Blar i ICES CM documents authored by IMR scientists (1949-2011) på tittel
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Distribution, drift and condition of herring larvae off western Norway in 1987
(ICES CM Documents;1988/H:14, Working paper, 1988)Introduction: After 1959 the Norwegian spring-spawning herring have been spawning along the western coast of Norway north of 62° N. During the sixties the stock was reduced to a minimum. In the recent years there has ... -
Diurnal changes in bottom trawl catches and vertical fish distribution
(ICES CM Documents;1988/B:32, Working paper, 1988)Bottom sampling trawl catches and acoustic abundance estimates of North-East Arctic cod and haddock in the Barents Sea were collected and examined according to time of day. The trawl catches were at average larger by day ... -
Diurnal variation in acoustic densities: why do we se less in the dark?
(ICES CM Documents;2004/R:33, Working paper, 2004)Introduction: In the Barents Sea, the echo abundance of demersal fish is about 50% higher at day than at night. Three possible reasons are: • Fish hide in the bottom dead zone at night. • Fish target strength changes due ... -
Diurnal variation in bottom trawl survey catches: does it pay to adjust?
(ICES CM Documents;2001/Q:11, Working paper, 2001)We have studied the diurnal bias of bottom trawl survey catches with the purpose of adjusting for it and thereby improving the accuracy of abundance estimates. The correction term is estimated with uncertainty, and thus ... -
Diurnal variation in frequency response of gadoids in the Barents Sea
(ICES CM documents, Working paper, 2006)Earlier studies have demonstrated substantial diurnal variation in acoustic abundance of fish. Both the level and the uncertainty of abundance estimates from surveys carried out around the clock are affected. It has been ... -
Diurnal variation models of bottom trawl survey catches parameterised by using commercial CPUE data
(ICES CM Documents;2004/R:41, Working paper, 2004)Introduction: Diurnal variation is observed in almost all marine surveys and can cause biased abundance and length frequency estimates. Symmetric logistic models developed by Hjellvik et al. (2001) were utilized to ... -
Diurnal variations in acoustic density measurements of wintering Norwegian spring spawning herring
(ICES CM Documents;1995/B:12, Working paper, 1995)Survey data from six herring assesment cruises in the wintering areas for spring spawning Norwegian herring were analysed with regard to variation in abundance and depth with time of day. The data were quite consistant ... -
Diving observations on Barents Sea capelin at its spawning grounds off the coast of northern Norway
(ICES CM Documents;1971/H:25, Working paper, 1971) -
Do capelin larvae deposit daily increments in their otoliths?
(ICES CM documents, Working paper, 2004)Analysis of increment formation in larval fish otoliths has provided valuable information about growth, transport and mortality processes of larvae in wild stocks, but the technique has not been widely used on capelin ... -
Do Different Methods Provide Accurate Probability Statements in the Short Term?
(ICES CM documents, Working paper, 2000)The performance of uncertainty estimation procedures was evaluated with respect to accuracy. A confidence statement is said to be accurate if the confidence point achieves the desired probability coverage. A Monte Carlo ... -
Do two-year-old Arcto-Norwegian cod remain in the area where they settled?
(ICES CM documents, Working paper, 2001) -
Draft Report of the Sub-Committee for Automatic Data Processing
(ICES CM Documents;1966/N:26, Working paper, 1966) -
Dramatic changes in spawning stock age-structure of Barents Sea cod
(ICES CM documents, Working paper, 2004)Atlantic Cod (Gadus morhua) is one of the commercially most important fish species in the North Atlantic and plays a central role in several ecosystems. Fishing pressure has been heavy over a prolonged period and the ... -
Drift of capelin larvae - a population sink?
(ICES CM Documents;1988/H:54, Working paper, 1988) -
The Drupa oil spill, investigation concerning oil, water and fish
(ICES CM Documents;1976/E:34, Working paper, 1976) -
Dynamics in frequency of skipped reproduction in Norwegian spring-spawning herring
(ICES CM documents, Working paper, 2004)A common presumption in fisheries science is that adult iteroparous fish, once matured, typically spawn in all consecutive years. Recent evidence suggests, however, that skipping of reproduction occurs more commonly than ... -
Dynamics of maturation in long-lived fish populations. II. Norwegian spring spawning herring
(ICES CM Documents;1993/H:20, Working paper, 1993) -
Dynamics of moving masses: Variability in packing density and shape among pelagic schools
(ICES CM Documents;1990/B:40, Working paper, 1990)The packing density and external shape of herring, saithe and sprat schools in the North Sea and along the Norwegian coast are measured acoustically. The packing density was inversely. related to the fish size, but species ... -
Dynamics of wintering Norwegian spring-spawning herring at the entrance to Tysfjorden, December 1996
(ICES CM Documents;1997/CC:16, Working paper, 1997)The entrance region to Tysfjorden was acoustically surveyed a total of eleven times during the December 1996 abundance survey of the spawning stock of Norwegian spring-spawning herring (Clupea harengus). The observations ... -
Early development of Northeast Arctic greenland halibut (Reinhardtius hippoglossoides)
(ICES CM Documents;1998/O:27, Working paper, 1998)The early development of the Greenland halibut (Reinhardtius hippoglossoides) has never been described in detail. This study contains some preliminary notes on the egg development of the Northeast Arctic Greenland halibut ...