Browsing ICES CM documents authored by IMR scientists (1949-2011) by Subject "sild"
Now showing items 81-100 of 265
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Herring larvae survey in the Skagerrak, Autumn 1966
(ICES CM Documents;1967/H:27, Working paper, 1967) -
How and why acoustic detectability and catchability of herring change with individual motivation and physiological state in a variable environment: a multi-scale study on a local herring population in southwestern Norway
(ICES CM documents, Working paper, 2006)The understanding of distribution and aggregation in herring (Clupea harengus) can be enhanced by integrated multi-scale studies in small ecosystems. Hydro-acoustics, underwater cameras, herring and predator gillnet samples ... -
How many trawl hauls, and how many fish from each haul are needed to obtain a given precision in the age structure estimate for Norwegian spring spawning herring? A bootstrap approach
(ICES CM documents, Working paper, 2006)The Norwegian spring spawning herring is assessed each year from acoustic surveys. The age structure in the stock is estimated from trawl samples. Typically, about 10 trawl samples are taken per survey, and 100 fish from ... -
ICES symposium on herring stocks 1977
(ICES CM Documents;1975/H:55, Working paper, 1975) -
ICES Working Group on the Bløden Tagging Experiment : Report on the Meeting at Charlottenlund 29 March to 2 April 1971
(ICES CM Documents;1971/H:3, Working paper, 1971) -
Ichthyophonus hoferi disease in the herring in Norwegian waters
(ICES CM Documents;1992/H:27, Working paper, 1992)After the discovery of I. hoferi disease in Norwegian spring spawning herring in summer 1991, a program for systematic surveillance of the disease in the herring in Norwegian waters was developed. The programme, which ... -
Influence of sea temperature on herring distribution and migration in the Norwegian Sea in April 1997
(ICES CM Documents;1999/M:3, Working paper, 1999)After spawning at the west coast of Norway, the Norwegian spring spawning herring migrates northwestwards into the Norwegian Sea to feed in early April. The herring enters areas with distinct oceanographic features both ... -
Inter-calibration of participating vessels in the ICES coordinated surveys of North Sea herring
(ICES CM Documents;1998/OPEN:23, Working paper, 1998)Summary: Three pairwise acoustic inter-calibrations of the performance of EK500 scientific echosounders were carried out in July 1997. The first inter-calibration was carried out at about 57 40'N by OE by GO Sars and ... -
Interim report of the North Sea herring assessment working group
(ICES CM Documents;1972/H:2, Working paper, 1972) -
Investigations on the 1983 year-class of Norwegian spring-spawning herring
(ICES CM Documents;1984/H:39, Working paper, 1984) -
Killer whales (Orcinus orca L.) and saithe (Pollachius virens L.) trap herring (Clupea harengus L.) in shallow water by taking advantage of steep bottom topography
(ICES CM Documents;2002/N:20, Working paper, 2002)Whales and fish use a wide range of hunting tactics in order to catch their prey. Predatorprey interactions have been seen during the massive wintering of herring (Clupea harengus) in steep bottomed topography in Lofoten, ... -
Length and age at maturity of Norwegian spring-spawning herring for the year-classes 1959 -61 and 1973 -78
(ICES CM Documents;1986/H:42, Working paper, 1986)The age and length at maturity is calculated for the six year-classes, 1973-78. The age at maturity is also calculated for the year-classes 1959-61. The two periods are caracterized by great differences in stock abundance ... -
Maturation characteristics in Norwegian spring-spawning herring before, during, and after a major population collapse
(ICES CM documents, Working paper, 2002)The immense Norwegian spring-spawning herring (Clupea harengus) population collapsed to the state of commercial extinction in the late 1960s, probably largely due to overfishing; the stock has fully recovered since the ... -
Measurements of the density coefficient and average target strength of herring using purse seine.
(ICES CM Documents;1982/B:33, Working paper, 1982)Integrator values were obtained from a school of herring. The fish density of this school was determined on the basis of a purse seine catch. From these values a conversion factor and average target strength for herring ... -
Migration behaviour of herring along the cold front in the Norwegian Sea in April 1997
(ICES CM Documents;1997/EE:12, Working paper, 1997)The behaviour of Norwegian spring spawning herring when migrating to the feeding areas in the Norwegian Sea in April was mapped by an acoustic survey in 1997. The distribution of herring was recorded by conventional echo ... -
Migration behaviour of Norwegian spring spawning herring when entering the cold front in the Norwegian Sea
(ICES CM Documents;1996/H:13, Working paper, 1996)The distribution of Norwegian spring spawning herring when migrating to the feeding areas in the Norwegian Sea in spring has been mapped by surveys in April1995 and 1996. The schooling behaviour of the herring have been ... -
Migrations and stock size of herring in the northern North Sea in 1966; analyses of Norwegian tagging experiments
(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, ... -
Modelling herring target strength pressure dependence in the frequency domain
(ICES CM documents, Working paper, 2001)Improved understanding of the acoustic scattering properties of the fish is needed when trying to remove potential bias is acoustic abundance estimates. The paper address the problem of systematic pressure or depth dependency ... -
Mortality of herring during the larval stage
(ICES CM Documents;1968/Sy:4, Working paper, 1968) -
Mortality of North Sea herring that is crowded and subsequently slipped from a purse seine
(ICES CM documents;2009/M:16, Working paper, 2009)Catch regulation by slipping whole or parts of the catch has traditionally been used in NE-Atlantic purse seine fisheries for pelagic species if the catches are considered too big or the quality or size of the fish is ...