Blar i Brage IMR på forfatter "Tilseth, Snorre"
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The behaviour of whiting (Gadus merlangus) in relation to long lines
Fernö, Anders; Tilseth, Snorre; Solemdal, Per (ICES CM Documents;1977/B:44, Working paper, 1977) -
Behaviour studies on fish reaction to long lines
Tilseth, Snorre; Solemdal, Per; Fernö, Anders (ICES CM Documents;1978/B:22, Working paper, 1978)This study is a continuation of a field investigation on the behaviour of fish towards long lines, started in 1976. The present paper gives an analysis of the effect of current and time of the day on the activity of whiting ... -
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 ... -
Changes in buoyancy and activity during starvation of cod larvae (Gadus morhua L. )
Tilseth, Snorre; Strømme, Tore (ICES CM Documents;1976/F:33, Working paper, 1976) -
The distribution of cod larvae and prey organism in the Lofoten area related to critical prey concentration
Tilseth, Snorre (PINRO-IMR Symposium, Conference object, 1984)The distribution of cod larvae and their main prey organisms in the first feeding areas off the Lofoten islands have been studied in sheltered and exposed areas in relation to feeding conditions. These findings are discussed ... -
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 ... -
Effects of low levels of ekofisk crude oil on eggs and yolksac larvae of cod (Gadus morhua L.)
Solberg, Tor Sverre; Tilseth, Snorre; Serigstad, Bjørn; Mangor-Jensen, Anders (ICES CM Documents;1982/E:60, Working paper, 1982) -
Effects of low levels of heavy fraction of ekofisk crude oil on eggs and yolksac larvae of cod (Gadus morhua L.)
Solberg, Tor Sverre; Tilseth, Snorre; Serigstad, Bjørn; Westrheim, Kjell (ICES CM Documents;1982/E:59, Working paper, 1982) -
Enzyme polymorphism expressed in newly hatched cod larvae and genetic analysis of larvae exposed to hydrocarbons.
Jørstad, Knut Eirik; Solberg, Tor Sverre; Tilseth, Snorre (ICES CM Documents;1980/F:22, Working paper, 1980)Cod eggs and larvae, at different stage of development, have been analyzed by starch gel electrophoresis. Four common enzymes (phosphoglucose isomerase, phosphoglucose mutase, isocitrate dehydrogenase and lactate ... -
Fatty acid composition as indicator of food intake in cod larvae (Gadus morhua L.) from Lofoten, northern Norway
Tilseth, Snorre; Klungsøyr, Jarle; Falk-Petersen, Stig; Sargent, J.R. (ICES CM Documents;1987/L:31, Working paper, 1987)The year class strength of the Arcto-Norwegian cod is mainly determined during the early life stages. The mortality is caused both by starvation and predation which are linked to environmental factors during this period. ... -
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 ... -
Field studies on the behaviour of whiting (Gadus merlangus L.) towards baited hooks
Fernö, Anders; Solemdal, Per; Tilseth, Snorre (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1986)The responses of whiting to a test line with baited hooks were studied during three cruises in the Trondheimsfjord area in three seasons. The activity of the fish directed towards the baited hooks increased at sunrise ... -
Fish behaviour in relation to long lines observed by TV
Fernö, Anders; Johannessen, Arne; Olsen, Kjell; Solemdal, Per; Tilseth, Snorre; Valdemarsen, John Willy (ICES CM Documents;1976/B:38, Working paper, 1976) -
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 ... -
Fullskala havbeiteforsøk - laks, torsk, røye og hummer : Orientering om Fiskeridepartementes havbeiteprogram
Tilseth, Snorre (Nordiske seminar- og arbejdsrapporter;1991:504, Conference object, 1991) -
Growth, energy consumption and prey density requirements in first feeding larvae of cod (Gadus morhua L.). In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
Solberg, Tor Sverre; Tilseth, Snorre (Flødevigen rapportserie, Conference object, 1984)Growth, oxygen uptake, swimming activity, feeding ability and energy content were investigated in cod larvae from several groups under different experimental conditions. At yolk absorption the larvae consumed 0.090-0.120 ... -
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) -
Methods for testing smell response in fish
Tilseth, Snorre; Solemdal, Per (ICES CM Documents;1977/B:45, Working paper, 1977) -
Primary growth increments in otoliths of cod larvae (Gadus morhua L.) of the Arcto-Norwegian cod stock
Gjøsæter, Harald; Tilseth, Snorre (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1982)Primary growth increments have been detected in the otoliths of wild-caught, first-feeding cod larvae, living in a habitat where the light intensity is above the light threshold for visual feeding during 24 hours, and ... -
Primary growth increments in otoliths of cod larvae (Gadus morhua L.) of the Arcto-Norwegian cod stock
Gjøsæter, Harald; Tilseth, Snorre (ICES CM Documents;1981/G:54, Working paper, 1981)Primary growth increments are laid down in the otoliths of cod larvae living in a habitat where the light intensity is above the light threshold for visual feeding during 24 hours, and in which the larvae were observed to ...