Browsing ICES CM documents authored by IMR scientists (1949-2011) by Subject "VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924"
Now showing items 461-480 of 493
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Swivel connected gangions in mechanized longlining - effect on cath rates and operation
(ICES CM Documents;1987/B:18, Working paper, 1987)Multifilament longline with swivel connection between gangions and mainline were compared with traditionally rigged gear on a vessel equipped with a mechanized longline system. The swivel-lines were adapted to the ... -
Synergistic effects of different baits on the same hook in the longline fishery for hake (Merluccius merluccius) and torsk (Brosme brosme)
(ICES CM Documents;1987/B:39, Working paper, 1987)The effects of a combination of different baits on the same hook were tested in two different situations. A bait combination of sardine (Sardina pilchardus) and mackerel (Scomber scombrus) was used to catch hake (Merluccius ... -
Tagging experiment results on cod in western Norway fjord areas
(ICES CM Documents;1986/G:80, Working paper, 1986)During recent years, experiments with large scale release of artificially produced Q-group cod at locations in western Norway waters have been carried out with the aim ofincreaseing the cod catches. As the general ... -
Tagging Experiments on Lobster (Homarus vulgaris L.) in Norway
(ICES CM Documents;1964/152, Working paper, 1964) -
Tagging of Halibut (Hippoglossus vulgaris Fleming) in Norwegian Waters 1956-1959 and at Bear Island 1958
(ICES CM Documents;1959/112, Working paper, 1959) -
Tank observations of prawns and small cod in relation to a moving model trawl
(ICES CM Documents;1976/B:29, Working paper, 1976) -
Test experiments of target strength of herring by comparing density indices obtained by acoustic method and purse seine catches
(ICES CM Documents;1994/B:17, Working paper, 1994)The spawning stock of the Norwegian spring spawning herring has been assessed by acoustic methods using the target strength TS = 20 logL - 71.9 dB (L = mean length of fish) Comparable estimates of fish density were ... -
Testing of a new hook design (E-Z-Baiter) through comparative longline fishing trials
(ICES CM Documents;1986/B:25, Working paper, 1986) -
Testing of a new hook design in the longline fishery for tusk (Brosme brosme) and ling (Molva molva)
(ICES CM Documents;1987/B:20, Working paper, 1987)The EZ-Baiter Circle hook which is a hybrid design between the classical J- and Circle hook shapes, is developed to provide a more effective hook for use in mechanized longline systems. In comparative fishing trials, ... -
The effect of different sweep lengths on length composition of bottom sampling trawl catches
(ICES CM Documents;1987/B:16, Working paper, 1987)Abundance estimates of North-east Arctic cod and haddock are given annually on the basis of combined bottom trawl and acoustic surveys. Both survey methods use data from bottom trawl catches in the calculations. The ... -
The Effect of Gangion Floats on Bait-loss and Catch Rates in Longlining
(ICES CM Documents;1984/B:8, Working paper, 1984)The use of gangion floats will expectedly reduces bait loss and increase catch rates in bottom longlining. Two floats of 5- and 8 g buoyancy are tested through flume tank experiments, underwater observations in the field ... -
The equivalent beam angle and its effective value when applying an integrator threshold
(ICES CM Documents;1987/B:35, Working paper, 1987)In a noise-limited echo integration system, a threshold is applied in order to avoid the contribution from noise. As the signal-to-noise ratio decreases with range, the effective observation volume for small targets is ... -
The post-war evolution of the Norwegian longline fishery for ling and tusk
(ICES CM documents;2011/D:03, Working paper, 2011) -
The use of benthic indicators in Europe: from the Water Framework Directive to the Marine Strategy Framework Directive
(ICES CM documents;2010/H:08, Working paper, 2010) -
The Working Group on Methods of Fish Stock Assessment [Newfoundland, 20- 27 June, 1991]
(ICES CM Documents;1991/Assess:25, Working paper, 1991) -
Tilt angles of schooling penned saithe
(ICES CM Documents;1985/B:26, Working paper, 1985)Saithe (Pollachius virens) of nearly uniform 32 cm length have been photographically observed during the daytime in an apparently free-swimming and schooling state in a pen of dimensions 90 m length, 10 m width, and 7 ... -
Towards a European Marine Ecosystem Observatory (EMECO)
(ICES CM documents;2006/E:10, Working paper, 2006) -
Trawl drag area and netting geometry
(ICES CM Documents;1979/B:26, Working paper, 1979)The bag of a trawlnet is considered as an elliptical cone, its wings as merely forward extensions of this cone. The dimensions of the cone are derived from the measured wingend spread and the headline height (gape) of ... -
Trial of a New, Split-beam Echo Sounder
(ICES CM Documents;1984/B:21, Working paper, 1984)The first at-sea trial of a new, split-beam echo sounder, the SIMRAD ES380 system, is described following a review of the split-beam principle, outline of its realization in hardware and software, and description of ... -
An ultrasonic current meter
(ICES CM Documents;1971/C:24, Working paper, 1971)