Browsing Brage IMR by Author "Ulltang, Øyvind"

A possible reorganization of the assessments in the northern part of the ICES area

Ulltang, Øyvind (ICES CM Documents;1985/Assess:21, Working paper, 1985)

ACFM comments on stock assessment working group reports: A supplement (for working groups) to the ACFM reports of November 1984 and May 1985

Ulltang, Øyvind (ICES CM Documents;1985/Assess:20, Working paper, 1985)

ACFM comments on stock assessment working group reports: A supplement (for working groups) to the ACFM reports of November 1985 and May 1986

Ulltang, Øyvind (ICES CM Documents;1986/Assess:24, Working paper, 1986)

ACFM comments on stock assessment working group reports: A supplement (for working groups) to the ACFM reports of November 1986 and May 1987

Ulltang, Øyvind (ICES CM Documents;1987/Assess:25, Working paper, 1987)

Analyse av fangst pr. enhet innsats data for vågehval. Sluttrapport til NFFR.

Ulltang, Øyvind (Working paper, 1991-06)

Innledning: Fangst pr. enhet innsats (cpue) data fra den norske vågehvalfangsten har tidligere vært analysert ved Havforskningsinstituttet med henblikk på å få et bilde av utviklingen i den nordøstatlantiske bestanden ...

Biology and population dynamics of the Norwegian spring- spawning herring

Dragesund, Olav; Hamre, Johannes; Ulltang, Øyvind (Journal article; Peer reviewed, 1980)

The collapse of the Norwegian spring spawning stock

Dragesund, Olav; Ulltang, Øyvind (ICES CM Documents;1972/H:11, Working paper, 1972)

A comparison of the reliability of acoustic estimates of fish stock abundances and estimates obtained by other assessment methods in the northeast Atlantic

Nakken, Odd; Ulltang, Øyvind (Symposium on Fisheries Acoustics, Bergen, June 21-24, 1982, Conference object, 1982)

The construction of a multi-species model for the Barents Sea with special references to the cod-capelin interactions [fra foredrag på "a workshop on comparative biology, assessment and management of gadoids from the North Pacific and Atlantic oceans" 24-28 June, 1985 Seattle, Washington]

Mehl, Sigbjørn; Nakken, Odd; Tjelmeland, Sigurd; Ulltang, Øyvind (Proceedings: Part III, Conference object, 1986)

Consumption of juvenile herring (Clupea harengus) by cod (Gadus morhua) in the Barents Sea: a new approach to estimating consumption in piscivorous fish

Johansen, Geir Odd; Bogstad, Bjarte; Mehl, Sigbjørn; Ulltang, Øyvind (Journal article; Peer reviewed, 2004)

Consumption of different age groups of juvenile, Norwegian, spring-spawning herring (Clupea harengus) by northeast Arctic cod (Gadus morhua) in the Barents Sea in 1992–1997 is estimated using cod stomach content data. We ...

The effects of regulations of the mackerel fishery in the North Sea

Hamre, Johannes; Ulltang, Øyvind (ICES CM Documents;1972/H:30, Working paper, 1972)

Further studies on stock size fluctuations and rate of exploitation of the Norwegian spring spawning herring, 1950 - 1971

Dragesund, Olav; Ulltang, Øyvind (ICES CM Documents;1973/H:19, Working paper, 1973)

The management of cod stocks with special reference to growth and recruitment overfishing and the question whether artificial propagation can help solve management problems. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983

Ulltang, Øyvind (Flødevigen rapportserie, Conference object, 1984)

The terms qrowth overfishinq and recruitment overfishinq are defined. The exploitation and management of two of the major cod stocks in the North-East Atlantic, North-East Arctic cod and North Sea cod, are briefly ...

Metodeutvikling for bestandestimering av hval. Sluttrapport til NFFR.

Ulltang, Øyvind (Working paper, 1991-06)

Innledning: For å få et bestandsanslag for nordøstatlantisk vågehval har en de siste årene konsentrert seg om å gjennomføre linjetransekttellinger. Det største linjetransekttelletoktet fra norsk side ble gjennomført ...

Migrations and stock size of herring in the northern North Sea in 1966; analyses of Norwegian tagging experiments

Bakken, Erling; Ulltang, Øyvind (ICES CM Documents;1972/H:29, Working paper, 1972)

8000 herring were tagged with internal steel tags in the summer of 1966; 4000 were released in the north-eastern North Sea and 4000 east of Shetland. On the basis of returned tags during the first year after tagging, ...

A model for incorporating changes in distribution of fishing effort in assessment of the effects of changes in trawl mesh size

Ulltang, Øyvind (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1983)

Factors invalidating traditional mesh assessments are discussed with special emphasis on changes in distribution of fishing effort between areas inhabited by small and large fish. A model for studying the effects of such ...