Browsing Brage IMR by Author "Opstad, Ingegjerd"

A comparison of egg quality and larval viability between cultured coastal cod and wild arcto-norwegian cod

Solemdal, Per; Kjesbu, Olav Sigurd; Opstad, Ingegjerd; Skiftesvik, Anne Berit; Birkeland, R.; Bratland, Per; Fonn, Merete (ICES CM documents;1991/F:41;, Working paper, 1991)

Experiments on cod eggs revealed an inverse relationship between egg diameter and mortality. Further, larvae hatching from small eggs showed a redeuced feeding ability. Other methods to characterice larval viability ...

Effects of continuous flow rate on development and mortality of halibut yolk sac larvae

Opstad, Ingegjerd; Bergh, Øivind (ICES CM Documents;1990/F:41, Working paper, 1990)

Halibut (Hippoglossus hippoglossus L.) yolk sac larvae were raised in incubators with different rates of continuous flow. Most larvae died between Days 10 and 29 after hatching. Rate of mortality increased with increasing ...

Effects of light on the development, activity and mortality of halibut (Hippoglossus hippoglossus L.) yolk sac larvae

Skiftesvik, Anne Berit; Opstad, Ingegjerd; Bergh, Øivind; Pittman, Karin; Skjolddal, Lillian (ICES CM Documents;1990/F:43, Working paper, 1990)

Halibut yolk sac larvae were kept at different light intensities from Day 1 posthatch. Measurements of activity and swimming speed showed that larvae that were kept in darkness were more active, but had lower swimming ...

Endocrine and nutritional factors affecting the first food uptake by cod larvae

Huse, Ingvar; Walther, Bernt; Opstad, Ingegjerd; Klungsøyr, Leiv (ICES CM Documents;1982/F:17, Working paper, 1982)

Hyse kan bli ny oppdrettsart

Opstad, Ingegjerd (Havforskningsnytt, Working paper, 2001)

Intensive production of cod fry at Austevoll. Final report.

Huse, Ingvar; Jensen, Per Anders; Opstad, Ingegjerd; Otterå, Håkon; Strand, Bernt (ICES CM Documents;1984/F:33, Working paper, 1984)

The experiences of this final season of the intensive cod fry production experiment are summed up. The brood stock yielded 369 liters of cod eggs. The production experiment in plastic pens had very high survival, but ...

Intensive production of cod fry systems and results so far

Huse, Ingvar; Opstad, Ingegjerd; Jensen, Per Anders (ICES CM Documents;1983/F:24, Working paper, 1983)

Kyst og havbruk 2009

Agnalt, Ann-Lisbeth; Bakketeig, Ingunn; Haug, Tore; Knutsen, Jan Atle; Opstad, Ingegjerd (Fisken og havet, særnummer, Research report, 2009-04)

La fiskelarvene bestemme!

Skiftesvik, Anne Berit; Holm, Jens Christian; Bergh, Øivind; Opstad, Ingegjerd; Pittman, Karin (Havforskningsnytt, Working paper, 1991)

Physical stress on halibut larvae

Opstad, Ingegjerd; Raae, Arnt J. (ICES CM Documents;1986/F:18, Working paper, 1986)

Halibut larvae were exposed to physical stress in the form of different levels of airation. Survival rate, development, dry weight, RNA, DNA and protein were measured. At the end of the experiment the larvae exposed to ...

Preliminary report on the effects of temperature on the development of eggs and larvae of halibut (Hippoglossus hippoglossus) and on the bacterial population in the incubators

Bergh, Øivind; Opstad, Ingegjerd; Pittman, Karin; Skiftesvik, Anne Berit; Skjolddal, Lillian; Strand, Hans Kristian; Vanthuyne, Virginie (ICES CM Documents;1989/F:19, Working paper, 1989)

Eggs were stripped from one female of the halibut broodstock at Austevoll Aquaculture Station, and fertilised with sperm from two males immediately before incubation. Eggs were held in nine open-circulation 250 l incubators ...

Present status of an intensive cod-rearing experiment at Austevoll, Norway

Huse, Ingvar; Lohne Gokstad, Svanhild; Grav, Torfinn; Jensen, Per Anders; Kristiansen, Arve; Opstad, Ingegjerd (ICES CM Documents;1982/F:16, Working paper, 1982)

Size of spawning Arcto-Norwegian cod (Gadus morhua L.) and the effects on their eggs and early larvae

Solemdal, Per; Bergh, Øivind; Dahle, Geir; Falk-Petersen, Inger-Britt; Fyhn, Hans Jørgen; Grahl-Nielsen, Otto; Haaland, J.M.; Kjesbu, Olav Sigurd; Løken, Sissel; Opstad, Ingegjerd; Pedersen, Torstein; Skiftesvik, Anne Berit; Thorsen, Anders (ICES CM Documents;1993/G:41, Working paper, 1993)

Using a new method for determining the stage of spawning in batch spawners, a positive correlation between the length of Arcto-Norwegian cod females, having spawned 25-75% of their eggs, and the egg diameter was established. ...

Steril fisk – løsningen på rømmingsproblemet : Sterile fish – the solution to the problem of escapees?

Hansen, Tom; Opstad, Ingegjerd; Haugen, Trine; Fjelldal, Per Gunnar; Taranger, Geir Lasse (Havforskningsnytt, Working paper, 2009)

Both the authorities and fish farmers are currently working hard to make it more difficult for fish to escape from cages. However, we know that it will hardly be possible to prevent all escapes. The best way of guaranteeing ...

The effects of maternal status of Arcto-Norwegian cod on egg quality and vitality of early larvae. 2. Preliminary results of the experiment in 1992

Solemdal, Per; Bergh, Øivind; Finn, Roderick Nigel; Fyhn, Hans Jørgen; Grahl-Nielsen, Otto; Homme, O.; Kjesbu, Olav Sigurd; Kjørsvik, Elin; Opstad, Ingegjerd; Skiftesvik, Anne Berit (ICES CM Documents;1992/G:79, Working paper, 1992)

The stage of spawning of females of the Arcto-Norwegian cod caught during peak spawning in Lofoten had a profound effect on several vital parameters of the eggs and larvae. Significant negative correlations were ...