Browsing ICES CM documents authored by IMR scientists (1949-2011) by Author "Soldal, Aud Vold"
Now showing items 1-14 of 14
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A new radio link telemetry positioning system, experiences from tracking of fish and crustaceans
Bjordal, Åsmund; Engås, Arill; Soldal, Aud Vold; Øvredal, Jan Tore (ICES CM Documents;1993/B:23, Working paper, 1993)Telemetry positioning systems based on hydrophone arrays have been used for different tracking applications. The main improvement of this new system is the wire-less transmission of signals from hydrophone - radio buoys ... -
Avoidance reactions of ultrasonic tagged cod during bottom trawling in shallow water
Engås, Arill; Soldal, Aud Vold; Øvredal, Jan Tore (ICES CM Documents;1991/B:41, Working paper, 1991)Introduction: Observations made by echo sounder (Ona 1988) have shown that cod (Gadus morhua L.) may avoid an approaching survey vessel horizontally and vertically. However, there has been a lack of information on the ... -
Catch comparison between rockhoppers and bobbins ground gear on the Norwegian bottom sampling trawl
Engås, Arill; Jacobsen, Jan Arge; Soldal, Aud Vold (ICES CM Documents;1988/B:31, Working paper, 1988)In a study aimed at improving the reliability of the Norwegian bottom sampling trawl, comparative fishing between standard bobbins gear and rockhopper ground gear were carried out in the Barents Sea. The catch ratios ... -
Diurnal changes in bottom trawl catches and vertical fish distribution
Engås, Arill; Jacobsen, Jan Arge; Soldal, Aud Vold (ICES CM Documents;1988/B:32, Working paper, 1988)Bottom sampling trawl catches and acoustic abundance estimates of North-East Arctic cod and haddock in the Barents Sea were collected and examined according to time of day. The trawl catches were at average larger by day ... -
Effects of fishing strategy on relative selectivity in trawls, longline and gillnets
Huse, Irene; Løkkeborg, Svein; Soldal, Aud Vold (ICES CM Documents;1996/B:23, Working paper, 1996)Exploitation of fish stocks is dependent on effort, catchability, the selectivity of the gear used, and the fishermen's choice of time and place. A full-scale fishing experiment was conducted in February 1996 at the coast ... -
Evidence of sampling induced biases in mortality estimates from experiments investigating mortality in fish escaping from towed fishing gears
Breen, Mike; Sangster, Graham; O’Neill, Barry; Kynoch, Rob; Jones, Emma; Soldal, Aud Vold (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 ... -
Evidence of sampling induced biases in mortality estimates from experiments investigating mortality in fish escaping from towed fishing gears
Breen, Mike; Sangster, Graham; O’Neill, Barry; Kynoch, Rob; Jones, Emma; Soldal, Aud Vold (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 ... -
Mortality and injuries of haddock (Melanogrammus aeglefinus) that are caught by pelagic longline
Huse, Irene; Soldal, Aud Vold (ICES CM documents, Working paper, 2002)By-catches of haddock (Melanogrammus aeglefinus) below legal size (44 cm total length) in the seasonal pelagic longline fisheries for haddock off the coast of Finnmark, northern Norway, are often high. The small fish are ... -
Mortality and injuries of haddock, cod and saithe escaping through codend meshes and sorting grids
Ingolfsson, Olafur; Soldal, Aud Vold; Huse, Irene (ICES CM documents, Working paper, 2002)Mortalities and injuries of the gadoids haddock (Melanogrammus aeglefinus L.), cod (Gadus morhua L.) and saithe (Pollachius virens L.) were studied after codend and grid escapement in two full scale trials in 2000 and 2001 ... -
Oil production structures in the North Sea as fish aggregating devices
Brønstad, Oddvar; Humborstad, Odd-Børre; Jørgensen, Terje; Løkkeborg, Svein; Svellingen, Ingvald; Soldal, Aud Vold (ICES CM documents, Working paper, 1998)The paper deals with a study aimed at investigating whether underwater structures from decommissioned oil platforms in the North Sea can be used as artificial fish reefs or protection habitats for fish. The experimental ... -
Scale damage and survival of cod and haddock escaping from a demersal trawl
Soldal, Aud Vold; Isaksen, Bjørnar; Marteinsson, Jon Einar; Engås, Arill (ICES CM Documents;1991/B:44, Working paper, 1991)Cod (Gadus morhua L.) and haddock (Melanogrammus aeglefinus L.) escaping through the meshes of a cod-end (135 mm diamond meshes) or through a metal grid sorting device mounted in the foremost part of the cod-end, were ... -
Selection and mortality in pelagic longline fisheries for haddock
Soldal, Aud Vold; Huse, Irene (ICES CM documents, Working paper, 1997)The bycatch of haddock (Melanogrammus aeglefinus) below legal size in the pelagic longline fisheries for haddock off the coast of Finnmark, northern Norway, is often high. This project was aimed at reducing the bycatch of ... -
The use of transplantation-tagging-experiments in studies of migratory diversity of cod off Norway
Godø, Olav Rune; Korsbrekke, Knut; Soldal, Aud Vold; Totland, Atle (ICES CM Documents;1994/Mini:12, Working paper, 1994)Cod along the Norwegian coast show great variability in migration. Coastal Cod may be stationary for the whole life while mature Northeast Arctic Cod migrate long distances to reach the feeding areas in the Barents Sea ... -
Vulnerability to predation of small cod (Gadus morhua) that escape from a trawl
Løkkeborg, Svein; Soldal, Aud Vold (ICES CM Documents;1995/B:15, Working paper, 1995)Studies of the vulnerability to gear damage of fish that have been caught in a trawl but have escaped through the codend meshes have focussed on determining survival rates. This study examines the risk of predation in ...