Browsing Brage IMR by Subject "VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923"
Now showing items 281-300 of 753
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Nodavirus in farmed Atlantic cod Gadus morhua in Norway
(Journal article; Peer reviewed, 2007-09-14)Viral encephalopathy and retinopathy (VER) was diagnosed in 5 to 24 g sized farmed Atlantic cod Gadus morhua kept in sea cages at Parisvatn, Hordaland county, on the west coast of Norway. Moderate mortality (10 to 15%) ... -
North Sea herring population structure revealed by microsatellite analysis
(Journal article; Peer reviewed, 2005-11-21)The Atlantic herring Clupea harengus has played a pivotal role in the formulation of ideas relating to population structuring in marine fishes, yet considerable uncertainty remains as to the extent to which phenotypic ... -
Norwegian acoustic survey of North East Arctic cod on the spawning grounds off Lofoten
(ICES CM Documents;1997/Y:18, Working paper, 1997)An acoustic survey of the spawning stock of North East Arctic Cod off Lofoten has been performed annually in March-April since 1982. The estimates for 1985-1997 have been recalculated and mean length and weight at age ... -
Norwegian blue whiting investigation in April/May 1980.
(ICES CM Documents;1980/H:61, Working paper, 1980)An acoustic survey on the blue whiting stock was conducted from 8 April to 14 May 1980. The area west of the British Isles was covered twice and then the area around the Farces and further up to Shetland and the Norwegian ... -
Norwegian investigations in 1984 -1985 on juvenile herring
(ICES CM Documents;1985/H:53, Working paper, 1985)This paper describes tlte Norwegian investigations on juvenile herring (0-, I- and II-group) of the Norwegian spring spawning stock. The investigations were carried out in Norwegian coastal areas and in the Barents Sea ... -
Norwegian investigations on Gonatus fabricii (Lichtenstein)
(ICES CM Documents;1995/K:12, Working paper, 1995)By far the majority of the investigated Gonatus fabricii were caught as bycatch by pelagic trawls fishing in the upper 60 m. Sampling took place in April/May, June/July and August/September in the period 1978- 1991. The ... -
Nytt overvåkingsprogram: Smittespredning mellom oppdrettslaks og villaks
(Havforskningsnytt;Nr. 12 - 2011, Working paper, 2011)Havforskningsinstituttet er i ferd med å etablere et overvåkingsprogram for å evaluere påvirkning av oppdrettsnæringen på sykdomsstatus hos villfisk langs norskekysten. Programmet skal gå fra 2011 til 2015. -
Observations of abundance, stock composition, body size and food of postsmolts of Atlantic salmon in the NE Atlantic during summer
(ICES CM Documents;1996/M:4, Working paper, 1996)Postsmolt Atlantic salmon were caught during pelagic trawl surveys in the Norwegian Sea in July-August, 1991 and 1995, and off the Hebrides in May-June 1995. Using the swept area technique abundance estimates of postmolts ... -
Observations of cod reaction to trawling noise
(Working paper, 1988-04)Observations made from a stationary echo sounder, passed by a trawling vessel, clearly demonstrate the flight reaction of cod as a response to the noise from the vessel. Horizontal dispersal and downward swimming has been ... -
Observing behaviour of over-wintering Herring (Clupea harrengus L.) in Ofoten with Acoustic Current profiler
(ICES CM Documents;2003/Q:6, Working paper, 2003)In this paper we present results and interpretation of velocity and signal strength data collected with a ‘Continental’ Current Profiler on over-wintering herring in the Ofoten in the North of Norway. The instrument was ... -
Occurence and structure of cysts in x-cell lesions of Atlantic cod (Gadus morhua L.)
(ICES CM Documents;1994/E:12, Working paper, 1994)Introduction: Despite numerous investigations the nature and origin of x -cells remain unknown. These ovoid, pale-staining cells with a large, round nucleus and prominent nucleolus are known to occur in the form of ... -
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. ... -
Ocean Acoustic Waveguide Remote Sensing (OAWRS) of marine ecosystems
(Journal article; Peer reviewed, 2009-12-03)Ocean Acoustic Waveguide Remote Sensing (OAWRS) has recently been shown to be capable of instantaneously imaging and continuously monitoring fish populations over continental shelf-scale areas, covering thousands of km2. ... -
Oil-tainting of fish, a laboratory test on salmon and saithe
(ICES CM Documents;1976/E:33, Working paper, 1976) -
Oppdrett av laksefisk i norske kystfarvann: Vibriose
(Fisken og havet - Serie B, Working paper, 1974) -
Osmotic cataract causes reduced vision in wild Atlantic salmon postsmolts
(Journal article; Peer reviewed, 2003-07-08)Osmotic cataracts were diagnosed in all of 191 Atlantic salmon Salmo salar L. postsmolts caught during 8 trawl hauls on the western side of the Vøringsplateau, Norwegian Sea, in June 2001. The changes varied from a hazy ... -
Overview of the EU fair project "STEREO" (Stock effects on recruitment relationships)
(ICES CM Documents;1999/Y:10, Working paper, 1999)The overall objective of the STEREO project is to improve the methodology for determining limit reference points for the biomass of exploited fish stocks. Limit reference points set boundaries which are intended to ... -
Parasitic nematodes in stomachs of grey seals, Halichoerus grypus, and common seals, Phoca vitulina, along the Norwegian coast.
(ICES CM Documents;1984/N:3, Working paper, 1984)The nematode infestation in stomachs of 55 grey and 127 common seals were examined in the period 1976-1980. The seals were caught in Norwegian coastal waters between 62° and 67° North. In 48 adult grey seals the infestation ... -
Parental migration, climate and thermal exposure of larvae: spawning in southern regions gives Northeast Arctic cod a warm start
(Journal article; Peer reviewed, 2011-10-20)Temporal variability in environmental conditions met by early life stages is considered a key driver of fluctuations in recruitment and abundance of fish stocks. Variability in spawning grounds selected by the parental ... -
Pathophysiological effect of chronic and acute stress in Atlantic salmon, Salmo salar (Actinopterygii: Salmoniformes: Salmonidae)
(Journal article; Peer reviewed, 2013-12-01)The knowledge on the effect of different stress factors on Atlantic salmon, Salmo salar Linnaeus, 1758, is far from complete and therefore we decided to find out how the low water level stress could effect pathophysiological ...