Blar i ICES CM documents authored by IMR scientists (1949-2011) på emneord "akustikk"
Viser treff 1-20 av 216
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1992 ICES coordinated acoustic survey of ICES divisions IVa, IVb and VIa
(ICES CM Documents;1993/H:11, Working paper, 1993)This papers provides a report on the combined acoustic survey of herring stocks in the North Sea and ICES Division IVa in July 1992. Surveys by Norway, Scotland and the Netherlands are included covering the period 24 ... -
1993 ICES coordinated acoustic survey of ICES Division IVa, IVb and VIa
(ICES CM Documents;1994/H:22, Working paper, 1994)Summary: This paper provides a report on the combined acoustic survey of herring stocks in the North Sea and ICES division IVaN in June-July 1993. The surveys were carried out by Norway, Scotland, Denmark and Netherlands ... -
1994 ICES coordinated acoustic survey of ICES Divisions IVa, IVb, VIa and VIIb
(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
(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
(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
(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
(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 ... -
2000 ICES coordinated acoustic survey of ICES Division IIIa, IVa, IVb and VIa (North)
(ICES CM Documents;2001/P:28, Working paper, 2001)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 to the west of Scotland to a northern limit of 62°N. The eastern edge of the survey area ... -
A field intercomparison between an acoustic current profiler / ADCP and two Savonius type current meters
(ICES CM Documents;1990/C:30, Working paper, 1990)During an introductory experiment in Lofoten May 1990 data from a vessel mounted ADCP on an anchored research vessel were intercompared with corresponding data from two anchored rotor current meters in a region where the ... -
A PC-based echo integrator system appliable for school structure analyzis
(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 ... -
A stationary acoustic system for monitoring undisturbed and vessel affected fish behaviour
(ICES CM Documents;1996/B:12, Working paper, 1996)Thorough knowledge of the dynamics of natural fish behaviour and distribution within a survey and among surveys is fundamental for reliability of time series of abundance indices. Further, vessel/trawl affected avoidance ... -
Absorption of acoustic energy in dense herring schools studied by the attenuation in the bottom echo signal
(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 ... -
Abundance estimation of pelagic fish stocks by acoustic surveying
(ICES CM Documents;1991/B:33, Working paper, 1991)The echo integration technique is outlined. Weaknesses are identified and remedies described. While the technique is adequate for surveying some stocks, improvements are necessary for its proper application to others. ... -
Acoustic abundance estimate of 0-group north-east Arctic cod and haddock
(ICES CM Documents;1997/BB:15, Working paper, 1997)The abundance of the 1991-1994-year classes of north-east Arctic cod and haddock at the age of six month have been estimated on the basis of Norwegian acoustic data from the International 0-group fish survey in the Barents ... -
Acoustic abundance estimation of the Icelandic stock of capelin : 1978-1982
(Working paper, 1982)During the period October 1978 - february 1982 several abundance estimates and yearclass composition of the Icelandic capelin stock were obtained by acoustic methods. Surveying has been carried out in July-Agust, September, ... -
Acoustic abundance estimation of the stock of Norwegian spring spawning herring, winter 1995- 1996
(ICES CM Documents;1996/H:33, Working paper, 1996)Standard echo integration methodology has been applied to the stock of Norwegian spring spawning herring (Clupea harengus) wintering in the Ofotfjord-Tysfjord-Vestfjord system during late autumn 1995 and early winter ... -
Acoustic abundance estimation of wintering Norwegian spring spawning herring, with emphasis on methodological aspects
(ICES CM Documents;1994/(B+D+G+H):1, Working paper, 1994)The spawning component and part of the juvenile stock of Norwegian spring spawning herring have been wintering in a fjord system in northern Norway in recent years. Conditions for measuring the stock size have been ... -
Acoustic and Bottom Trawl Surveys; How Much Information Do They Provide for Assessing the Northeast Arctic Cod Stock?
(ICES CM documents, Working paper, 1999)Acoustic and bottom trawl surveys of the Northeast Arctic cod stock provide fishery independent estimates of trends in abundance and population characteristics. Given the recent uncertainties in the catch based assessment ... -
Acoustic backscatter from zooplankton and fish explored through an optimized model framework
(ICES CM Documents;2004/R:39, Working paper, 2004)The purpose of this work has been to test complementary methods in order to classify marine organisms, with particularly attention to zooplankton and fish. Algorithms to separate fish and zooplankton have been developed ... -
Acoustic estimates of abundance of 0-group gadoids in the northern North Sea in July 1985
(ICES CM Documents;1986/G:28, Working paper, 1986)This paper presents the results from a joint survey with two research vessels in July 1985. Total estimates of abundance (N x 10-9 ), were: Norway pout 56, haddock 52, whiting 66 and cod 4. Comparisons are made with a ...