Browsing Brage IMR by Author "Røttingen, Ingolf"
Now showing items 61-80 of 103
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Principles of the ecosystem approach to fisheries management
Filin, Anatoly; Røttingen, Ingolf (IMR/PINRO Joint Report Series, Conference object, 2005) -
Principles of the ecosystem approach to fisheries management [presentation]
Filin, Anatoly; Røttingen, Ingolf (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
Principles of the ecosystem approach to fisheries management [presentation]
Filin, Anatoly; Røttingen, Ingolf (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
Reappearance of Norwegian spring spawning herring on spawning grounds south of 60°N
Røttingen, Ingolf (ICES CM Documents;1989/H:22, Working paper, 1989)In spring 1989 herring spawned west of Karmøy (near Haugesund) on the Norwegian west coast. Prior to 1945 the coastal areas around Haugesund were among the most important spawning (and fishing) grounds of the Norwegian ... -
Recent migration routes of Norwegian spring spawning herring
Røttingen, Ingolf (ICES CM Documents;1992/H:18, Working paper, 1992)The migration routes of Norwegian spring spawning herring have changed considerably during the last decades. In the 1950s and beginning of the 1960s the stock spawned off the west coast of Norway in late winter, were ... -
Reduced oxygen concentrations in herring wintering areas
Dommasnes, Are; Rey, Francisco; Røttingen, Ingolf (ICES CM Documents;1992/H:16, Working paper, 1992)Since 1987 the major part of the adult Norwegian spring spawning herring stock has been wintering in the Ofotfjord and the Tysfjord, two tributaries to the Vestfjord in northern Norway. The herring enter the fjords in ... -
Relasjoner mellom integrerte ekkointensiteter og fisketetthet
Røttingen, Ingolf (Master thesis, 1975) -
Repeated acoustic surveys on small herring in a fjord area
Ona, Egil; Røttingen, Ingolf (ICES CM Documents;1986/H:70, Working paper, 1986)This paper describes an acoustic survey on small herring in a fjord in Northern Norway which was carried out three times during the same night. The survey speed was 4 knots during two of the survey runs and once 8 ... -
Report of the Planning Group on Surveys on Pelagic Fish in the Norwegian Sea [Bergen, Norway, 28- 30 August, 2002]
Jacobsen, Jan Arge; Gudmundsdottir, Asta; Heino, Mikko; Holst, Jens Christian; Krysov, Alexander; Melle, Webjørn; Mork, Kjell Arne; Røttingen, Ingolf; Tangen, Øyvind; Vilhjálmsson, Hjálmar (ICES CM Documents;2002/D:7, Working paper, 2002) -
Ressursoversikt for 1977 - tillegg : Atlanto-skandisk sild
Hamre, Johannes; Røttingen, Ingolf (Others, 1977) -
Return of Norwegian spring spawning herring (Clupea harengus L.) to historical spawning grounds off southwestern Norway
Bergstad, Odd Aksel; Røttingen, Ingolf; Toresen, Reidar; Johannessen, Arne; Dragesund, Olav (ICES CM Documents;1991/H:24, Working paper, 1991)From the mid-1940s to mid-1960s a northward displacement of the spawning areas of the Norwegian Spring Spawning Herring was observed. Further retraction of the population from traditional feeding and spawning grounds ... -
Silda i Trondheimsfjorden
Røttingen, Ingolf (Havforskningsnytt, Working paper, 2000)Trondheimsfjorden har en egen lokal sildebestand som skiller seg fra andre sildebestander ut ifra biologiske kjennetegn som vekst og alder ved kjønnsmodning m.m. Det er også registrert særskilte genetiske egenskaper for ... -
Silde- og brislingundersøkelser i fjordene, 1.november - 13. desember 1997
Torstensen, Else; Røttingen, Ingolf; Jørstad, Knut Eirik (Fisken og havet, Research report, 1998)Since 1968 selected fjords from Ryfylke to Finnmark have been surveyed acoustically to obtain an indices of abundance of 0-group sprat and Norwegian Spring Spawning Hemng. From 1993 the survey also covers the fjords on ... -
Silde- og brislingundersøkelser i fjordene, 4.november - 16.desember 1999
Torstensen, Else; Røttingen, Ingolf; Røttingen, Jostein (Fisken og havet, Research report, 2000)Rapporten presenterer resultatene fra akustiske undersøkelser i utvalgte kyst-og fjordområder fra svenskegrensen til Finnmark i november-desember 1999. Formålet med undersøkelsen er å fremskaffe mål for utbredelse og ... -
Studies of minke whale (Balaenoptera acutorostrata) ecology in the northeast Atlantic: Description of the 1993 scientific catch operations and preliminary results from stomach analyses and resource surveys
Haug, Tore; Lindstrøm, Ulf; Nilssen, Kjell Tormod; Røttingen, Ingolf (ICES CM Documents;1994/N:14, Working paper, 1994)Ecological studies of the Northeast Atlantic minke whale (Balaenoptera acutorostrata), initiated in 1992, were continued in 1993. The field work was carried out in spring (15 April-15 May), summer (15 June-12 July) and ... -
Swimming speed of spent Norwegian spring spawning herring
Røttingen, Ingolf; Røttingen, Jostein (ICES CM Documents;1991/H:9, Working paper, 1991)In March 1990 spent Norwegian spring spawning herring were tagged on the spawning grounds off Karmøy in southwestern Norway. 37 of these tagged herring were recaptured approximately 40 hours later. The recapture took place ... -
Target strength measurements and acoustic biomass estimation of capelin and 0-group fish
Dalen, John; Raknes, Askjell; Røttingen, Ingolf (ICES CM documents, Working paper, 1976) -
The choice of TAC when faced with multiple objectives
Sandberg, Per; Bogstad, Bjarte; Røttingen, Ingolf; Veim, Anne Kjos (ICES CM Documents;1996/P:15, Working paper, 1996)The total allowable catch is a key instrument in fishery management, and advice on its level used to be based purely on biology. In 1991, ACFM stated that its objective was to provide the advice necessary to maintain ... -
The herring fishery
Hamre, Johannes; Røttingen, Ingolf (ICES CM Documents;1988/H:58, Working paper, 1988) -
The Norwegian spring-spawning herring prior to 1970 [Life history]
Hamre, Johannes; Røttingen, Ingolf (ICES CM Documents;1988/H:56, Working paper, 1988)