Blar i ICES CM documents authored by IMR scientists (1949-2011) på forfatter "Tjelmeland, Sigurd"
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A quest for management objectives – case study on the Barents Sea Capelin
Røttingen, Ingolf; Tjelmeland, Sigurd (ICES CM documents;2008/O:08, Working paper, 2008)The Barents Sea capelin is a short lived arctic pelagic species and a shared Norwegian-Russian stock. Although the management objectives for Barents Sea capelin have not been explicitly stated, the management authorities ... -
Cod Consume Capelin
Johannesen, Edda; Johansen, Geir Odd; Bogstad, Bjarte; Mehl, Sigbjørn; Tjelmeland, Sigurd; Dolgov, Andrey V. (Working paper, 2006) -
Estimating initial stomach content using stochastic simulation
Tjelmeland, Sigurd; Alvarez, Jaime (ICES CM Documents;1994/G:16, Working paper, 1994)The stomach evacuation model now in use when quantifying the predation from cod on Barents Sea capelin assumes that the evacuation rate is dependent on the stomach fullness after the last meal, which is not known in the ... -
Estimation of predation mortalities on capelin using a cod - capelin model for the Barents Sea
Bogstad, Bjarte; Tjelmeland, Sigurd (ICES CM Documents;1990/H:16, Working paper, 1990)The Barents Sea capelin stock collapsed during the period 1983-1986. One of the main factors causing the collapse was a rapid increase in consumption of capelin by cod. Based on measurements of stomach evacuation rates ... -
Spatial and temporal patterns in recruitment of shrimp Pandalus borealis in the Barents Sea
Aschan, Michaela; Ådlandsvik, Bjørn; Tjelmeland, Sigurd (ICES CM documents, Working paper, 2000)The shrimp spawn in autumn and the eggs are carried as out roe by the females until spring when the larvae hatch. Within a period of 2-3 months the shrimp larvae settle to the bottom. Today’s assessment and forecast of ... -
Sustainable yield estimates of the Barents sea capelig stock
Hamre, Johannes; Tjelmeland, Sigurd (ICES CM Documents;1982/H:45, Working paper, 1982)The Barents Sea capelin suffer mass mortality after spawning. A model is developed to calculate the biomass of springspawners using previous autumn acoustic survey estimates of the total stock as input data. It is assumed ... -
The killing of the north-east Atlantic plankton feeders: Man the murderer or accessory to the crime?
Glukov, A.; Hamre, Johannes; Tjelmeland, Sigurd (ICES CM Documents;1988/H:59, Working paper, 1988) -
The predation of cod on capelin 1983 -1988
Mehl, Sigbjørn; Sunnanå, Knut; Tjelmeland, Sigurd (ICES CM Documents;1988/G:55, Working paper, 1988) -
Towards an MSY-based management of Barents Sea capelin in an ecosystem context
Røttingen, Ingolf; Tjelmeland, Sigurd (ICES CM documents;2009/R:07, Working paper, 2009) -
The use of Medium-Term Forecasts in advice and management decisions for the stock of Norwegian spring spawning herring (Clupea harengus L.)
Bogstad, Bjarte; Røttingen, Ingolf; Sandberg, Per; Tjelmeland, Sigurd (ICES CM documents, Working paper, 2000)Medium-term simulations on the stock development of Norwegian spring-spawning herring (Clupea harengus L.) have been carried out since 1994 by the ICES «Atlanto-Scandian Herring and Capelin Working Group», in 1996 renamed ...