Blar i Brage IMR på forfatter "Rørvik, Carl Jakob"
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A stock assessment of lobster (Homarus gammarus) on the Norwegian Skagerrak coast
Tveite, Stein; Rørvik, Carl Jakob (ICES CM Documents;1982/K:7, Working paper, 1982) -
Assessments of the Arcto-Norwegian cod stock : The yield and size of the mature stock versus fishing pattern, fishing effort, natural mortality and mesh size
Hylen, Arvid; Rørvik, Carl Jakob (ICES CM Documents;1975/F:34, Working paper, 1975) -
Bunnfiskundersøkelser i Barentshavet vinteren 1977
Dalen, John; Midttun, Lars; Rørvik, Carl Jakob; Smedstad, Odd M. (Fisken og havet, Research report, 1977)This report describes the results from a survey on demersal fish in the Barents Sea from 16 January to 4 February 1977. The work was carried out by two vessels, R.V. "Johan Hjort" which covered the area from a line along ... -
Bunnfiskundersøkelser ved Bjørnøya og Vest-Spitsbergen høsten 1976
Dalen, John; Rørvik, Carl Jakob; Smedstad, Odd M. (Fisken og havet, Research report, 1977)This report describes the results from a survey with R.V. "G.O. Sars" from 4 October to 8 November on demersal fish in the area of Bear Island and West-Spitsbergen. The most numerous species in the trawl catches were ... -
Distribution and abundance of 0-group Norway pout and haddock in the North Sea july - august 1978
Nakken, Odd; Rørvik, Carl Jakob (ICES CM documents, Working paper, 1979)In order to assess the 0-group abundance of Norway pout and haddock in the North Sea a combined acoustic/trawl survey was carried out in July - August 1978. The 0-group of both species were concentrated in a scattering ... -
Estimating the maturity ogitive for Northeast Arctid cod by a modified assessment model
Hylen, Arvid; Rørvik, Carl Jakob (PINRO-IMR Symposium, Conference object, 1984)The exploitation (1967-77) of the Northeast Arctic cod is splitted in 12 different fisheries. The mesh assessment model is modified in order to estimate the maturity ogive on the basis of the length and the age distributions ... -
Estimating the maturity ogive for northeast- arctic cod by a modified mesh assessment model
Hylen, Arvid; Rørvik, Carl Jakob (ICES CM Documents;1983/G:33, Working paper, 1983) -
Industritrålfisket i Nordsjøen: En studie i hvordan utbyttet kan økes ved hjelp av reguleringer uten at kvoten på torsk, hyse og hvitting overskrides
Rørvik, Carl Jakob (Fisken og havet - Serie B, Working paper, 1977) -
A method for estimating the effective mesh sizes and the effects of changes in gear parameters.
Hoydal, Kjartan; Rørvik, Carl Jakob; Sparre, Per (ICES CM Documents;1980/G:28, Working paper, 1980) -
The Norwegian industrial trawl fishery in the North Sea : a study on how the total catch in 1975 could have been increased without exceeding the quotas of cod, haddock and whiting
Rørvik, Carl Jakob (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1979)Linear programming is used to demonstrate a way to maximise the total catch in a mixed fishery. Constraints are set by quotas, as well as requirements that the total catch should not be too unevenly distributed between ... -
The Norwegian industrial trawl fishery in the North Sea.
Rørvik, Carl Jakob (ICES CM Documents;1978/G:15, Working paper, 1978)Linear programming is used to demonstrate a way to maximise the total catch in a mixed fishery. Constraints are set by quotas, as well as requirements that the total catch should not be too unevenly distributed between ... -
Overlevingsindekser for norsk-arktisk torsk
Rørvik, Carl Jakob (Fisken og havet - Serie B, Working paper, 1979) -
A stock assessment of lobster (Homarus gamarus) on the Norwegian Skagerrak coast
Rørvik, Carl Jakob; Tveite, Stein (Flødevigen rapportserie, Research report, 1982)The lobster stock on the Norwegian Skagerrak coast has become gradually less abundant since early 1950'ies. This is shown by decreasing catch per unit of effort and decreasing numbers according to cohort analysis on ... -
Toktrapport [18/5 - 4/6, 1983]
Randa, Kjell; Rørvik, Carl Jakob ([Toktrapport/Havforskningsinstituttet];, Working paper, 1983) -
Toktrapport [3/10 - 21/10, 1983]
Randa, Kjell; Rørvik, Carl Jakob ([Toktrapport/Havforskningsinstituttet];, Working paper, 1983) -
Toktrapport [Del 1: 2/2 - 3/3, Del 2: 5/3 - 23/3, 1979]
Hylen, Arvid; Midttun, Lars; Dalen, John; Rørvik, Carl Jakob; Smedstad, Odd M. ([Toktrapport/Havforskningsinstituttet];, Working paper, 1979-05-21)