Production [Bergen, 23- 26 March, 1992]
(ICES CM Documents;1992/L:5, Working paper, 1992) -
Report of the Working Group on Fisheries Acoustic Science and Technology [Hamburg, 18- 19 April, 1997]
(ICES CM Documents;1997/B:5, Working paper, 1997) -
Report of the Working Group on Phytoplankton Ecology (WGPE) [19- 21 February, 2004, Gijón, Spain]
(ICES CM Documents;2004/C:1, Working paper, 2004) -
Report of the Working Group on Phytoplankton Ecology [Büsum, Germany, 24- 26 March, 1997]
(ICES CM Documents;1997/L:5, Working paper, 1997)