Browsing ICES CM documents authored by IMR scientists (1949-2011) by Subject "VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925"
Now showing items 521-540 of 550
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Survival of mackerel and saithe escaping through sorting grids in purse seines
(ICES CM Documents;1996/B:24, Working paper, 1996)Technology for efficient size-selection of mackerel and saithe in purse seines has been developed. A critical constraint for application of the technology is the survival of escaping fish. We have conducted a series of ... -
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 experiments on artificially reared 0-group coastal cod (Gadus morhua L.) in western Norway - results from the releases in 1984
(ICES CM Documents;1987/F:25, Working paper, 1987)In November - December 1984, 8,038 seven to eight month old pond or basin reared cod fry were tagged and released in Heimarkspollen, a landlocked fjord in western Norway. The aim of this study was to investigate ... -
Testing various geostatistical models to combine bottom trawl catches and acoustic data
(ICES CM Documents;2004/R:28, Working paper, 2004)The aim of the CATEFA project is to combine information on demersal fish stock abundance from acoustic and bottom trawl surveys. While acoustic data are collected continuously while the research ship is underway, it is ... -
The Barents Sea capelin 1983 -1988
(ICES CM Documents;1988/H:52, Working paper, 1988) -
The capelin fishery 1972 -1988
(ICES CM Documents;1988/H:55, Working paper, 1988) -
The choice of TAC when faced with multiple objectives
(ICES CM Documents;1996/P:15, Working paper, 1996)The total allowable catch is a key instrument in fishery management, and advice on its level used to be based purely on biology. In 1991, ACFM stated that its objective was to provide the advice necessary to maintain ... -
The development of a new gillnet fishery for anglerfish (Lophius piscatorius) in Norwegian waters
(ICES CM Documents;1995/G:12, Working paper, 1995)In autumn 1992 a direct gillnet fishery for anglerfish (Lophius piscatorius) started on the continental shelf off the northwestern coast of Norway. The anglerfish had previously only been taken as bycatch in trawls and ... -
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 measurement error of marine survey catches: the bottom trawl case
(ICES CM Documents;2001/P:6, Working paper, 2001)We have formulated a model for analyzing the measurement error of marine survey abundance estimates using data from parallel surveys (trawl haul or acoustic measurement). The measurement error is defined as the component ... -
The Norwegian groundfish survey at Bear island and west-Spitsbergen in the autumn 1981.
(ICES CM Documents;1982/G: 42, Working paper, 1982) -
The Norwegian spring-spawning herring prior to 1970 [Life history]
(ICES CM Documents;1988/H:56, Working paper, 1988) -
The probability of cod (Gadus morhua) and ling (Molva molva) to encounter gillnets based on in situ fish movements
(ICES CM Documents;1997/W:17, Working paper, 1997)The probability of cod (Gadus morhua) and ling (Molva molva) to encounter a fleet of four gillnets (110m) set within a fixed survey area of 600x600 m2 and soaked for a period of 12 h (1800-0600 hrs) is calculated on the ... -
The squid Todarodes sagittatus (Lamarck) distribution and biology in northern waters August 1982 - June 1983
(ICES CM Documents;1983/K:7, Working paper, 1983) -
The squid Todarodes sagittatus (Lamarck) investigations in Norwegian coastal and bank waters, July 1983 -January 1984, and west of the British Isles, March -April 1984.
(ICES CM Documents;1984/K:20, Working paper, 1984)During the second half of 1983 Todarodes sagittatus invaded the coast of Norway to the same extent as in 1982. Materials for investigation were obtained from research cruises near Shetland in July, on the Viking Bank ... -
The use of data storage tags to study cod natural behaviour and availability to abundance surveys in the Barents Sea
(ICES CM Documents;1997/W:18, Working paper, 1997)Vertical movements of fish stocks can be studied by means of acoustic data from surveys, and diurnal related cycles in behaviour is often reported. To what extent the movements observed by this method reflect behaviour ... -
Timely evaluation of stock status based on scientific surveys, an update
(ICES CM documents, Working paper, 2006) -
Tracking changes in the ling and tusk populations using CPUE estimates from logbook data
(ICES CM documents, Conference object, 2006)