Blar i ICES CM documents authored by IMR scientists (1949-2011) på forfatter "Toresen, Reidar"
-
1994 ICES coordinated acoustic survey of ICES Divisions IVa, IVb, VIa and VIIb
Simmonds, E. John; Toresen, Reidar; Corten, A.; Pedersen, Jan Per; Reid, David; Fernandes, Paul G. (ICES CM Documents;1995/H:15, Working paper, 1995)Summary: Six surveys were carried out during late June and July covering most of the continental shelf North of 54°N in the North Sea and Ireland to the west of Scotland to a northern limit of 62°N. The eastern edge of ... -
1995 ICES coordinated acoustic survey of ICES Divisions IVa, IVb, VIa and VIIb
Simmonds, E. John; Toresen, Reidar; Corten, A.; Pedersen, Jan Per; Reid, David; Fernandes, Paul G.; Hammer, Cornelius (ICES CM Documents;1996/H:8, Working paper, 1996)Summary: Seven surveys were carried out during late June and July covering most of the continental shelf North of 54°N in the North Sea and Ireland to the west of Scotland to a northern limit of 62°N. The eastern edge ... -
1996 ICES coordinated acoustic survey of ICES Divisions IIIa, IVa, IVb and VIa
Simmonds, E. John; Bailey, David M.; Toresen, Reidar; Couperus, Bram; Pedersen, Jan Per; Reid, David; Fernandes, Paul G.; Hammer, Cornelius (ICES CM Documents;1997/H:11, Working paper, 1997)Summary: Seven surveys were carried out during late June and July covering most of the continental shelf north of 54°N in the North Sea and lreland to the west of Scotland to a northern limit of 62°N. The eastern edge of ... -
1997 ICES coordinated acoustic survey of ICES Division IIIa, IVa, IVb and VIa
Simmonds, E. John; Bailey, M.C.; Toresen, Reidar; Torstensen, Else; Couperus, Bram; Pedersen, Jan Per; Reid, David; Hammer, Cornelius (ICES CM Documents;1998/OPEN:22, Working paper, 1998)Summary: Six surveys were carried out during late June and july covering most of the continental shelf north of 54°N in the North Sea and lreland to the west of Scotland to a northern limit of 62°N. The eastern edge of ... -
1999 ICES coordinated acoustic survey of ICES Divisions IIIa, IVa, IVb and VIa
Simmonds, E. John; Toresen, Reidar; Torstensen, Else; Zimmermann, Christopher; Götze, Eberhard; Reid, David; Couperus, Bram (ICES CM Documents;2000/K:39, Working paper, 2000)Five surveys were carried out during late June and July covering most of the continental shelf north of 54°N in the North Sea and Ireland to the west of Scotland to a northern limit of 62°N. The eastern edge of the survey ... -
Absorption of acoustic energy in dense herring schools studied by the attenuation in the bottom echo signal
Toresen, Reidar (ICES CM Documents;1990/B:2, Working paper, 1990)The absorption of acoustic energy in herring schools is studied by echo integration of the bottom signal under various densities of herring. The investigations were carried out in a fjord in northern Norway, where large ... -
Avoidance reactions of herring to a survey vessel, studied by scanning sonar
Ona, Egil; Toresen, Reidar (ICES CM Documents;1988/H:46, Working paper, 1988)The behavioural response of a shallow herring layer to a steaming vessel has been studied by the use of a high-resolution scanning sonar technique. When the vessel was completely darkened, no significant reaction important ... -
The effects of a minimum landings size regulation in the fishery of Norwegian spring-spawning herring
Hamre, Johannes; Toresen, Reidar (ICES CM Documents;1986/H:51, Working paper, 1986)Effects of minimum landing size (LC) in the fishery of Norwegian spring-spawning herring have been investigated. The herring is assumed to be a unit stock, in which the growth of immatures differs according to the ... -
Explotation and state of stock
Hamre, Johannes; Toresen, Reidar (ICES CM Documents;1988/H:57, Working paper, 1988) -
Growth in the Norwegian spring-spawning herring for the year-classes 1950 -1960 and 1973 -1983
Toresen, Reidar (ICES CM Documents;1988/H:35, Working paper, 1988)Two periods with great differences in year-class abundance and recruitment where chosen for growth studies. In the first period the mean year-class strength at 3 years was 6 790 x 10[6] individuals while in the second ... -
Inter-calibration of participating vessels in the ICES coordinated surveys of North Sea herring
Simmonds, E. John; Toresen, Reidar; Pedersen, Jan Per; Götze, Eberhard (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 ... -
Length and age at maturity of Norwegian spring-spawning herring for the year-classes 1959 -61 and 1973 -78
Toresen, Reidar (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 ... -
Predation on the eggs of Norwegian spring-spawning herring at a spawning ground outside the westcoast of Norway in 1981
Toresen, Reidar (ICES CM Documents;1985/H:55, Working paper, 1985)Predation on the eggs of demersal spawners has been reported several times, and findings of haddock feeding on capelin or herring eggs is a well known phenomenon. A spawning ground where spawning has been detected through ... -
Reactions of herring to trawling noise
Ona, Egil; Toresen, Reidar (ICES CM Documents;1988/B:36, Working paper, 1988)The reaction of herring during pelagic trawl sampling has been studied by use of a high-frequency scanning sonar mounted on the headline of the trawl. The difficulties of obtaining high catch rates on shallow herring ... -
Recruitment indices of Norwegian spring-spawning herring for the period 1965 -1984 based on the international 0-group fish surveys
Toresen, Reidar (ICES CM Documents;1985/H:54, Working paper, 1985)The trawl data from the International 0-group fish surveys in the Barents Sea are analyzed. The fishing powers of the participating vessels are estimated and corrected for. A relative index of year class strength is ... -
Return of Norwegian spring spawning herring (Clupea harengus L.) to historical spawning grounds off southwestern Norway
Bergstad, Odd Aksel; Røttingen, Ingolf; Toresen, Reidar; Johannessen, Arne; Dragesund, Olav (ICES CM Documents;1991/H:24, Working paper, 1991)From the mid-1940s to mid-1960s a northward displacement of the spawning areas of the Norwegian Spring Spawning Herring was observed. Further retraction of the population from traditional feeding and spawning grounds ...