Blar i ICES CM documents authored by IMR scientists (1949-2011) på emneord "trawl"
Viser treff 1-20 av 44
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A preliminary report on the natural occurrence and ecology of Atlantic halibut (Hippoglossus hippoglossus) postlarvae and young immature stages
(ICES CM Documents;1987/F:38, Working paper, 1987)Surveys designed to capture Atlantic halibut, Hippoglossus hippoglossus, postlarvae and young immatures were carried out around Sørøya in North Norway in 1985, 1986 and 1987. Hydrographical conditions and the current ... -
A short note on recent tagging experiments of juvenile Greenland halibut.
(Working paper, 2011) -
Assessing trawl-survey estimates of frequency distributions
(ICES CM Documents;2000/K:23, Working paper, 2000)Marine trawl surveys catch a cluster of fish at each station and fish caught together tend to have more similar characteristics, such as length, age, stomach contents etc., than those in the entire population. When this ... -
Day / night variation in fish directivity in the trawl opening
(ICES CM Documents;1994/B:18, Working paper, 1994)Still photographs of fish in the mouth area of a bottom trawl were taken by a downwards-oriented automated strobe camera mounted near the headrope. Fish angles relative to the towing direction were measured. Fish were ... -
Demersal pair trawling and its operational parameters.
(ICES CM Documents;1982/B:36, Working paper, 1982) -
Determining the entrance position of fish in trawls
(ICES CM documents, Working paper, 1999)The entrance position of a fish is defined as its two-dimensional position in a cross section of a trawl near the centre of the headline. Individual fish entering the trawl: detected by highresolution scanning sonar, ... -
Development of a species-selective trawl for demersal gadoid fisheries
(ICES CM Documents;1995/B+G+H+J+K:1, Working paper, 1995)An experiment was carried out to test a prototype species-selective bottom trawl for separating cod from haddock, secondarily saithe, in the Norwegian commercial roundfish fisheries. A sorting system incorporating a ... -
Effects of trawling and longlining on the yield and biomass of cod stocks - numerically simulated
(ICES CM Documents;1990/G:32, Working paper, 1990)Numerical studies were conducted on the effects of trawl and longline catches on a cod stock and possible yields from it. Five year mean age composition of Pacific cod (Gadus macrocephalus) from the Bering Sea was used ... -
Evidence of sampling induced biases in mortality estimates from experiments investigating mortality in fish escaping from towed fishing gears
(ICES CM Documents;2002/V:25, Working paper, 2002)When studying escapes from trawl codends and other selective devices, the most common method of capturing or ‘sampling’ escaping fish is using a codend cover (Figure 1). This paper will summarise a programme of work providing ... -
First Test Results from the New Norwegian Lidar for Monitoring of Marine Resources
(ICES CM Documents;2004/R:42, Working paper, 2004)Following promising lidar test flights in 2002, Institute of Marine Research (IMR), Bergen in cooperation with NTNU University, Trondheim started the process of designing and building a new lidar to be ready by summer ... -
Holistic evaluation of management policies: What are the consequences of modified gear use on Georges Bank?
(ICES CM documents;2009/ O:26, Working paper, 2009)Georges Bank haddock is a recently recovered fish stock in the New England groundfish fishery. Due to federal constraints under the Magnuson-Steven Act, however, this stock cannot be optimally exploited due to the bycatch ... -
Incorporating experimentally derived estimates of survey trawl catchability into the stock assessment process
(ICES CM Documents;1997/W:5, Working paper, 1997)During the course of the April, 1996, meeting of the Fishing Technology and Fish Behavior Working Group it became clear to many that the methodology for experimentally estimating the catchability of survey trawls might ... -
Local spatial heterogeneity in blue whiting length structure
(ICES CM documents;2007/Q:16, Working paper, 2007)We have used “MultiSampler”, a multiple opening-closing device that allows obtaining several samples from a single trawl haul, during the trawl-acoustic survey targeting blue whiting (Micromesistius poutassou) on their ... -
Norwegian trawl fishery for saithe in the area limited by 62° and 64°N and east of 4°E
(ICES CM Documents;1968/F:13, Working paper, 1968) -
Occurence of blue whiting in trawl catches during surveys from Portugal to Faroe Islands, 1979- 1995
(ICES CM Documents;1996/S:30, Working paper, 1996)Historical data on blue whiting (Micromesistius poutassou) from survey trawl stations of 7 countries, have been congregated and prepared into special files, together with corresponding temperature and salinity observations. ... -
Positive relationships between bottom trawl and acoustic data
(ICES CM documents, Working paper, 2004)Demersal fish stock biomass is usually estimated using commercial landings data, ‘tuned’ by various types of survey data, usually trawl. When collecting fish data by trawl it is only possible to take relatively small numbers ... -
Reactions of herring to trawling noise
(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 ... -
Report from FTFB Subgroup: Evaluation of sources of variability in the fishing power of the GOV trawl
(ICES CM Documents;1992/B:39, Working paper, 1992) -
Report of the Ad hoc Group on Deep-sea Survey (AGDSS)[ 3 March 2011]
(ICES CM documents;2011/ACOM:54, Working paper, 2011)