Browsing Brage IMR by Author "Ellertsen, Bjørnar"
Now showing items 1-20 of 31
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A case study on the distribution of cod larvae and availability of prey organisms in relation to physical processes in Lofoten. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
Ellertsen, Bjørnar; Fossum, Petter; Solemdal, Per; Sundby, Svein; Tilseth, Snorre (Flødevigen rapportserie, Conference object, 1984)The distribution of cod larvae and copepod nauplii off the Lofoten islands was studied in the years 1979-82. The highest concentrations of cod larvae and copepod nauplii were found in the Austnesfjord, Hølla-Henningsvær ... -
The 'critical period' concept - a century of recruitment research
Ellertsen, Bjørnar; Fossum, Petter; Solemdal, Per; Sundby, Svein (Others, 1995-11-23) -
Cruise report [19/7 - 15/8, 1996]
Monstad, Terje; Ellertsen, Bjørnar; Holst, Jens Christian ([Toktrapport/Havforskningsinstituttet];, Working paper, 1996) -
Cruise report [30/6 - 29/7, 1998]
Monstad, Terje; Dommasnes, Are; Ellertsen, Bjørnar; Melle, Webjørn ([Toktrapport/Havforskningsinstituttet];, Working paper, 1998-08-08) -
The effect of biological and physical factors on the survival of Arcto-Norwegian cod and the influence on recruitment variability
Ellertsen, Bjørnar; Fossum, Petter; Solemdal, Per; Sundby, Svein; Tilseth, Snorre (PINRO-IMR Symposium, Conference object, 1987)Data from egg and larval field investigations h the Lofoten area are used together with long time series of data on temperature and zooplankton in Lofoten and abundance indices of Arcto-Norwegian cod. The importance ... -
Feeding and vertical distribution of cod larvae in relation to availability of prey organisms
Ellertsen, Bjørnar; Solemdal, Per; Sundby, Svein; Tilseth, Snorre; Westgård, Trond; Øiestad, Victor (Conference object, 1979)The year-class strength of the Arcto-Norwegian cod stock varies on an annual basis by a factor of about 20:1 and is determined at the 0-group stage (about 1/2 year old cod). Since the number of eggs spawned far exceeds the ... -
Food and feeding conditions and prey selectivity of herring (Clupea harengus) through its feeding migrations from Costal areas of Norway to the Atlantic and Arctic watermasses of the Nordic Seas
Dalpadado, Padmini; Dommasnes, Are; Ellertsen, Bjørnar; Melle, Webjørn (ICES CM documents, Working paper, 1998) -
Food and feeding conditions of herring Clupea harengus in the Norwegian Sea
Dalpadado, Padmini; Melle, Webjørn; Ellertsen, Bjørnar; Dommasnes, Are (ICES CM Documents;1996/L:20, Working paper, 1996)The feeding ecology of herring was studied using samples collected during cruises in 1994 and 1995. Investigations were carried out in the Møre shelf region off western Norway where the major spawning of herring occurs, ... -
Food consumption rate and gut evacuation processes of first feeding cod larvae In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
Tilseth, Snorre; Ellertsen, Bjørnar (Flødevigen rapportserie, Conference object, 1984)Laboratory experiments with cod larvae (Gadus morhua L.) during optimum feeding conditions showed that cod larvae were sporadic feeders rather than continuous feeders. Digestion rate of copepod nauplii was less than 30 ... -
The influence of light and food density on the feeding success in larvae of cod (Gadus morhua L.); field and laboratory observations
Ellertsen, Bjørnar; Moksness, Erlend; Solemdal, Per; Strømme, Tore; Tilseth, Snorre; Øiestad, Victor (ICES CM Documents;1976/F:34, Working paper, 1976) -
Kopepodnauplier på Møre våren 1986 - næringstilbudet til sildelarver [HELP 11]
Ellertsen, Bjørnar (help, Research report, 1987)Kopepodnauplier inngår som en viktig del av næringen til sildelarver. På den bakgrunn ble det våren 1986 foretatt en undersøkelse over forekomsten av nauplier i forhold til sildelarver på Møre. Kopepodnauplier og ... -
"Lodda på sommerbeite" . Feltobservasjoner i 1979 og 1980
Ellertsen, Bjørnar; Loeng, Harald; Rey, Francisco; Tjelmeland, Sigurd (Fisken og havet, Research report, 1981)The Institute of Marine Research has, since 1979, carried out investigations on the capelin feeding conditions in the Barents Sea during the summer season. This program is aimed at obtaining data that can contribute to ... -
Miljørapport for 1991
Ellertsen, Bjørnar (Fisken og havet, særnummer;1991:2, Research report, 1991-04) -
Plankton biomass, production and variability in the Norwegian Sea ecosystem
Melle, Webjørn; Rey, Francisco; Ellertsen, Bjørnar; Skjoldal, Hein Rune (ICES CM documents, Working paper, 2004) -
Regional dynamics of Calanus in the Norwegian Sea in response to ocean climate in 1997
Slagstad, Dag; Tande, Kurt; Melle, Webjørn; Ellertsen, Bjørnar; Carlotti, Francois (ICES CM Documents;2000/M:20, Working paper, 2000)A coupled 3D hydrodynamic and ecological model has been set up for the Norwegian Sea (i.e. SINMOD). The hydrodynamic model uses the z-coordinates in the vertical direction. The horizontal grid point distance is 6.67 km ... -
Sampling fish larvae with large pumps; quantitative and qualitative comparisons with traditional gear. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
Solemdal, Per; Ellertsen, Bjørnar (Flødevigen rapportserie, Conference object, 1984)Different types of submersible pump systems, ranging in capacity from 3 to 60 m^3/min, have been tested during the period 1977-83 to collect fish eggs and larvae from discrete depths in the Lofoten area. Comparisons ... -
Sildelarveundersøkelsene i 1988 [HELP 32]
Bjørke, Herman; Ellertsen, Bjørnar; Fossum, Petter; Sætre, Roald (help, Research report, 1990)Denne rapporten gir endel foreløbige resultater fra gytefeltundersøkelsene hos sild i mars-april 1988. Den tar for seg den horisontale og vertikale fordeling av sildelarver i forhold til miljøfaktorene såvel som vekst ... -
Some biological aspects of cod larvae (Gadus morhua L.)
Ellertsen, Bjørnar; Solemdal, Per; Strømme, Tore; Tilseth, Snorre; Westgård, Trond; Moksness, Erlend; Øiestad, Victor (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1980)The development of functional larval stages is described in relation to different yolk sac stages. Morphological and histological work has been done concomitantly with the observation on the larval feeding behaviour. ... -
Spawning strategy and a mechanism for adaptive larval production in Arcto-Norwegian cod
Solemdal, Per; Ellertsen, Bjørnar (ICES CM Documents;1990/L:100, Working paper, 1990)The Arcto-Norwegian cod is spawning in the temperature stable Atlantic water, and the eggs ascend into the more temperature variable coastal water. Changes in time of peak spawning, up to 10 days within the last 60 ... -
A study on survival and growth of fish larvae in a large basin, related to feeding conditions : A preliminary study on herring larvae (Clupea harengus L.) and fry
Ellertsen, Bjørnar; Solemdal, Per; Tilseth, Snorre; Øiestad, Victor (ICES CM Documents;1975/E:44, Working paper, 1975)