Blar i ICES CM documents authored by IMR scientists (1949-2011) på forfatter "Misund, Ole Arve"
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A PC-based echo integrator system appliable for school structure analyzis
Floen, Svein; Totland, Bjørn; Øvredal, Jan Tore; Misund, Ole Arve (ICES CM Documents;1991/B:43, Working paper, 1991)A low cost system for integration of echo signals on a PC has been developed. The system calculates the area backscattering strength in surface and bottom layers, and is designed both for the purpose of conventional ... -
Abundance estimation of schools using a fisheries sonar
Misund, Ole Arve; Floen, Svein (ICES CM Documents;1991/B:35, Working paper, 1991)An attempt of abundance estimation of fish schooling close to surface using sonar was conducted in Eastern North Sea - Skagerrak in September 1990. The method is based on measurements of the school area by the Furuno ... -
Acoustic measurements of schooling herring. Estimation of school biomass and target strength
Misund, Ole Arve; Øvredal, Jan Tore (ICES CM Documents;1988/B:26, Working paper, 1988)The connections between reflected echo energy and dimensions of fatty herring schools were studied by a combination of multibeam sonar and a calibrated echo integration unit. A relation between the area and the biomass ... -
An intership sonar calibration experiment in the Norwegian Sea
Misund, Ole Arve; Jakupsstovu, Stein Hjalti (ICES CM Documents;1996/B:22, Working paper, 1996)When migrating in the Norwegian Sea in spring and summertime, the Norwegian spring spawning herring will be surveyed by vessels from four nations. Because the herring may occur in schools close to the surface, use of ... -
Await in the pelagic: herring compromising reproduction and survival within a vertically split school
Axelsen, Bjørn Erik; Misund, Ole Arve; Fernö, Anders; Nøttestad, Leif; Johannessen, Arne (ICES CM documents, Working paper, 1998) -
Behaviour of Norwegian spring spawning herring in relation to underwater light
Beltestad, Arvid K.; Misund, Ole Arve (ICES CM Documents;1988/B:24, Working paper, 1988)The Norwegian coastal purse seiners, with shallow nets, have experienced difficulties in catching the herring due to their natura! behaviour being located too deep during day time and toe scattered during night time. ... -
Characteristics of sardinella aggregations in Angolan waters
Dalen, John; Misund, Ole Arve; Luyeye, Nkosi; Boyer, D.; Coetzee, Janet; Cloete, Rudi; Oechslin, Gerhard (ICES CM documents, Working paper, 1998) -
Computerbased detection of schools for counting, quantification of size and swimming behavior by the SIMRAD SA950 sonar
Totland, Bjørn; Misund, Ole Arve (ICES CM Documents;1993/B:17, Working paper, 1993)As a help in stock assessment of pelagic, schooling fish a software for detection of schools and quantification of their size and swimming behaviour by a high resolution sonar has been developed. The system reads the ... -
Distribution and behavioural dynamics of ocean feeding Norwegian spring spawning herring: observations across spatio-temporal scales
Misund, Ole Arve; Nøttestad, Leif; Mackinson, Steven; Guenette, Sylvie; Pitcher, Tony; Fernö, Anders (ICES CM documents, Working paper, 1998) -
Dynamics of moving masses: Variability in packing density and shape among pelagic schools
Misund, Ole Arve (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 ... -
Grid-sorting of penned saithe
Misund, Ole Arve; Skeide, Roar L. (ICES CM Documents;1992/B:11, Working paper, 1992)Size selection of penned saithe was obtained by forcing the fish against an adjustable grid mounted in the end of net pens. The size selection was rather sharp, with a selection range of about 5 cm only. All fish forced ... -
Influence of sea temperature on herring distribution and migration in the Norwegian Sea in April 1997
Nøttestad, Leif; Misund, Ole Arve; Orvik, Kjell Arild; Ulvestad, Bente Hoddevik (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 ... -
Mapping the migration pattern of schooling fish by use of multi-beam sonar during conventional acoustic surveys
Hafsteinsson, M.T.; Misund, Ole Arve (ICES CM Documents;1994/Mini:9, Working paper, 1994)Information on migration pattern and swimming behaviour of pelagic fish schools in the vicinity of steaming survey vessels has been collected by a multi-beam sonar system connected to an external device for data collection ... -
Migration behaviour of herring along the cold front in the Norwegian Sea in April 1997
Misund, Ole Arve; Fernö, Anders; Guenette, Sylvie; Mackinson, Steven; Melle, Webjørn; Nøttestad, Leif; Slotte, Aril (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
Misund, Ole Arve; Melle, Webjørn; Fernö, Anders (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 ... -
On subjectivity in the judging of acoustic records; comparison of degree of homogenity in allocation of echo values by different teams
Korsbrekke, Knut; Misund, Ole Arve (ICES CM Documents;1993/B:21, Working paper, 1993)On four fish abundance estimation surveys in the Barents Sea, january-february 1993, the acoustic records were judged by two independent teams. We have analyzed the degree of homogenity in allocation of echo values to ... -
On the shape, size and density of North Sea herring schools as mapped by echo integration and accurate sonar projection
Misund, Ole Arve; Aglen, Asgeir (ICES CM Documents;1993/B:16, Working paper, 1993)The shape and horizontal extent of herring schools in the North Sea have been mapped by a naval sonar (SIMRAD SA 950) with narrow horizontal beam width. The density of schools that were passed over was measured by the ... -
Optimization of purse seines by large meshed sections and low lead weight. Theoretical considerations, sinking speed measurements and fishing trials.
Beltestad, Arvid K.; Misund, Ole Arve (ICES CM Documents;1988/B:25, Working paper, 1988)Theoretical considerations on material requirements and sinking speed by use of different mesh size and lead weight in purse seines are outlined. Measurements confirmed that the sinking speed varied with mesh size and ... -
Position prediction of herring schools in purse-seine capture situations
Misund, Ole Arve (ICES CM Documents;1987/B:10, Working paper, 1987)Sonar observations of herring schools in the North Sea and along the Norwegian Coast reveal a rather constant swimming behaviour of individual schools in purse-seine capture situations. On the basis of this a method for ... -
Predation of oyster larvae by Aurelia aurita in a Norwegian oyster pond
Aase, Hans; Misund, Ole Arve; Pedersen, Torstein (ICES CM Documents;1986/F:21, Working paper, 1986)In the norwegian oyster spatting ponds several factors may influence the spat production. During a basic, general study in a pond in 1983-84, Aurelia aurita was demonstrated to be a heavy predator on pelagic oyster ...